[Bug 702004] qtdemux: add support for the avc3 sample entry format of the AVC file format

Fri Jun 14 03:17:06 PDT 2013

https://bugzilla.gnome.org/show_bug.cgi?id=702004
  GStreamer | gst-plugins-good | git

--- Comment #12 from A Ashley <bugzilla at ashley-family.net> 2013-06-14 10:17:03 UTC ---
(In reply to comment #10)
> 
> The problem with that is that not everything handling avc1 will be able to
> handle avc3. So there needs to be distinction between the two, and conversion
> support in the parser (like it does for byte-stream<->avc already).

There is a difference between the boxes included in the MP4 file and the
encapsulation of H.264 data within an MDAT box. Both avc1 and avc3 use the same
NAL encapsulation for sample data in the MDAT box.

The h.264 parser downstream of qtdemux will see the same NAL structure for both
avc1 and avc3. The two differences are:
* At the start of a fragment the first sample will have an SPS and PPS in it
* The codec data field will be smaller

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