[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 #40 from kevin <kevinbing.song at gmail.com> 2014-12-30 12:12:20 UTC ---
The infinite amount of silence should be interrupt by buffer or GAP event. Some
thing like 20 ms one time. If still no buffer or GAP event, playback another 20
ms.

Rewind case is our demux will send EOS to audio track when rewind. Video will
only send key frame. I remember streamsynchronizer can't send GAP event to
audio sink. Should be a bug.

The root cause of the issue in the thread is audio sink can't finish pre-roll
as GAP event can't be send as streamsynchronizer blocked on video push. And the
GAP event send in chain function has many conditions (so it will can't be
send). So is there more good resolution to handle this?

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