[Bug 790265] v4l2src: Give preference to contiguous memory format over non contiguous one while setting format to /dev/video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790265

--- Comment #13 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
For more context, the conflict is mainly Exynos vs Zynq.

  v4l2src ! v4l2h264enc output-io-mode=dmabuf-import ! ...
  v4l2src ! omxh264enc ! ...

I have to admit, the first pipeline don't work anymore on Exynos, due to driver
issues, though to work it requires two allocation. While for the Zynq case, to
work we need 1 allocation.

If we flip the allocation the other way around, we loose the ability to
multiplex using tee. Though, DMABuf exportation is not implemented by the Zynq
OMX component. All this is pretty much a dead-end without some sort of
negotiation or trial and error.

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