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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from sreerenj <bsreerenj at gmail.com> ---
Yup, intel-vaapi-driver uses BLIT to clear the background color.

Maybe we can just use output_background_color "0" always to avoid unnecessary
HW usage.
Let's wait for other developers to comment...

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