I've been using mac.jedi's dvd ripping tutorial to digitize my dvd collection, and for the most part it is working perfectly. However some discs are problematic- One TV series I ripped puts all of the episodes into one long m4v file, with credits at the start and beginning of each episode. Another series imported just fine, but I would like to trim it down to exclude the "Previously on..." recap at the beginning of the show. What software/method is best suited for this type of trimming of a m4v file? I have quicktime pro, but as far as I can tell if I want to export the video out as a m4v again it will be a pretty lengthy process. Is there a better way?