matroska: Fix AV1 alignment to TU

Matroska stores AV1 in temporal unit, so that all OBU sharing the same
timestamp are put together. This was previously just assumed, which isn't
safe now that we have more alignments.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1837>

diff --git a/subprojects/gst-plugins-good/gst/matroska/matroska-demux.c b/subprojects/gst-plugins-good/gst/matroska/matroska-demux.c
index ef51dca..64cc6be 100644 (file)
--- a/subprojects/gst-plugins-good/gst/matroska/matroska-demux.c
+++ b/subprojects/gst-plugins-good/gst/matroska/matroska-demux.c
@@ -6621,7 +6621,8 @@ gst_matroska_demux_video_caps (GstMatroskaTrackVideoContext *
       gst_caps_set_simple (caps, "codec-alpha", G_TYPE_BOOLEAN, TRUE, NULL);
     *codec_name = g_strdup_printf ("On2 VP9");
   } else if (!strcmp (codec_id, GST_MATROSKA_CODEC_ID_VIDEO_AV1)) {
-    caps = gst_caps_new_empty_simple ("video/x-av1");
+    caps = gst_caps_new_simple ("video/x-av1",
+        "alignment", G_TYPE_STRING, "tu", NULL);
     if (data) {
       GstBuffer *priv;
 

diff --git a/subprojects/gst-plugins-good/gst/matroska/matroska-mux.c b/subprojects/gst-plugins-good/gst/matroska/matroska-mux.c
index 189f4ee..0147de2 100644 (file)
--- a/subprojects/gst-plugins-good/gst/matroska/matroska-mux.c
+++ b/subprojects/gst-plugins-good/gst/matroska/matroska-mux.c
@@ -146,7 +146,7 @@ static GstStaticPadTemplate videosink_templ =
         "video/x-prores, "
         COMMON_VIDEO_CAPS "; "
         "video/x-wmv, " "wmvversion = (int) [ 1, 3 ], " COMMON_VIDEO_CAPS "; "
-        "video/x-av1, " COMMON_VIDEO_CAPS ";"
+        "video/x-av1, " "alignment = (string) \"tu\", " COMMON_VIDEO_CAPS ";"
         "video/x-ffv, ffversion = (int) 1, " COMMON_VIDEO_CAPS)
     );