.mov to .mp4 produces visuals but no audio

Hi
I am trying to convert a quicktime movie to ipod format. When it converts and I open in itunes there is no sound just the visuals. The .mov has audio though when i view in QT?
Also, are .mp4 the only formats ipod can recognize? If I do in fact post the .mov podcast to itunes, will itunes viewers be able to view the .mov on their ipod and in the itunes interface?
thanks

The video formats that the iPod (and iTunes by default) can use are listed in the iTunes Podcast Spec:
http://www.apple.com/itunes/store/podcaststechspecs.html
iPod can play the following video formats:
* H.264 video, up to 1.5 Mbps, 640 x 480, 30 frames per sec., Low-Complexity version of the Baseline Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
* H.264 video, up to 768 kbps, 320 x 240, 30 frames per sec., Baseline Profile up to Level 1.3 with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
* MPEG-4 video, up to 2.5 Mbps, 640 x 480, 30 frames per sec., Simple Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
Another good question is how are you converting your video. QT Pro has built in export templates to create files for iPod video. I'm sure that FCP and other Mac applications have similar.
Erik

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.mov to .mp4 produces visuals but no audio

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