[Bug 796789] v4l2 initialization fails with TRY_FMT call

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796789

--- Comment #2 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 372998
  --> https://bugzilla.gnome.org/attachment.cgi?id=372998&action=edit
v4l2src: Try to avoid TRY_FMT when camera is streaming

Some camera firmware crash is TRY_FMT is called during streaming. As a
side effect. This try and detect that the same format as currently
running is about to be tried, and skip renegotiation.

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