Quote:
an AVI made by an old Canon camera
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Then it looks like the AVI file was muxed incorrectly, or in an "uncommon" way. AVISource()
probably WON'T work in this case. You could remux it with ffmpeg, VirtualDub, or AVI-Mux GUI. Or even better, extract the audio to an uncompressed WAV file, doing without wavi altogether.