mplayer command line in mythtv

I've discovered that SMPlayer calls mplayer (successfully) with a whole lot more options than mythtv (unsuccessfully).

SMPlayer:

mplayer -noquiet -nofs -sub-fuzziness 1 -identify -slave -vo xv -ao oss -zoom -nokeepaspect -framedrop -input conf=/usr//share/smplayer/input.conf -stop-xscreensaver -wid 65011726 -colorkey 131586 -monitoraspect 1.25 -fontconfig -font Sans Serif -subfont-autoscale 1 -subfont-text-scale 5 -subcp ISO-8859-1 -aid 6018 -subpos 100 -contrast 0 -brightness 0 -hue 0 -saturation 0 -cache 2000 -osdlevel 0 /mnt/video/1005_20070524230000.mpg

MythTV:

mplayer -fs -zoom -quiet -vo xv %s

Just tried it - no luck. Same old error. Reverting...