My macbook air was installed double system ,one is mac ox 10.6.7 another is windows7. the movie and the sound can't play together in mac system,however, it is normal when I play the same movie in windows7 system

my macbook air was installed double system ,one is mac ox 10.6.7 another is windows7. the vidoe and the sound can't play together in mac system.I have tried many vidoe play tools including mplayerx and lvc etc.however, it is normal when I play the same movie in windows7 system. who can help me！

Look at item properties for the .mov and .dv files. What exactly does it say they are? What drive are they playing back from? Make sure the contents of the viewer are set to fit to window in the View popup at the top of the viewer.

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