[Bug 793463] avvidedec: gstlibav video decoder does not unmap the output frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793463

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #368350|none                        |rejected
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--- Comment #5 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Review of attachment 368350:
 --> (https://bugzilla.gnome.org/review?bug=793463&attachment=368350)

This patch is not really safe, since the frame may still be read by ffmpeg for
later frame construction. The proposal is to implement a remap mechanism, so we
can make it read-only before pushing. This is of course specific to direct
rendering mode, which need to be ported to a new FFMPEG API, hence all this may
be just legacy, to be confirmed. Note that we do unmap the frame, but later on,
generally upon next decoded frame.

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