Apple skrev:It is not possible to export the audio portion of a muxed MPEG-1 or MPEG-2 audio/video stream using QuickTime. For editing purposes, the entire MPEG-1 or MPEG-2 stream is treated as a single sample. You may create edit lists to display parts of the stream in the usual way, but if you flatten the movie data, the entire stream is saved, not just the parts displayed in the movie.
You cannot perform editing functions such as Cut, Copy, Paste, Add, and Add Scaled with MPEG-1 or MPEG-2 media using QuickTime Player, whether or not you have upgraded to QuickTime Pro.
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