[Bug 736655] basesink: preroll issue for some clips which audio is shorter than video

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736655
  GStreamer | gstreamer (core) | 1.2.3

--- Comment #11 from kevin <kevinbing.song at gmail.com> 2014-09-16 10:12:30 UTC ---
The test clip is audio shorter than video. user pause the player when audio
already EOS and video is playing.

My understand is: 
1. sink will finish pre-roll if received GAP event; 
2. streamsynchronizer should send GAP event when PLAYING to PAUSE state as it
is blocked by gst_pad_push() function in chain function and can't send GAP
event;
3. video already reach PAUSE state as video sink already received one buffer;

Is my understand right?

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