[Bug 743973] streamsynchronizer: need find the least running time from segment

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743973
  GStreamer | gst-plugins-base | 1.4.1

--- Comment #3 from kevin <kevinbing.song at gmail.com> 2015-02-04 14:40:39 UTC ---
So the solution should be below:
1. playbin add pad probe function to probe event from demuxer source pad and
subparse source pad.
2. hold segment event until received all segment event.
3. select the least segment.time and segment.start.
4. replace all segment event with the least segment.time and segment.start.

streamsynchronizer already has hold and wait segment function. But the wait
only take effect when received segment start event.

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