[Bug 769962] videocompositor: Remove output format alpha check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769962

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |slomo at coaxion.net

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
What is exactly the problem you observe?


This code is there because otherwise compositor will already operate on a
non-alpha format when doing the blending. It always does the blending on the
output format.
Blending on non-alpha formats means however that you completely ignore the
alpha channel of the input, and that's a (quite severe) loss of information.

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