[Bug 732326] v4l2: slow UVC webcam startup due to excessive S_FMT

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732326
  GStreamer | gst-plugins-good | git

--- Comment #6 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-06-30 14:18:01 UTC ---
Right, so the current patch will "break" the fallback as originally designed,
as it won't restore the state on fallback. I wonder why is it needed to restore
last state in the first place. I'll try and find an answer in old commit
messages.

Even if restoring the state is needed, this action should only be done once per
probe, not for each format being tested. This would keep old behaviour, and fix
the performance issue (well, will still have 0.34 s overhead according to your
test, which isn't that low).

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