[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 #4 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Ok, I have switch to tracing PicNum, as it seems to make more sense. Then
notice this:

DPB  State: 4/4 [ B|31, P|32, B|33, I|0, ]
Refs State: 3/4 [ B|31, P|32, B|33, || ]
-> fill_picture_first_field_gap_done()
DPB  State: 4/4 [ B|62, P|64, B|66, I|68, ]
Refs State: 8/4 [ B|62, B|63, P|64, P|65, B|66, B|67, I|68, I|69, || ]

So the Refs having less frames actually make sense, some frame came in, but we
don't have all of it yet (so refs having one less frame reflect this). In this
case, it seems we get a lonely I frame field, and then it goes wild.

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