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Old 1st December 2008, 16:44   #4
Senior Member
Join Date: Aug 2008
Location: Perth Australia
Posts: 168
Under Preferences - Plugins - Input is the Nulsoft MPEG4 Audio decoder installed?

If so select it and press Configure. You will probably see M4A;MP4 as the file types. You could try removing ;MP4 from here (just leave M4A) and provided MP4 is listed as a video format (I assume you mean it's on the Directshow decoder list) then try again.

Obviously rename that file back from AVI as well.
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