Yeah, well I've just been reading up on the kvcd format and etc. followed darkprinces guide and have had some success creating kvcd files .

However the file I just converted was a DiVX at 640x320, reencoded with the kvcdx3 template, using tmpgenc and moviestacker, reccomended scripts etc.

The movie came out ok, but for some reason it's gone from being a 24 min file to a 16:30 one?? all the frames seem to be still there, but it seems to randomly speed up, not always in the same place though. im confused :/

sorry for the truble I'm sure this is a painfully obvious thing, im just a bit lost with all this fancy talk of prediction and quantization matrices etc

It's hard to tell with the few element you give.
Fill up the form that is provided here and we will know a little more :

http://www.kvcd.net/forum/viewtopic.php?t=8753

if its ok i'll do some more research before getting back to you