[Bug 796625] vaapipostproc: Bob deinterlace doesn't work for raw file.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796625

--- Comment #11 from U. Artie Eoff <ullysses.a.eoff at intel.com> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #10)
> (In reply to U. Artie Eoff from comment #9)
> > I may be naive, but should "rawvideoparse format=nv12 width=1920 height=1080
> > interlaced=1" output interlaced frames for vaapipostproc?
> 
> It will pretend it's interlaced, but it's not, since the image you provided
> is progressive. Then you selected a BOB deinterlacer, which I believe is the
> only one that won't deteriorate the frame. Also, we aware that you need at
> least 3 fields (2 interleaved frames) in order to use any other algo.

So it determines the raw image data is progressive, how?  As far as
rawvideoparse is concerned, it's just random raw data, right?  And it should
read the data in terms of how the user specifies.  Perhaps it's because the
size of data is not enough for 3 fields?  Oddly, ffmpeg and yami (same vaapi
driver) produce a different result for bob deinterlacer with same input!

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