[Bug 726257] New: [pitivi] Cannot create auto transitions between two PNG image clips that use compositing on top of another layer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726257
  GStreamer | gst-editing-services | git

           Summary: [pitivi] Cannot create auto transitions between two
                    PNG image clips that use compositing on top of another
                    layer
    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: nekohayo at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Have clips like these:

    [=== A ===] [=== B ===]
[========== C ============]

Where A and B are transparent PNG files.
A has an opacity curve that goes from 0 to 100% at the beginning.

If you cross A and B together to have a transition, instead of seeing the
crossfade (or any other type of transition), you will see a black frame for the
duration of the transition.

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