[Bug 692942] h264parse: add conversion support from baseline/other profiles to constrained-baseline profile

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692942
  GStreamer | gst-plugins-bad | unspecified

Gwenole Beauchesne <gb.devel> changed:

           What    |Removed                     |Added
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                 CC|                            |gb.devel at gmail.com

--- Comment #3 from Gwenole Beauchesne <gb.devel at gmail.com> 2013-02-08 09:42:18 UTC ---
You cannot always convert from baseline to constrained baseline. Constrained
Baseline profile is Baseline profile without the ASO and FMO madness, which are
hardly supported IMHO. So you cannot randomly convert from Baseline profile to
Constrained Baseline, especially if you use those features. This means you have
to detect ASO (slices not having increasing first_mb_in_slice) and FMO (slice
groups) in the parser.

Besides, the other issue is that h264parse does not support Baseline profile
streams with ASO anyway. i.e. AFAIK, the AU detection logic is very minimal and
just assumes a new AU when first_mb_in_slice is zero again, which is not true
in presence of Baseline profile streams with ASO.

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