hmmmmmmm
if u wanna extract from DVD VOB's then u can also use dvd2avi !!
and use the save WAV feature
alternatively u can compress to mp3 ...
but again ull need a cuttin software to extract the particular clip u want

this will rip the whole movie sound !!
u can use mp3splitter if uve said audio as mp3
PS i think this works on avi's etc too !
give it a shot
its simpler to use than virtualdub ...
fiddle ard with VD tho .. its worth it ... gr8 piece of software .