I have two dvds that I'm trying to reauthor, 2-3 movies onto 1 dvd with subtitles. no matter what I do, for the 2end one the subtitles are always out of sync. I used subrip to get the subtitles, and that worked well for the 1st one. but nothing would resync the 2end subtitle

any advice?

I'm thinking of re-ripping the dvds onto my hd and starting all over. would that work?