The problem persist here (mplayer-nogui 0.99+1.0pre8-0ubuntu8) but the workaround (add "afm=ffmpeg" in /etc/mplayer/mplayer.conf) do the trick.
-- Distorted MP3 sound https://launchpad.net/bugs/85751 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs