docs: Update plugins cache
authorThibault Saunier <tsaunier@igalia.com>
Tue, 9 Jun 2020 19:12:13 +0000 (15:12 -0400)
committerThibault Saunier <tsaunier@igalia.com>
Wed, 10 Jun 2020 14:29:27 +0000 (10:29 -0400)
docs/gst_plugins_cache.json

index 900bf24..a630651 100644 (file)
@@ -36,7 +36,7 @@
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
@@ -50,7 +50,7 @@
                         "default": "63",
                         "max": "64",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
@@ -64,7 +64,7 @@
                         "default": "1",
                         "max": "2147483647",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
@@ -76,7 +76,7 @@
                         "construct-only": false,
                         "controllable": false,
                         "default": "Default",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": false
@@ -88,7 +88,7 @@
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "-1",
                         "max": "16",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "63",
                         "max": "64",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "Default",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "-1",
                         "max": "16",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "16",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "no-dithering (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAASinkDitherers",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "x11 (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAASinkDrivers",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": false
                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": false
                         "default": "1",
                         "max": "5",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "24",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstSample",
                         "writable": false
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "5000000",
                         "max": "9223372036854775807",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "15000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "80",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "255",
                         "min": "-255",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0.35",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.4",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0.3",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "-16777216",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-16711936",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-16711936",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-16761088",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-16744704",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-12632257",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-8421505",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "255",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "no-dithering (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAATvDitherers",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "Standard-vga-8x8-font (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAATvFonts",
                         "writable": true
                         "default": "1",
                         "max": "5",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "24",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "3",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "30",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "4",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAATvRainModes",
                         "writable": true
                         "default": "0.2",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "255",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "80",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "1",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "20",
                         "max": "90",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "100",
                         "max": "128",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "set (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAlphaMethod",
                         "writable": true
                         "default": "2",
                         "max": "64",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "255",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "255",
                         "max": "255",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "255",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "100",
                         "max": "128",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1",
                         "max": "3.40282e+38",
                         "min": "-3.40282e+38",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "clip (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioAmplifyClippingMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "band-pass (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioChebBandMode",
                         "writable": true
                         "default": "4",
                         "max": "32",
                         "min": "4",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.25",
                         "max": "200",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1",
                         "max": "2",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "low-pass (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioChebLimitMode",
                         "writable": true
                         "default": "4",
                         "max": "32",
                         "min": "2",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.25",
                         "max": "200",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1",
                         "max": "2",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "hard-knee (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioDynamicCharacteristics",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "compressor (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioDynamicMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1",
                         "max": "3.40282e+38",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1",
                         "max": "18446744073709551615",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "220",
                         "max": "441",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "100",
                         "max": "100",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "psychoacoustic (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioPanoramaMethod",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "-1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "101",
                         "max": "256000",
                         "min": "3",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "band-pass (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstAudioWSincBandMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
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                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "hamming (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstAudioWSincBandWindow",
                         "writable": true
                         "default": "0",
                         "max": "100000",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "101",
                         "max": "256000",
                         "min": "3",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "low-pass (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstAudioWSincLimitMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "hamming (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstAudioWSincLimitWindow",
                         "writable": true
                         "default": "0.2",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "2.14748e+09",
                         "min": "-2.14748e+09",
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                         "default": "video/x-raw",
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                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "none (49)",
-                        "mutable": "playing",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "min": "-1",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "type": "gboolean",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "type": "guint64",
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                         "default": "25",
                         "max": "2147483647",
                         "min": "0",
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                         "default": "80",
                         "max": "2147483647",
                         "min": "0",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstStructure",
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                         "construct-only": false,
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                         "default": "true",
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                         "max": "2147483647",
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                         "max": "2147483647",
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                         "type": "GstCACATvDithering",
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                         "max": "2147483647",
                         "min": "0",
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                         "max": "18446744073709551615",
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                         "max": "18446744073709551615",
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                         "max": "1.79769e+308",
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                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "maelstrom (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstOpTVMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "16",
                         "max": "2147483647",
                         "min": "-2147483648",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "60",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "16",
                         "max": "64",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "white (3)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRadioacTVColor",
                         "writable": true
                         "default": "3",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "normal (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRadioacTVMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1",
                         "max": "100",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "50",
                         "max": "200",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "6",
                         "max": "100",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "motion-detection (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRippleTVMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": false,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.02",
                         "max": "100",
                         "min": "0.01",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "1.01",
                         "max": "1.1",
                         "min": "1.01",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "12",
                         "min": "-24",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "10",
                         "max": "64",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "4608",
                         "max": "65535",
                         "min": "16",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "default": "8",
                         "max": "32",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "3",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "3",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "32",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "5 (5)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstFlacEncQuality",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "-10",
                         "max": "2147483647",
                         "min": "-2147483647",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer 1.17.0.1 FLV muxer",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer 1.17.0.1 FLV muxer",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "18446744073709551615",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "zero (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAggregatorStartTimeSelection",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "pixels-relative-to-edges (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstGdkPixbufPositioningMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "GdkPixbuf",
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                         "controllable": false,
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "18446744073709551615",
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                         "max": "18446744073709551615",
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-                        "mutable": "playing",
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                         "max": "18446744073709551615",
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                         "max": "9223372036854775807",
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                         "default": "657930",
                         "max": "-1",
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                         "controllable": true,
                         "default": "fade (1)",
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                         "type": "GstAudioVisualizerShader",
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                         "default": "657930",
                         "max": "-1",
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                         "max": "-1",
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                         "max": "18446744073709551615",
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                         "min": "0/1",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "min": "0",
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                         "type": "GtkWidget",
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                         "default": "true",
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                         "max": "-1",
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                         "min": "0",
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                         "min": "0/1",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "min": "0",
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                         "max": "9223372036854775807",
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                         "default": "reorder (1)",
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                         "default": "NULL",
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                         "type": "gchararray",
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                         "default": "0",
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                         "default": "reorder (1)",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "min": "0",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "18446744073709551615",
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                         "construct-only": false,
                         "controllable": false,
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                         "default": "550",
                         "max": "10000",
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                         "default": "0",
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                         "construct-only": false,
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                         "construct-only": false,
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                         "default": "false",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "default": "100",
                         "max": "2147483647",
                         "min": "0",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
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-                        "mutable": "playing",
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                         "type": "GstStructure",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "default": "40000000",
                         "max": "18446744073709551614",
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                         "type": "guint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "default": "200000",
                         "max": "9223372036854775807",
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                         "construct-only": false,
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                         "default": "false",
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                         "construct-only": false,
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                         "default": "NULL",
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                         "type": "GstJackConnect",
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                         "default": "1000000000",
                         "max": "18446744073709551614",
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                         "max": "9223372036854775807",
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                         "construct-only": false,
                         "controllable": false,
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                         "default": "10000",
                         "max": "9223372036854775807",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "default": "NULL",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (1)",
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                         "readable": true,
                         "type": "GstAudioBaseSinkSlaveMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "controllable": false,
                         "default": "(none)",
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                         "type": "GstJackTransport",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
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                         "max": "-1",
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                         "max": "9223372036854775807",
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                         "writable": true
                         "construct-only": false,
                         "controllable": false,
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                         "type": "GstJackConnect",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (2)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioBaseSrcSlaveMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "(none)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstJackTransport",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "ifast (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstIDCTMethod",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "ifast (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstIDCTMethod",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "128",
                         "max": "320",
                         "min": "8",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "standard (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstLameMP3EncEncodingEngineQuality",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4",
                         "max": "9.999",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "quality (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstLameMP3EncTarget",
                         "writable": true
                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "100000000",
                         "max": "18446744073709551615",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "10",
                         "max": "1.79769e+308",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "300000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "30",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "2000000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GDateTime",
                         "writable": true
                         "default": "65535000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "500000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1000000",
                         "max": "1000000000",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "2",
                         "max": "2",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer Matroska muxer",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GDateTime",
                         "writable": true
                         "default": "65535000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "500000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1000000",
                         "max": "1000000000",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "2",
                         "max": "2",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer Matroska muxer",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "30/1",
                         "max": "2147483647/1",
                         "min": "1/1",
-                        "mutable": "playing",
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                         "readable": false,
                         "type": "GstFraction",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "gint",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
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                         "type": "gint",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstSample",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "%%05d",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gchararray",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "type": "guint64",
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                         "default": "18446744073709551615",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "default": "2147483648",
                         "max": "18446744073709551615",
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                         "max": "-1",
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                         "construct-only": false,
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                         "default": "buffer (0)",
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                         "type": "GstMultiFileSinkNext",
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                         "max": "18446744073709551615",
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                         "max": "18446744073709551615",
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-                        "mutable": "playing",
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                         "type": "GstStructure",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "9223372036854775807",
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                         "max": "-1",
                         "min": "0",
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                         "type": "guint",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GstCaps",
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                         "construct-only": false,
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                         "max": "2147483647",
                         "min": "0",
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                         "construct-only": false,
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                         "default": "%%05d",
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                         "type": "gchararray",
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                         "max": "2147483647",
                         "min": "-1",
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                         "max": "2147483647",
                         "min": "0",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "construct-only": false,
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                         "max": "-1",
                         "min": "0",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "construct-only": false,
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                         "type": "gboolean",
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                         "construct-only": false,
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                         "default": "NULL",
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                         "max": "-1",
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                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "default": "0.02",
                         "max": "1",
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-                        "mutable": "playing",
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                         "type": "GstElement",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "mp4mux",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GstStructure",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GstStructure",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "gboolean",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstElement",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "filesink",
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                         "type": "gchararray",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GstStructure",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "ThisRandomString",
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                         "type": "gchararray",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "gboolean",
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                         "default": "40000000",
                         "max": "18446744073709551614",
                         "min": "1",
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                         "type": "guint64",
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                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "max": "9223372036854775807",
                         "min": "1",
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                         "type": "gint64",
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                         "controllable": false,
                         "default": "false",
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                         "controllable": false,
                         "default": "NULL",
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                         "type": "gchararray",
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                         "default": "1000000000",
                         "max": "18446744073709551614",
                         "min": "0",
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                         "type": "guint64",
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                         "max": "9223372036854775807",
                         "min": "1",
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                         "type": "gint64",
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                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstSample",
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                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "default": "false",
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                         "type": "gboolean",
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                         "max": "18446744073709551615",
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                         "default": "false",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "type": "guint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (1)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstAudioBaseSinkSlaveMethod",
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                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
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                         "readable": true,
                         "type": "GstStructure",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
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                         "type": "gint64",
                         "writable": true
                         "default": "1",
                         "max": "10",
                         "min": "0",
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                         "max": "9223372036854775807",
                         "min": "-1",
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                         "max": "9223372036854775807",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "type": "guint",
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                         "default": "200000",
                         "max": "9223372036854775807",
                         "min": "1",
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                         "type": "gint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "type": "gchararray",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
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                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (2)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioBaseSrcSlaveMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "40000000",
                         "max": "18446744073709551614",
                         "min": "1",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "guint",
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                         "default": "200000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
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                         "type": "gint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "/dev/dsp",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "default": "1000000000",
                         "max": "18446744073709551614",
                         "min": "0",
-                        "mutable": "playing",
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                         "default": "40000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "GstSample",
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                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
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                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
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                         "default": "20000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "GstAudioBaseSinkSlaveMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
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                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
-                        "mutable": "playing",
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                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
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                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "default": "200000",
                         "max": "9223372036854775807",
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                         "type": "gint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "/dev/dsp",
-                        "mutable": "playing",
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                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (2)",
-                        "mutable": "playing",
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                         "type": "GstAudioBaseSrcSlaveMethod",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "6",
                         "max": "9",
                         "min": "0",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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-                        "mutable": "playing",
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                         "default": "false",
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                         "default": "40000000",
                         "max": "18446744073709551614",
                         "min": "1",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "guint",
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                         "default": "200000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
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                         "type": "gint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "default": "1000000000",
                         "max": "18446744073709551614",
                         "min": "0",
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                         "default": "40000",
                         "max": "9223372036854775807",
                         "min": "1",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GstSample",
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                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "9223372036854775807",
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                         "controllable": false,
                         "default": "false",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "controllable": false,
                         "default": "NULL",
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                         "controllable": false,
                         "default": "skew (1)",
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                         "type": "GstAudioBaseSinkSlaveMethod",
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                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
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                         "default": "true",
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-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "1",
                         "max": "10",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": false
                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": false
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "200000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "10000",
                         "max": "9223372036854775807",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "skew (2)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstAudioBaseSrcSlaveMethod",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": false
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1",
                         "max": "10",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                 "properties": {
                     "context": {
                         "blurb": "Get OpenGL context",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstGLContext",
                         "writable": false
                     },
                     "qml-scene": {
                         "blurb": "The contents of the QML scene",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "NULL",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                     },
                     "qos": {
                         "blurb": "Handle Quality-of-Service events",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "root-item": {
                         "blurb": "The root QQuickItem from the qml-scene used to render",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "gpointer",
                         "writable": false
                     },
                     "widget": {
                         "blurb": "The QQuickItem to place the input video in the object hierarchy",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "gpointer",
                         "writable": true
                 "properties": {
                     "async": {
                         "blurb": "Go asynchronously to PAUSED",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "blocksize": {
                         "blurb": "Size in bytes to pull per buffer (0 = default)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                     },
                     "enable-last-sample": {
                         "blurb": "Enable the last-sample property",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "force-aspect-ratio": {
                         "blurb": "When enabled, scaling will respect original aspect ratio",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "last-sample": {
                         "blurb": "The last sample received in the sink",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstSample",
                         "writable": false
                     },
                     "max-bitrate": {
                         "blurb": "The maximum bits per second to render (0 = disabled)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                     },
                     "max-lateness": {
                         "blurb": "Maximum number of nanoseconds that a buffer can be late before it is dropped (-1 unlimited)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "5000000",
                         "max": "9223372036854775807",
                         "min": "-1",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                     },
                     "pixel-aspect-ratio": {
                         "blurb": "The pixel aspect ratio of the device",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "0/1",
                         "max": "2147483647/1",
                         "min": "0/1",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstFraction",
                         "writable": true
                     },
                     "processing-deadline": {
                         "blurb": "Maximum processing time for a buffer in nanoseconds",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "15000000",
                         "max": "18446744073709551615",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                     },
                     "qos": {
                         "blurb": "Generate Quality-of-Service events upstream",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "render-delay": {
                         "blurb": "Additional render delay of the sink in nanoseconds",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                     },
                     "show-preroll-frame": {
                         "blurb": "Whether to render video frames during preroll",
+                        "conditionally-available": false,
                         "construct": true,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "stats": {
                         "blurb": "Sink Statistics",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                     },
                     "sync": {
                         "blurb": "Sync on the clock",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "true",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "throttle-time": {
                         "blurb": "The time to keep between rendered buffers (0 = disabled)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                     },
                     "ts-offset": {
                         "blurb": "Timestamp offset in nanoseconds",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                     },
                     "widget": {
                         "blurb": "The QQuickItem to place in the object hierarchy",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "gpointer",
                         "writable": true
                 "properties": {
                     "blocksize": {
                         "blurb": "Size in bytes to read per buffer (-1 = default)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                     },
                     "do-timestamp": {
                         "blurb": "Apply current stream time to buffers",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "false",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "num-buffers": {
                         "blurb": "Number of buffers to output before sending EOS (-1 = unlimited)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                     },
                     "typefind": {
                         "blurb": "Run typefind before negotiating (deprecated, non-functional)",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "false",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "use-default-fbo": {
                         "blurb": "When set it will not create a new FBO for the QML render thread",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
                         "default": "false",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                     },
                     "window": {
                         "blurb": "The QQuickWindow to place in the object hierarchy",
+                        "conditionally-available": false,
                         "construct": false,
                         "construct-only": false,
+                        "controllable": false,
+                        "mutable": "null",
                         "readable": true,
                         "type": "gpointer",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "89",
                         "max": "150",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "60",
                         "min": "-60",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "0",
                         "max": "60",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "60",
                         "min": "-60",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "65535",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "65535",
                         "min": "-1",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
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-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "100",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
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-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "GstStructure",
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                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
-                        "mutable": "playing",
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                         "type": "gint64",
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                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "1400",
                         "max": "-1",
                         "min": "28",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVP9RTPPayMode",
                         "writable": true
                         "default": "96",
                         "max": "127",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "65535",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "65535",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
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                         "type": "gboolean",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-payload-stats, clock-rate=(uint)0, running-time=(guint64)18446744073709551615, seqnum=(uint)0, timestamp=(uint)0, ssrc=(uint)0, pt=(uint)96, seqnum-offset=(uint)0, timestamp-offset=(uint)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "100",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-depayload-stats, clock_rate=(uint)0, npt-start=(guint64)0, npt-stop=(guint64)18446744073709551615, play-speed=(double)1, play-scale=(double)1, running-time-dts=(guint64)18446744073709551615, running-time-pts=(guint64)18446744073709551615, seqnum=(uint)0, timestamp=(uint)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
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                         "default": "10",
                         "max": "2147483647",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "18446744073709551615",
                         "max": "9223372036854775807",
                         "min": "-1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "1400",
                         "max": "-1",
                         "min": "28",
-                        "mutable": "playing",
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                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "96",
                         "max": "127",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
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                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "type": "gint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "65535",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "65535",
                         "min": "-1",
-                        "mutable": "playing",
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                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
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                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-payload-stats, clock-rate=(uint)0, running-time=(guint64)18446744073709551615, seqnum=(uint)0, timestamp=(uint)0, ssrc=(uint)0, pt=(uint)96, seqnum-offset=(uint)0, timestamp-offset=(uint)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": false
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "slave (1)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "RTPJitterBufferMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "200",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "60000",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "2000",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "1000",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "-1",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "3000000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "ntp (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstRtpNtpTimeSource",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "always (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstRTCPSync",
                         "writable": true
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "avp (1)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstRTPProfile",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstStructure",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "max": "2147483647",
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-                        "mutable": "playing",
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                         "max": "9223372036854775807",
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                         "default": "100",
                         "max": "32767",
                         "min": "0",
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                         "default": "0",
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                         "default": "0",
                         "max": "-1",
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                         "default": "0",
                         "max": "1.79769e+308",
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                         "controllable": false,
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                         "type": "RTPSession",
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                         "default": "60000",
                         "max": "-1",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "ntp (0)",
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                         "type": "GstRtpNtpTimeSource",
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                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "max": "1.79769e+308",
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                         "default": "5000000000",
                         "max": "18446744073709551615",
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                         "default": "avp (1)",
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                         "min": "0",
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+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "2000000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "0.05",
                         "max": "1.79769e+308",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "default": "3",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "5000000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "1400",
                         "max": "32767",
                         "min": "16",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "avp (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTPProfile",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-session-stats, rtx-drop-count=(uint)0, sent-nack-count=(uint)0, recv-nack-count=(uint)0, source-stats=(GValueArray)<  >;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": false
                         "default": "60000",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "2000",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "2",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-source-sdes;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "default": "0",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "application/x-rtp-source-stats, ssrc=(uint)0, internal=(boolean)false, validated=(boolean)false, received-bye=(boolean)false, is-csrc=(boolean)false, is-sender=(boolean)false, seqnum-base=(int)-1, clock-rate=(int)-1, octets-sent=(guint64)0, packets-sent=(guint64)0, octets-received=(guint64)0, packets-received=(guint64)0, bytes-received=(guint64)0, bitrate=(guint64)0, packets-lost=(int)0, jitter=(uint)0, sent-pli-count=(uint)0, recv-pli-count=(uint)0, sent-fir-count=(uint)0, recv-fir-count=(uint)0, sent-nack-count=(uint)0, recv-nack-count=(uint)0, recv-packet-rate=(uint)0, have-sr=(boolean)false, sr-ntptime=(guint64)0, sr-rtptime=(uint)0, sr-octet-count=(uint)0, sr-packet-count=(uint)0, sent-rb=(boolean)false, sent-rb-fractionlost=(uint)0, sent-rb-packetslost=(int)0, sent-rb-exthighestseq=(uint)0, sent-rb-jitter=(uint)0, sent-rb-lsr=(uint)0, sent-rb-dlsr=(uint)0, have-rb=(boolean)false, rb-fractionlost=(uint)0, rb-packetslost=(int)0, rb-exthighestseq=(uint)0, rb-jitter=(uint)0, rb-lsr=(uint)0, rb-dlsr=(uint)0, rb-round-trip=(uint)0;",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": false
                         "default": "200",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPBackchannel",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (3)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPSrcBufferMode",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "1-0 (16)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPVersion",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "2000",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "1000",
                         "max": "2147483647",
                         "min": "-1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "3000000000",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "dummy (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPNatMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "ntp (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPSrcNtpTimeSource",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "2",
                         "max": "-1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "tcp+udp-mcast+udp",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstRTSPLowerTrans",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "20",
                         "max": "65535",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "65536",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstStructure",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "20000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "100000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "5000000",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GTlsDatabase",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GTlsInteraction",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "validate-all",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GTlsCertificateFlags",
                         "writable": true
                         "default": "524288",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer/1.17.0.1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "1",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "controllable": false,
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                         "type": "gboolean",
                         "writable": true
                         "default": "15",
                         "max": "3600",
                         "min": "0",
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                         "type": "guint",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GTlsDatabase",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
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                         "type": "GTlsInteraction",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "GStreamer souphttpsrc 1.17.0.1 ",
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                         "default": "128",
                         "max": "1073741824",
                         "min": "2",
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                         "default": "100000000",
                         "max": "18446744073709551615",
                         "min": "1",
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                         "default": "-60",
                         "max": "0",
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                         "type": "gboolean",
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                         "min": "0",
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                         "type": "gint64",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
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                         "type": "gint",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
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                         "default": "3",
                         "max": "2147483647",
                         "min": "0",
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                         "construct-only": false,
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                         "default": "false",
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                         "construct-only": false,
                         "controllable": false,
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                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "readable": true,
                         "type": "gchararray",
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                         "construct-only": false,
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                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (0)",
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                         "readable": true,
                         "type": "GstSpeexEncMode",
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                         "default": "1",
                         "max": "2147483647",
                         "min": "0",
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                         "type": "gboolean",
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                         "default": "8",
                         "max": "10",
                         "min": "0",
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                         "readable": true,
                         "type": "gfloat",
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                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "type": "gint64",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "default": "false",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "3.40282e+38",
                         "min": "-3.40282e+38",
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                         "type": "gfloat",
                         "writable": true
                         "default": "192",
                         "max": "384",
                         "min": "8",
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                         "readable": true,
                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstTwoLameEmphasis",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "joint (1)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstTwoLameMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "never (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstTwoLamePadding",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": true
                         "default": "3",
                         "max": "4",
                         "min": "-1",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "default": "10",
                         "max": "2147483647",
                         "min": "0",
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                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "default": "5",
                         "max": "10",
                         "min": "-10",
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                         "type": "gfloat",
                         "writable": true
                         "default": "0",
                         "max": "384",
                         "min": "0",
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                         "default": "true",
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                         "default": "NULL",
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                         "max": "65535",
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                         "type": "GSocket",
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                         "controllable": false,
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                         "construct-only": false,
                         "controllable": false,
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                         "controllable": false,
                         "default": "udp://0.0.0.0:5004",
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                         "construct-only": false,
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                         "default": "/dev/radio0",
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                         "min": "87500000",
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                         "min": "-2147483648",
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                         "type": "guint",
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                         "construct-only": false,
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                         "default": "/dev/video1",
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                         "default": "(none)",
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                         "type": "GstV4l2DeviceTypeFlags",
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                         "default": "auto (0)",
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                         "controllable": false,
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                         "readable": true,
                         "type": "GstSample",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "type": "guint64",
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                         "max": "9223372036854775807",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
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                         "type": "V4L2_TV_norms",
                         "writable": true
                         "default": "0",
                         "max": "-1",
                         "min": "0",
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                         "max": "2147483647",
                         "min": "-2147483648",
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                         "min": "-2147483648",
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                         "controllable": false,
                         "default": "NULL",
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                         "type": "gchararray",
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                         "max": "18446744073709551615",
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                         "default": "true",
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                         "type": "gboolean",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "controllable": false,
                         "default": "application/x-gst-base-sink-stats, average-rate=(double)0, dropped=(guint64)0, rendered=(guint64)0;",
-                        "mutable": "playing",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "max": "18446744073709551615",
                         "min": "0",
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                         "max": "9223372036854775807",
                         "min": "-9223372036854775808",
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                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "/dev/video0",
-                        "mutable": "playing",
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                         "type": "gchararray",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "construct-only": false,
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                         "default": "false",
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                         "type": "gboolean",
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                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
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                         "type": "GstStructure",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "(none)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstV4l2DeviceTypeFlags",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (0)",
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                         "type": "GstV4l2IOMode",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "none (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "V4L2_TV_norms",
                         "writable": true
                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "type": "gchararray",
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                         "max": "2147483647",
                         "min": "-2147483648",
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                         "default": "false",
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                         "default": "1",
                         "max": "1",
                         "min": "0",
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                         "type": "gdouble",
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                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "default": "1",
                         "max": "1",
                         "min": "0",
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                         "type": "gdouble",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "construct-only": false,
                         "controllable": true,
                         "default": "black (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstVideoBoxFill",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "default": "true",
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                         "type": "gboolean",
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                         "max": "2147483647",
                         "min": "-2147483648",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "-2147483648",
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                         "type": "gint",
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                         "default": "0/1",
                         "max": "2147483647/1",
                         "min": "0/1",
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                         "type": "GstFraction",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "default": "true",
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                         "type": "gboolean",
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                         "default": "1",
                         "max": "10",
                         "min": "0.01",
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                         "default": "true",
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                         "max": "1",
                         "min": "-1",
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                         "max": "2",
                         "min": "0",
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                         "default": "0",
                         "max": "1",
                         "min": "-1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "1",
                         "max": "2",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gdouble",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "none (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVideoFlipMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": true,
                         "default": "identity (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVideoOrientationMethod",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "5 (5)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVideoMedianSize",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "checker (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVideoMixer2Background",
                         "writable": true
                         "default": "4",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "mfqe+demacroblock+deblock",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXDecPostProcessingFlags",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "3",
                         "max": "6",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "3",
                         "max": "3",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.0434",
                         "max": "3.40282e+38",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "4000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "5000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "6000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "-16",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "10",
                         "max": "63",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint64",
                         "writable": true
                         "default": "0",
                         "max": "100",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "vbr (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncEndUsage",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "(none)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncErFlags",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "normal (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncScalingMode",
                         "writable": true
                         "default": "128",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (1)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncKfMode",
                         "writable": true
                         "default": "0",
                         "max": "25",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "63",
                         "max": "63",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "guint64",
                         "writable": true
                         "default": "4",
                         "max": "63",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "multipass.cache",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gchararray",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "one-pass (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncMultipassMode",
                         "writable": true
                         "default": "0",
                         "max": "6",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "100",
                         "max": "1000",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "30",
                         "max": "100",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "60",
                         "max": "100",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "7",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "1",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "256000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "default": "1",
                         "max": "5",
                         "min": "1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "construct": false,
                         "construct-only": false,
                         "controllable": false,
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GValueArray",
                         "writable": true
                         "default": "0",
                         "max": "64",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0/1",
                         "max": "2147483647/1",
                         "min": "0/1",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstFraction",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "1 (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncTokenPartitions",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "psnr (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncTuning",
                         "writable": true
                         "default": "50",
                         "max": "100",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "400",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "100",
                         "max": "1000",
                         "min": "0",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "normal (0)",
-                        "mutable": "playing",
+                        "mutable": "null",
                         "readable": true,
                         "type": "GstVPXEncScalingMode",
                         "writable": true
                         "default": "4",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "mfqe+demacroblock+deblock",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstVPXDecPostProcessingFlags",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "guint",
                         "writable": true
                         "default": "0",
                         "max": "15",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "3",
                         "max": "6",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "3",
                         "max": "3",
                         "min": "1",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gboolean",
                         "writable": true
                         "default": "0.0289",
                         "max": "3.40282e+38",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gfloat",
                         "writable": true
                         "default": "4000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "5000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "6000",
                         "max": "2147483647",
                         "min": "0",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "0",
                         "max": "16",
                         "min": "-16",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "gint",
                         "writable": true
                         "default": "10",
                         "max": "63",
                         "min": "0",
-                        "mutable": "playing",
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                         "min": "0",
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                         "default": "0",
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                         "min": "0",
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                         "controllable": false,
                         "default": "vbr (0)",
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                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "(none)",
-                        "mutable": "playing",
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                         "construct-only": false,
                         "controllable": false,
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-                        "mutable": "playing",
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                         "writable": true
                         "default": "128",
                         "max": "2147483647",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (1)",
-                        "mutable": "playing",
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                         "type": "GstVPXEncKfMode",
                         "writable": true
                         "default": "25",
                         "max": "25",
                         "min": "0",
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                         "max": "2147483647",
                         "min": "0",
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                         "max": "63",
                         "min": "0",
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                         "default": "0",
                         "max": "18446744073709551615",
                         "min": "0",
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                         "default": "0",
                         "max": "63",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "multipass.cache",
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                         "default": "one-pass (0)",
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                         "default": "0",
                         "max": "6",
                         "min": "0",
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                         "min": "0",
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                         "min": "0",
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                         "min": "0",
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                         "default": "256000",
                         "max": "2147483647",
                         "min": "0",
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                         "max": "5",
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                         "default": "0",
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                         "min": "0",
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                         "controllable": false,
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                         "type": "GValueArray",
                         "writable": true
                         "default": "8",
                         "max": "64",
                         "min": "0",
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                         "type": "gint",
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                         "default": "0/1",
                         "max": "2147483647/1",
                         "min": "0/1",
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                         "type": "GstFraction",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "1 (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstVPXEncTokenPartitions",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "psnr (0)",
-                        "mutable": "playing",
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                         "type": "GstVPXEncTuning",
                         "writable": true
                         "default": "50",
                         "max": "100",
                         "min": "0",
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                         "default": "2000",
                         "max": "2147483647",
                         "min": "0",
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                         "default": "0",
                         "max": "2147483647",
                         "min": "0",
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                         "writable": true
                         "default": "25",
                         "max": "1000",
                         "min": "0",
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                         "type": "gint",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "normal (0)",
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                         "type": "GstVPXEncScalingMode",
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                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "default": "0",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "default": "0",
                         "max": "9600000",
                         "min": "0",
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                         "type": "guint",
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                         "default": "0",
                         "max": "24",
                         "min": "0",
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                         "type": "gdouble",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "off (0)",
-                        "mutable": "playing",
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                         "readable": true,
                         "type": "GstWavpackEncCorrectionMode",
                         "writable": true
                         "default": "0",
                         "max": "6",
                         "min": "0",
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                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "auto (0)",
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                         "readable": true,
                         "type": "GstWavpackEncJSMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
-                        "mutable": "playing",
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                         "type": "gboolean",
                         "writable": false
                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "normal (2)",
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                         "type": "GstWavpackEncMode",
                         "writable": true
                         "construct-only": false,
                         "controllable": false,
                         "default": "true",
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                         "type": "gboolean",
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                         "default": "40000000",
                         "max": "9223372036854775807",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "false",
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                         "type": "gboolean",
                         "writable": true
                         "default": "4096",
                         "max": "-1",
                         "min": "0",
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                         "construct-only": false,
                         "controllable": false,
                         "default": "NULL",
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                         "type": "gchararray",
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                         "default": "false",
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                         "max": "2147483647",
                         "min": "0",
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                         "max": "2147483647",
                         "min": "0",
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                         "default": "-1",
                         "max": "2147483647",
                         "min": "-1",
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                         "max": "2147483647",
                         "min": "0",
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                         "max": "2147483647",
                         "min": "0",
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