[Bug 784010] New: Compositor produces broken video (with green stripes) when compositing BGRA and I420 that has been scaled

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784010

            Bug ID: 784010
           Summary: Compositor produces broken video (with green stripes)
                    when compositing BGRA and I420 that has been scaled
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sean at siobud.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Using the following pipeline

gst-launch-1.0 videotestsrc num-buffers=1 ! video/x-raw, width=10, height=10,
format=BGRA ! compositor name=c ! videoconvert ! ximagesink \
          videotestsrc ! video/x-raw, format=I420, width=1280, height=720 !
videoscale ! video/x-raw, width=1200, height=680 ! c.

I get video that looks like http://i.imgur.com/WK9bh9d.png

If you change the format to I420 on the first videotestsrc this issue goes
away. I use the videoscale outside the compositor for better performance (works
is spread across more threads it seems) if I don't I peg a single core much
quicker.

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