Best way to fix avi audio/video out-of-sync in Leopard?

I have a few avi files where the audio plays about half a second ahead of the video.

Is there a good (reasonably non-complex) way to fix this under Leopard? An app or something?

I want to fix them permanently, not just for computer playback. I would like to be able to burn them to disc and watch them on my DVD player.

I know that it is possible to set delays in the playback in VLC and other programs, but I am not looking to fix the videos for watching on the computer.

Thanks for any help.