If your AVCHD camcorder can not be recognized by iMovie, you will probably need to convert the files to MTS/M2TS QuickTime for playback or editing on Mac Or you'll have to view the footage on the camera or playback the videos with other players. X If you have QuickTime installed, you can also easily share videos to YouTube MTS/M2TS if you convert the files to QuickTime format. Just follow the 4 easy steps to convert to QuickTime on Mac MTS/M2TS (Snow Leopard included)