"On the Cheap" method: find a copy of MoviePlayer 2.5, then make sure you have Quicktime 4.1 (or so) installed with all the extensions in your System Extensions folder (these would be QT Authoring, Capture, Effects, etc.). Then just open the movie in MoviePlayer 2.5 (don't click on the movie to lauch application) and just "export Movie to DV Stream". Other option is to buy QuicktimePro which will give you a code to unlock the latest QuicktimePlayer to do the same thing (& more).