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go to the top menu bar (the white one about your desktop, you know file, edit, ect) and go over to share, scroll down and click quick time (second option i think), when it give you a new window with shit in it there is a select an option thingy that says compress movie for: select full quality, then it will import it on to your desk top in the highest quality quick time video, this may take a while to do, just a head up