[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755072

--- Comment #13 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
> I would like to know if VAAPI can achieve the very same thing. For upstream
> element, like v4l2src, my opinion is that it should always produce DMABuf
> when supported, end of the story. There was a bug with report, with patches,
> but the patches were broken, and was later not updated. I'll see if I can
> make this happen soon.

In the case of the elements that receives dmabufs (encoders and vaapisink) It
looks doable.

In the case of the elements that might push dmabufs (decoder and postproc), it
looks harder, since we don't have a way to figure out what would be "best". The
short-circuit is to enable the io-mode property, which, I guess, we don't want.

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