[Bug 679612] New: videoconvert produces empty output when converting from GRAY8

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=679612
  GStreamer | gst-plugins-base | 0.11.x

           Summary: videoconvert produces empty output when converting
                    from GRAY8
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tom.winkler at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The following pipeline produces a single-color green image output instead of
the expected grayscale output:

gst-launch-1.0 videotestsrc ! videoconvert ! video/x-raw, format=GRAY8 !
videoconvert ! autovideosink

Investigation the problem a bit more revealed that videoconvert seems to have a
but when convertion data from GRAY8. The following pipeline shows that the data
is all zero:

gst-launch-1.0 videotestsrc ! video/x-raw, format=GRAY8, width=8, height=8 !
videoconvert ! video/x-raw, format=I420 ! fakesink num-buffers=3 dump=true


Result of pipeline execution is here: http://pastebin.com/AKsQgwYa

Gstreamer is 0.11.92 (tarballs from website not git head).

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