[Bug 722303] v4l2sink: Enable rendering of the preroll buffer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722303
  GStreamer | gst-plugins-good | git

--- Comment #5 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-26 15:31:19 UTC ---
Ok, the status is that this method is wrong for encoder, since the encoder
won't let you dequeue it's observation. We have to copy if we want to render
the same buffer again, it's actually very simple to do.

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