[Bug 730698] v4lsrc: Fails using glimagesink in userptr

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730698
  GStreamer | gst-plugins-good | git

--- Comment #4 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-24 22:41:39 UTC ---
Ok, after fixing tons of decide_allocation bugs, adding use of proposed
allocator (even though this was not strictly required), it was still failing.
Then I track it down to the frame mapping code and found that flags MAP_READ
was set instead of write (capture and output was flipped), doh!.

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