[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 #22 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
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 ?

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