[Bug 740222] libav: Video decoder maps buffer READ/WRITE instead of just WRITE

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740222
  GStreamer | gst-libav | 1.4.4

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2014-11-20 14:41:05 UTC ---
We can read the code, it is clearly doing both in direct rendering mode. After
it has let the frame go, it can't ever think of writing to it again, not
without an API to let it know when it's rendered. It could still be readind,
I'd like to test this.

Right now we do the silliest thing ever, we push a buffer mapped in READ/WRITE.
It only worked because XImage does not call map.

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