[Bug 784674] v4l2: Aspect Ratio probe does not work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784674

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Basically, the spec says that the aspect ratio is stable for the same TV
standard. tv-norm in 1.0 has been a no-op since the start, so it means the
aspect ratio can only be fixed for nodes handled by Gst. We should pull out the
cropcap burried into the deepest probe function, and just call this once, save
it in the GstV4l2Object and badger all structures with it. Except of course for
encoded formats and for GstV4l2Transform element.

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