[Bug 755392] video: bugs with gst_video_frame_copy and videoconvert (with test scripts)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755392

--- Comment #3 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Update about the videoconvert regression: the breakage happens when
videoconvert converts to r210/GBR_10LE/GBR_10BE and bayer dithering is enabled.
Also, these three formats are all about 4:4:4 RGB with 10 bit channels,
explaining why the frames are broken in exactly the same way.

Example pipeline:

gst-launch-1.0 videotestsrc ! "video/x-raw, format=BGRx" ! videoconvert
dither=bayer ! "video/x-raw, format=r210" ! videoconvert dither=0 !
"video/x-raw, format=BGRx" ! ximagesink

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