[Bug 793678] vaapipostproc: if dmabuf then disable deinterlace

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #2)
> Review of attachment 368683 [details] [review]:
> 
> Where is the glimagesink patch to support that ? 

It is a missing part indeed.

> Importing into seperate
> EGLImage does not magically deinterlace. You still have half a frame/plane
> in each EGL Image and need to do something if you are rendering to a
> progressive display.

Agreed.

Rethinking the issue, I guess this is a bad option to "hide" a problem with
interlaced streams with dmabuf: in-between black frames.

My options:

1\ keep this and add code in glupload for deinterlacing dmabuf (??)
2\ a bug in vaapi-intel-driver VPP and it could export non-black dmabuf-based
frames when deinterlacing
3\ another workaround: if deinterlacing ignore dmabuf-buf negotiation

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