How do you synch the audio when the codec is xvid?

Can anyone help? I have an xvid movie which plays back fine on my pc but I want to put it on dvd. I have tested it for bad frames with virtualdub no probs, then saved the audio and video separately with direct stream no probs Now, encoding it with tmpgenc I use the SVCD template and not the wizard as this holds the correct fps 24,976. I then encode the video and audio separately then go to to tools where I simple multiplex, when I play it back there is sound but it is not synchronised with the action. How do I correct this? I do not have this difficult with divx files which I can save and encode all as one without losing the audio. But Xvid does not allow you to do this.

I do hope somebody has the answer for me. Thanks alot Clive

 

You can use AVIFix to synchronize the audio and video. It can be found http://www.divx-digest.com/software/avifix.html
If that does not work you can try VirtualDub.
http://www.afterdawn.com/software/video_software/video_tools/virtualdub.cfm