From davidsansome on September 19, 2010 23:52:18

It sounds like something's wrong with your sound setup. Try installing these packages:
sudo apt-get install pulseaudio gstreamer0.10-pulseaudio
Then quit and re-open clementine.

If that doesn't work, can you try running this and see if you hear a tone:
gst-launch audiotestsrc ! autoaudiosink

From bigbrovar on September 20, 2010 00:50:53

I am running kde 4.5 (Kubuntu lucid) which uses phonon with xine backend. kubuntu does not ship/use pulseaudio (at least the lucid version) Installing the packages you suggested would just mess up my sound setup. If I might add every other sound application (kde and non kde) works very well even mpd. I would ask the kubuntu/kde irc if anyone else is having issues with clementine to ascertain if this is a general kde/kubuntu problem.
PS the "gst-launch audiotestsrc ! autoaudiosink" resulted in comman not found, again because kubuntu/kde sound setup uses phonon and xine instead of pulseaudio/gstreamer which are gnome specific. Thanks for the help :)

From bigbrovar on September 20, 2010 02:16:06

I did further testing and I noticed that when I start clementine, The first track plays. after which when I try to play another track I get the same error. When I start from the commandline here is what I got

"gstjackaudiosink.c(374): gst_jack_ring_buffer_open_device (): /GstJackAudioSink:autoaudiosink-12-actual-sink-jackaudio:
Jack client open error (status 1)"
"gstautoaudiosink.c(375): gst_auto_audio_sink_detect (): /GstPipeline:pipeline/GstBin:audiobin/GstAutoAudioSink:autoaudiosink-12:
Failed to find a supported audio sink"
Gstreamer error: "Could not open resource for writing."
QTimeLine::start: already running
Gstreamer error: "Could not initialize supporting library."

From bigbrovar on September 20, 2010 12:16:44

Installing gstreamer-alsa package seems to solves the problem. so I guess the bug report can be marked as closed/solved

From john.maguire on September 21, 2010 08:58:18

Status: Invalid

From ojirio on October 15, 2010 15:31:49

This is real issue.
With JACK gstreamer output plugin when crossfading tracks.
Another problem with this output plugin is that the JACK connection is created and dumped every time playing is stopped, which is very bad because JACK is used by professional musicians to freely route sound between applications in data-flow-like manner. Clementine currently connects every time to the default system playback output, and if you reroute it (for example postprocessing), after stopping playback and starting again the route is dropped and recreated to the default again...
So Clementine should maintain stable connection for the whole time it is running (as other JACK compatible apps do it).