[Bug 719431] New: videomixer should fail when it can't preserve the alpha channel of input streams.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719431
  GStreamer | gst-plugins-good | git

           Summary: videomixer should fail when it can't preserve the
                    alpha channel of input streams.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mathieu.duponchelle at epitech.eu
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=262954)
 View: https://bugzilla.gnome.org/attachment.cgi?id=262954
 Review: https://bugzilla.gnome.org/review?bug=719431&attachment=262954

fixes the reported issue

Examplified by :

gst-launch-1.0 videotestsrc ! alpha method=green ! m.sink_0 videotestsrc
pattern=checkers-8 ! m.sink_1 videomixer name=m sink_0::zorder=1
sink_1::zorder=0 ! xvimagesink

Adding a videoconvert before the sink shows the correct behaviour.

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