[Bug 775698] vaapisink: wayland: mutter cannot import surface into a texture

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775698

--- Comment #7 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
The problem is that mutter, in wayland, only imports EGL textures with color
formats RGB and RGBA, but vaapisink asks to import a EGL texture with
EGL_TEXTURE_Y_UV_WL.

As far as I understand, mutter cannot import these textures because COGL cannot
handle them either.

In the case of weston wayland compositor, there is not problems with vaapisink.

My ideal solution would be to add support for this textures in cogl and mutter.

What we can do internally to gstreamer-vaapi? 

1\ reduce the rank of vaapisink
2\ figure out a way to internally convert the NV12 image into RGB.

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