Did you do something to it to make the audio corrupt such as author it to a disc image or something? It's unlikely that the audio track got corrupted by just playing the movie. Also, how do you mean corrupt? Does it not play or is it crackly, hissing, skipping?
If you need urgent help, it helps to provide as much information as possible. The sort of problems that go 'it was workin', now it ain't' are very difficult to figure out without detailed information.
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