[Bug 745441] v4l2: Detect lossed frame and warn

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745441

--- Comment #21 from Peter Seiderer <ps.report at gmx.net> ---
Created attachment 300490
  --> https://bugzilla.gnome.org/attachment.cgi?id=300490&action=edit
[PATCH v5 3/3] v4l2src: device sequence/offset correction in case of
renegotiation

The v4l2 device restarts the sequence counter in case of streamoff/streamon,
the GST offset values are supposed to increment strictly monotonic, so
adjust the sequence counter/offset values in case of caps
renegotiation.

Tested with usb webcam and v4l2src-renegotiate test program [1] from [2].

[1] https://bugzilla.gnome.org/attachment.cgi?id=298324
[2] https://bugzilla.gnome.org/show_bug.cgi?id=682770

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