[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 #21 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
I'm trying to understand what to do. What I see from FFMPEG code (assuming I'm
reading it properly), whenever it starts a new frame, it will first go over the
DPB to find all frame with unpaired fields. When one is found, there is two
venue, pair it with the new frame, otherwise it's a lost field, and it must be
concealed. In the software decoder, they copy the previous field of the same
parity, I don't see any concealment on the VAAPI side there.

Is the software FFMPEG decoder method what you had in mind when you say "cache
2 fields" ?

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