[Bug 791471] v4l2object: non-default colorimetry broken for v4l2h264enc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791471

--- Comment #20 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Half of it can be fixed by not passing colorimetry to the encoder caps when
calling set_format. But then the encoder must not do any colorspace
transformation internally. This is probably fine for now, until we find an
encoder that does such transformation. I'll try and post this patch tomorrow.

GStreamer currently only try and set colorimetry on the OUTPUT, which is what
the spec says, but the probe function does not respect that. Basically, the
spec as-is prevent having multiple colorspace for a specific format/size on
CAPTURE devices.

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