[Bug 666090] New: [video] Add support for pre-multiplied alpha

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=666090
  GStreamer | gst-plugins-base | 0.11.x

           Summary: [video] Add support for pre-multiplied alpha
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently only non-premultiplied alpha is supported. I'd add it by adding new
variants of all the video formats with alpha and adding a new flag to
GstVideoFormatFlags.

Adding it to GstVideoColorimetry is probably not enough because that is not
negotiable currently

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