Comment 1 for bug 662001

Does this occur in other packages that use gstreamer? Pithos just asks gstreamer for its default audio output device. Make sure this is set correctly in Multimedia Systems Selector (gstreamer-properties from the command line).

It also appears that your gstreamer has decided to use neon for HTTP. I haven't heard of that before, and have only tested Pithos with libsoup HTTP. I'm not sure what the difference is or whether that would cause a problem. The neon source only appears to be complaining because it has no output device.