This tutorial covers using VirtualDub FilterMod to do just that fixing the audio sync issues and transcoding to the edit friendly Cineform codec at the same time.
The only way to fix this problem is to convert the source to something with a constant frame rate (CFR). This is fine if all you want to do is playback a clip but all kinds problems can turn up when you try to edit it with the most common being the audio going out of sync. If your source clips were recorded with a cell phone, tablet or screen capture software odds are they were recorded with a variable frame rate (VFR). The last line below says to save to AVI, and those files don't have audio, but when we save as quicktime, the audio is there. Again the question is why we don't have any audio in the transcoded clips now. These for the instructions we are using for Virtualdub2.
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