music dvd's gordian knot problem

[speedo]

i have just started ripping music dvd's with gordian knot but can't seem to do it

i have ripped loads of normal films without a problem

but when i set it up with a music dvd i leave it going fine only to find out later with it saying

job compleated in 15 mins or so it has done the audio but not the video

why is this

i have checked the 4 vob's and they all play fine

help me please

[speedo]

i have tried with a third music dvd and still get the same problem

there must be a way