[Bug 757610] compositor: negotation failure when mixing alpha and non alpha branches

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757610

--- Comment #15 from Philippe Renon <philippe_renon at yahoo.fr> ---
I built 1.6.3 and was able to reproduce the issue with this pipeline :

compositor name=mixer ! videoconvert ! autovideosink videotestsrc ! queue !
mixer. udpsrc port=9000 ! textrender ! videorate drop-only=true ! video/x-raw,
framerate=10/1 ! queue ! mixer.

Then rebuilt with the proposed fix and was not able to reproduce it anymore :).

Please note that I feel that the whole has_alpha stuff is not needed ;)

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