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

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=681447

--- Comment #18 from Alex Băluț <alexandru.balut at gmail.com> ---
Created attachment 308218
  --> https://bugzilla.gnome.org/attachment.cgi?id=308218&action=edit
https://bug708882.bugzilla-attachments.gnome.org/attachment.cgi?id=255889

This is Mathieu's patch to be discussed whether it makes sense.

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