Following the QuickTime Q & A webpage we opened the other day, we have posted a similar webpage for Apple’s Final Cut Pro to answer some of common questions.
Click on the button to read Final Cut Pro Q & A. 
Final Cut Pro 6 is a product of Apple, Inc.
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How do you demux your video file into M2V and AC3 with Final Cut Pro 6? Is there such a function at all?
>Is there such a function at all
No. use MPEG Streamclip by Squared 5.