Thanks Mikuro
I converted the avi to mpeg-2 in Visual Hub and then to DVD and this works ok and the audio isn't out of sync anymore. I will also try burn just out of interest to see what happens.
just adding this if anyone else searches for audio sync problems
http://forums.support.roxio.com/lofi....php/t791.html
I previously has probelms with ffmpegx & toast. I encoded the avi to author dvd and burnt to dvd via toast 8. The dvd worked but the sound was out of sync i believe this might be because ffmpegx uses quicktime codecs (which i didn't have installed) when this is burnt with toast 8 it re-encodes it again putting the audio out of sync. I have searched for a fix but i am unable to find a setting to turn off encoding in toast grrrr.