[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 #14 from Andreas Frisch <fraxinas at opendreambox.org> 2014-11-10 10:25:26 UTC ---
this is just how assrender does it, too.

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