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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #8 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #7)
> The problem is that we need to only suggest things that are possible in our
> transform caps call. Failing trying to do something that is not supported is
> not acceptable. There could be an element downstream the do scale correctly.

I'm entirely agree with that.

> 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.

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