x264enc: Add format example for option-string

https://bugzilla.gnome.org/show_bug.cgi?id=793879

diff --git a/ext/x264/gstx264enc.c b/ext/x264/gstx264enc.c
index 3d3e0be834d44a522fb90777f42baacfd5a0475c..903dfd17fe60de1fc6789ad1fd878e4e8714aff3 100644 (file)
--- a/ext/x264/gstx264enc.c
+++ b/ext/x264/gstx264enc.c
@@ -930,7 +930,8 @@ gst_x264_enc_class_init (GstX264EncClass * klass)
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, ARG_OPTION_STRING,
       g_param_spec_string ("option-string", "Option string",
-          "String of x264 options (overridden by element properties)",
+          "String of x264 options (overridden by element properties)"
+          " in the format \"key1=value1:key2=value2\".",
           ARG_OPTION_STRING_DEFAULT,
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));