I just upgraded to amarok 2.2.0 from Debian unstable and when I play mp3 they "play" in an instant.
No sound plays but the progress bar flashes / fills and it moves to the next song.

Waves play but not mp3s.
The same mp3s were played in 2.1 fine and they play with mplayer fine.

Anyone else getting this issue?

What Phonon backend do you have selected in System Settings > Multimedia? The Xine backend is recommended.

I found I was missing libxine1-ffmpeg package.
I installed that and it solved my issue.

Thanks.