[Bug 732267] h264parse: extract base stream from MVC or SVC encoded streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=732267

--- Comment #5 from Orestis Floros <orestisf1993 at gmail.com> ---
(In reply to Orestis Floros from comment #4)
> The changes were only tested with the vaapih264dec decoder. This patch won't
> make avdec_h264 work with the base views of MVC / SVC bitstreams because it
> doesn't report supported profiles in it's caps. There are also some problems
> with the *-L0.264 files from the SVC bitstreams because there aren't any
> subset sps units there: base_only is not set to TRUE and the negotiated
> profile is not an SVC one.
> 
> A workaround for both of these issues is to init base_only to TRUE and set
> it to FALSE only when there is a subset sps unit in the bitstream and the
> downstream element supports it's profile. If this method is preferred the
> change should be trivial.

Correction: avdec_h264's issue can be worked around if we set base_only to
FALSE when the downstream element's caps have the "profile" field and the
appropriate profile is included in it.

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