[Bug 769962] videocompositor: Remove output format alpha check

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to kevin from comment #2)
> We write one plugin based on videoaggregator for our hardware. The hardware
> has the capability to do video blending. The input has alpha channel and the
> output hasn't alpha channel. And we need the plugin output video format
> without alpha. But above code will report error. And plugin can't overwrite
> the function which report error.

Then some API has to be added to videoaggregator to allow subclasses to
override this behaviour. glvideomixer would be able to make use of that too.

> Can changed to just print warning for loss of information?

No, as that will cause silent loss of information when using compositor.

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