Binary package hint: rhythmbox
I am running Ubuntu version 8.04 Hardy. Rhythmbox version "0.11.5.0ubuntu8". I have all mp3 codecs, and can normally play media on Rhythmbox, however sometimes under conditions that I cannot seem to figure out yet, when I double-click to play a song, nothing happens. The play arrow next to the song in the library list comes up, the song info comes on up top, but it seems to get stuck at 0:00 or just does not play. If I try clicking again, the play arrow in the library list switches to pause, and Rhythmbox does not freeze, but it just will not play. I had crossfading turned on through all of this. I did turn crossfading off and restarted Rhythmbox, but it still will not play. I have not rebooted the computer since I turned crossfading off, but I would not know if that actually helped either since it does not always do this, and when I reboot it fixes the problem for a period of time anyway. I opened the System Log from "System > Administration" and while looking through the logs, I have found the following which may or may not help you, but here it is anyway.
This error was taken directly from both syslog and user.log. This error shows up every time I double-click the media to play:
"pulseaudio[5808]: module-alsa-sink.c: Error opening PCM device front:0: Device or resource busy"
ProblemType: Bug
Architecture: i386
Date: Thu Nov 27 19:47:49 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/rhythmbox
NonfreeKernelModules: nvidia
Package: rhythmbox 0.11.5-0ubuntu8
PackageArchitecture: i386
ProcEnviron:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: rhythmbox
Uname: Linux 2.6.24-21-generic i686
the error suggests a pulseaudio issue