I have this problem in ubuntu hardy, with a 2 mbit/sec video clip being
streamed over localhost with rtsp.  A few seconds into the clip, the
audio drops out for just under a second, and gst-launch prints this:

WARNING: from element /playbin0/abin/audiosink/audiosink-actual-sink-alsa: 
Compensating for audio synchronisation problems
Additional debug info:
gstbaseaudiosink.c(1190): gst_base_audio_sink_render (): 
/playbin0/abin/audiosink/audiosink-actual-sink-alsa:
Unexpected discontinuity in audio timestamps of more than half a second 
(0:00:00.811836734), resyncing

>From that point on, audio and video remain out of sync by just under a
second.

VLC and mplayer handle this stream with no such problem.  Gstreamer
plays the video clip directly from the filesystem with no such problem.
The glitch only shows up when using gstreamer to stream it
rtsp://localhost.

I'm marking gst-plugins-base as affected by this because I think it
contains audiosink-actual-sink-alsa, which seems to be emitting the
warning message.

-- 
Audio goes out of sync with video
https://bugs.launchpad.net/bugs/183692
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