[gstreamer-bugs] [Bug 610228] New: gnloperation + videomixer priority issues

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=610228
  GStreamer | gnonlin | 0.10.13

           Summary: gnloperation + videomixer priority issues
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.13
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gnonlin
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: brandon_lewis at alum.berkeley.edu
         QAContact: bilboed at gmail.com
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=154002)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=154002)
transition1.py

The use case for transitions looks like the following composition:

[videomixer---------------------]
       [gnloperation]
[src a -------------]
       [src b ------------------]

If you arrange them like this, the transitions work fine (see attached:
transition1.py). The image correctly fades from A to B (the video mixer places
A on top B and the gnloperation modifies source A).

My understanding is that this is also supposed to work when A and B share the
same priority, however it does not. The videomixer places B over A, and the
gnloperation modifies source B. The transition in effect runs "backward" (see
attached: transition2.py)

In addition, my understanding is that this is supposed to work when the alpha
element has the same priority, but it does not. The gnloperation has no effect
whatsoever when all three elements have the same priority (see attached:
transition3.py)

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