[Bug 655279] [playbin2] Don't reset sinks when not needed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=655279
  GStreamer | gst-plugins-base | git

--- Comment #1 from Edward Hervey <bilboed at gmail.com> 2011-07-25 16:44:35 UTC ---
Created an attachment (id=192622)
 View: https://bugzilla.gnome.org/attachment.cgi?id=192622
 Review: https://bugzilla.gnome.org/review?bug=655279&attachment=192622

playbin2: Avoid resetting playsink when not needed

When we don't have specific {audio|video|text}-sink properties, don't
set them on playsink when reconfiguring.
If we do that, we end up setting the previous configured sink to
GST_STATE_NULL resulting in any potentially pending push being returned
with GST_FLOW_WRONG_STATE which will cause the upstream elements to
silently stop.

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