[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 #26 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
I think the logic in find_first_field() is completly flawed. Nothing really
holds there. We simply match field with different parity, or fill if same. We
should look at the frame_num.

If the frame_num is different then current pic, previous pic is a frame and
only has one field, it's pretty clear a field was lost. Though, I'd need an
explanation of what is the design here. Why can't we just detect missing field
like this, and when recurse to process the actual field that triggered that
detection ?

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