[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 #16 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #13)
> Ok, sorry, the DPB size aspect was just noise, JM default config increase by
> one the size, I commented that out, and decoding is still clean.
> 
> (In reply to sreerenj from comment #10)
> > Even with the hack, the video still has a bit of shaking. right?
> 
> Right, note that most of the shaking seems to come from the deinterlacer
> (same result from VPP and deinterlace really). I'm not too concern about
> that.
> 
> Great, just need a root cause now ...

I think I know the root cause. It is a bug in interpreting the "missing first
field", due to the wrong assumption based on previous frame field order.

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