I am not a big vegas 8 user but I trying to encode a short film to quicktime h.264/avc codec. It seems to work but audio and vido are out of sync a lot. It is inconsistent so I can't just shift the audio track +/-.

It appears to drift in and out of sync.

Thanks in advance.

The Quicktime H.264 encoder is notorious with incompatibility with Vegas. Use the "MainConcept AVC/AAC" encoder instead.

Sadly that is the one that I have been using already. :(

Try playing the file in VLC, it might be your QuickTime player that is causing sync problems.