So I've been recording some HD movies on Cinemax and HBO and, for some reason, they're broadcast with 2.0 tracks instead of 5.1. I'd like to sync up the 5.1 ac3 (or DTS) track from the DVD with the HD video. What's the easiest way to go about making sure my sync is 100% accurate? Unfortunately, there's no audio program (that I know of) that will allow me to match up multiple audio tracks like that and export without re-encoding.
Thoughts?