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

[GStreamer (bugzilla.gnome.org)]

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

--- Comment #10 from Sebastian Dröge <slomo at circular-chaos.org> 2013-06-11 16:06:01 UTC ---
(In reply to comment #8)
> (In reply to comment #6)
> > (In reply to comment #5)
> > > Review of attachment 246501 [details] [details] [details]:
> > > 
> > > Maybe this should get a new stream format, "avc3" instead of "avc"?
> > 
> > Especially because this is to be handled completely different to normal AVC
> > (there's no codec_data). So muxers and decoders probably need special handling
> > or conversion. Ideally h264parse would allow to convert between normal AVC and
> > AVC3.
> 
> There is codec_data, but it is only 7 bytes long. It provides the profile and
> level information, but not the SPS or PPS.
> 
> My reason for keeping with the "avc" label for the stream format was to avoid
> having a difference in the file format from propagating further down the parse
> / decode chain.

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).

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