I am still running 10.8 but sent an app to a friend that is running 10.9 and it did not work. It looks like Apple finally did away with the QuickTime Framework. My app scans a drive and creates a NSTableView with poster frames of the videos and can play the video in a QT view. Doing research yesterday everything is done with AV Foundations from 10.9 and on. I found this Apple youtube video http://www.youtube.com/watch?v=mCiZW2xW4Ks that explains things pretty good, but was wondering if anyone could recommend any good sites that have clear tutorials I could work through to better help me grasp AV Foundations. Thanks.