[Bug 786133] qmlglsink: Retain the previous frame to avoid flickering artifacts

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786133

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

           What    |Removed                     |Added
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                 CC|                            |nicolas at ndufresne.ca

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
In general, we try and let upstream account for the in-flight buffer, so I'd
say two.

Just as a reminder, this is of course a work around, it's not guaranteed it
will always work. Long term solution would be to add a fence after the render,
and wait for that fence before releasing.

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