[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 #1 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Now I've been tracking the DPB state (some of it) against the short/long_ref
lists, which if I understood well is a bit of duplication, as the DPB is kind
of supposed to be these two list. Anyway, tracing them shows that whenever the
image starts being broken, the short/long ref lists diverged from the dpb, in
fact it becomes larger then the DPB size. Something like this is a recurring
pattern when it breaks:

0:00:28.952788127 31809 0x7f9580013590 INFO                   vaapi
gstvaapidecoder_h264.c:759:dpb_dump: DPB State: 4/4 [ P|66752, P|66760,
P|66748, B|66756, ]
0:00:28.952809735 31809 0x7f9580013590 INFO                   vaapi
gstvaapidecoder_h264.c:780:dpb_dump: Refs State: 8/4 [ P|66752, P|66752,
P|66760, P|66760, P|66748, P|66748, B|66756, B|66756, || ]

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