Loss of sound when converting video files

In iTunes 7 I am converting my video files such as avi so that I can put them on my ipod, but for some reason it stopped having sound. The video is still fine, but the sound is gone. It worked fine for the first 10 files or so and then it just stopped. Does anyone know why or how to fix this?
iTunes 7   Windows XP Pro  
  Windows XP Pro  

most likely you need to demux the file (untangle the audio and video). MPEG Streamclip is a good way to go to do this.
Export as a Quicktime DV-NTSC or DV-PAL (depending on your part of the world) and all should be good.
Cheers,
x

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