[Bug 681447] video overlay composition: fix video blending over transparent frame

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=681447
  GStreamer | gst-plugins-base | git

--- Comment #15 from Thibault Saunier <tsaunier at gnome.org> 2014-11-27 15:28:19 UTC ---
(In reply to comment #13)
> Note that this basically converts ARGB to xRGB and makes all frames opaque. Not
> sure if that is generally the expected behaviour.

This is clearly not what we expect. In GES we have:

   videotestsrc ! video/x-raw,format=ARGB ! textoverlay ! ....

to create title clips and we definitely want the output of textoverlay to also
be ARGB in that case so that it is transparent when mixed with the compositor
downstream.

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