This has also been reported to nokia as a bug in the phonon backend, with a trivial fix, but I'm still not sure if the bug is in phonon or gstreamer. The fix looks like a hack.
http://bugreports.qt.nokia.com/browse/QTBUG-8737 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
