DVD player reads dirty DVD

I have been backing up my DVD collection for a while and have a problem I can’t figure out. I’ve done a few hundred backups, which play fine on my DVD player, using the latest versions of DVD Shrink, DVDFab HD Decrypter4, RipIt4Me, and ImgBurn. But for some reason every movie I’ve backed up recently, like American Gangster, Beowulf and a few others, plays fine on my computer and laptop but will not play on my DVD player. I just says the movie is dirty and won’t play. I’ve uninstalled and reinstall my software, cleaned my DVD player, and updated any firmware for my drives on my computer with no luck. Any ideas?