I was just debugging mplayer.sh because I could not get it to play a .vdr file with an audio track set to "0", then I realized that if the AID is set to 0, the mplayer plugin does not actually specify 0 for the AID track (it just leaves it blank). The following changes to mplayer.sh fix the problem. while shift; do if [ "$1" = "SLAVE" ]; then declare SLAVE="$1" elif [ "$1" = "AID" ]; then declare AID="-aid $2" shift fi if [ "$AID" = "" ]; then declare AID="-aid 0" fi done Regards, C.