[Bug 759624] v4l2: Exposes colorimetry for RGB format which confuses videoconvert

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759624

--- Comment #22 from Wim Taymans <wim.taymans at gmail.com> ---
> It seems to verify that the colorimetries are different for different frame
> sizes. At this point the subject is outside of my knowledge so I am not even
> aware if this is a problem of v4l2, v4l2src or videoconvert. Anyone know what
> is going on here?

When no colorimetry is specified, we take defaults. The default depends on the
resolution, we take BT601 for SD, BT709 for HD and BT2020 for UHD resolutions. 

You can see a color change in the blue and purple when resizing with this
example pipeline:

gst-launch-1.0 videotestsrc ! video/x-raw,format=AYUV ! videoconvert !
ximagesink

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