Comment 11 for bug 956830

I just could reproduce the mistake in a fresh install of 12.04 amd64:

The following transitions cause a pause:
  mp3->ogg

These do not:
  ogg->mp3

I thing bug https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/978604 deals with the same problem.

kde - player amarok has the same problem.

in syslog i find:

pulseaudio[1900]: [alsa-sink] ratelimit.c: 56 events suppressed
pulseaudio[1900]: [alsa-sink] protocol-native.c: Failed to push data into queue

sound in 11.04 was ok.