Comment 5 for bug 230877

Binary package hint: dbus

When running mplayer the dbus library forks out the dbus-launcher which inherits the filedescriptors of mplayer.
If one of those filedescriptors accesses a video4linux or DVB device the filehandle will be kept open. In case of multistandard devices which support analog TV or digital TV (or other modes) this will lock the device in the corresponding mode until someone kills the dbus daemon.

Attached you can find a patch against the ubuntu dbus package

English:
http://ubuntuforums.org/showthread.php?t=652941
German:
http://www.ubuntu-forum.de/artikel/29814/dbus-blockiert-datei-nach-mplayer-aufruf.html