[Bug 793678] vaapipostproc: if dmabuf then disable deinterlace

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793678

--- Comment #8 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Soon, Thean Siew from comment #7)
> Based on the discussion here, can I say that flickering issue for
> deinterlacing is basically due to a bug in vaapi-intel-driver or media
> driver, where it would export black dmabuf-based frames and displayed
> directly by glimagesink on screen?

Yes, it might be a problem in the driver: when the VPP deinterlace, when
requesting the second frame from the second field, the dmabuf contains a black
frame, and that's the reason of the flickering when dmabuf is negotiated with
interlaced media.

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