[Bug 796169] vaapidec: Sample video that renders fine with FFMPEG but not in GStreamer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796169

--- Comment #24 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #22)
> One thing to notice is that h264parse will update the caps 13 times, and
> there is 13 parity changes in that stream. Each time, the framerate goes
> from 30000/1001 -> 20000/1001, that means SPS (or selected SPS) have
> changed. So the SPS driven TFF stuff is probably badly broken as it does not
> seem to catch these SPS changes. Maybe it would only work if the SPS change
> is followed by an IDR ?


SEI Buffering period header can also activate the SPS. May it is missing there?
I have seen a lot of SEI headers in the stream, didn't get time to analyze it.

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