[Bug 703480] New: ges: Can't control alpha on layers anymore

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703480
  GStreamer | gst-editing-services | git

           Summary: ges: Can't control alpha on layers anymore
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-editing-services
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=248253)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=248253)
Alpha based chorus effect the triggers the regression

It seems that controlling alpha channel of each layers is currently broken in
master. This used to work in the mixing branch before it got merged to master.
There is a python script that can be found at:

http://mathieuduponchelle.github.io/coding/2013/06/08/Fun-with-videomixer.html

I also rewrote that script in C, see attached file.

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