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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #13 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
I was on holiday. I accept the argument in comment 10. My only concern was
around the granularity of the scaler and how do we handle it. Scaler often only
support sizes with multiple of 2 or even 16. Also that concern that it may fail
randomly since the kernel fixes to round S_FMT properly is still not merged
yet.

Would it be possible to document you approach to handle a scaler that can only
scale with multiple of 2 or 4 ?

Though, in general, as long as we have a plan on how we want to handle this,
and that the code mostly reflect that, I'm fine.

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