[Bug 742917] v4l2: Allow scaling in the v4l2*convert element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742917

--- Comment #9 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Aurélien Zanelli from comment #8)
> > If V4L2 don't tell us that, we should at least create a white list.
> There is currently a way to probe if the device can scale or not by checking
> the crop window against the set format. But I don't really know if it's
> reliable or not.

Oh, and I saw you patches btw, but could not completly make my mind. The crop
API being what it is. (and v4l2 people telling me to use SELECTION which they
didn't implement ;-P). I guess we need to do some more testing to find the
right information.

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