I have a bunch of AVI movies that I'd like to add Chinese subtitles to so my girlfriend can watch and follow at the same time. Likewise, I have some movies in Mandarin that I'd like to add English subs to. Does anyone here have experience with this sort of thing? I've googled a bunch of tutorials, and found many different types of software like Virtualdub, Vobsub, etc... but have no idea which one is the best/simplest method.