[Bug 776448] New: videomixer internal data stream error when requesting some colorimetries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776448

            Bug ID: 776448
           Summary: videomixer internal data stream error when requesting
                    some colorimetries
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This pipeline fails:
gst-launch-1.0 videotestsrc ! "video/x-raw, format=(string)NV12,
width=(int)1920, height=(int)1080, framerate=(fraction)30,
colorimetry=(string)bt2020" ! videomixer !  "video/x-raw, format=(string)NV12,
width=(int)3840, height=(int)2160, framerate=(fraction)30,
colorimetry=(string)bt2020" ! fakesink
ERREUR : de l’élément /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0 :
Internal data stream error.

Also fails:
gst-launch-1.0 videotestsrc ! "video/x-raw, format=(string)NV12,
width=(int)1920, height=(int)1080, framerate=(fraction)30,
colorimetry=(string)bt2020" ! videomixer !  "video/x-raw, format=(string)NV12,
width=(int)3840, height=(int)2160, framerate=(fraction)30,
colorimetry=(string)bt601" ! fakesink

Oddly, this works:
gst-launch-1.0 videotestsrc ! "video/x-raw, format=(string)NV12,
width=(int)1920, height=(int)1080, framerate=(fraction)30,
colorimetry=(string)bt2020" ! videomixer !  "video/x-raw, format=(string)NV12,
width=(int)3840, height=(int)2160, framerate=(fraction)30,
colorimetry=(string)bt709" ! fakesink

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