[Bug 793686] Unneeded BLIT operation when target is encoder (ex: vaapih264enc)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793686

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
As it is hard to tell when the vaapipostproc is used for encoding upstream or
for anything else, I would remove it, but it is not clear to me what would
imply in not encoding use cases, such as EGL textures, where the GstVaapiFilter
is used.

And option would be to add a property to GstVaapiFilter to set the background
color, and set it to zero by default. Only set 0xff000000 when handling EGL
texture or the output color space is alfa (GST_VIDEO_INFO_HAS_ALPHA)

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