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videomixer internal data stream error when requesting some colorimetries

Submitted by Florent Thiery @florent.thiery

Link to original bug (#776448)

Description

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