[Bug 738069] waylandsink: avoid render twice the same buffer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738069
  GStreamer | gst-plugins-bad | 1.4.3

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-10-07 16:24:23 UTC ---
The default behaviour for this can't just be changed, so it doesn't really
matter ;)

It makes sense for some scenarios / sinks / APIs and less for others. It's easy
enough to work around for APIs that don't deal with this well.

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