[gstreamer-bugs] [Bug 625452] New: Green twitching when run videomixer with alpha

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=625452
  GStreamer | gst-plugins-good | 0.10.21

           Summary: Green twitching when run videomixer with alpha
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.21
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: superlou at comcast.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Running the posted sample pipeline:
gst-launch-0.10 videotestsrc pattern=1 ! video/x-raw-yuv,
framerate=\(fraction\)10/1, width=100, height=100 ! videobox border-alpha=0
alpha=0.5 top=-70 bottom=-70 right=-220 ! videomixer name=mix !
ffmpegcolorspace ! xvimagesink videotestsrc ! video/x-raw-yuv,
framerate=\(fraction\)5/1, width=320, height=240 ! alpha alpha=0.7 ! mix.

The video output looks like it's working except it twitches green.  I get
similar twitching behavior with a simpler pipeline I made using videomixer and
the alpha element, though the twitching is not always green (seems to depend on
the mixed video source). (gst-launch-0.10 videotestsrc pattern=0 ! alpha
alpha=0.5 ! queue ! videomixer name=mix ! ffmpegcolorspace ! videoscale !
ximagesink videotestsrc pattern=4 ! alpha alpha=0.5 ! queue ! mix.)

I have tried the example with Ubuntu desktop effects both on and off as well as
sinking to ximagesink as well as xvimagesink, all with similar results.

Let me know what other debug information I can provide.

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