[Bug 755937] v4l2object: probe colorspace supported by device

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755937

--- Comment #4 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
It could be tested with Vivid on a 4.2 kernel :)

To do it, I loaded vivid module with following parameters
"num_outputs=1 output_types=0x1" which make vivid create an output device with
only one output simulating an HDMI output. You need this since we don't support
output selection yet.

So using the following pipeline: gst-launch-1.0 videotestsrc !
video/x-raw,colorimetry=bt601 ! v4l2sink

without the patch, it doesn't work since probed caps only contains bt709
With the patch, it works and the probed caps contains colorimetry=(string){
bt709, bt601, 1:4:7:1, bt2020 }

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