[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

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

--- Comment #41 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
I have pushed to ceyusa/755072 my new branch for dmabuf as downstream buffers
with the algorithm explained above.

It only works for glimgaesink with EGL

GST_GL_PLATFORM=egl gst-play-1.0 sample.mkv --videosink=glimagesink

1\ There is a commit that disables vaapidecodebin because dmabuf is only
negotiated by vaapidecode, but no by vaapipostproc.

2\ Only my Honey 4K media played correctly (with ~7% of cpu usage). The rest my
lower resolution samples are rendered incorrectly, but still don't know why.

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