I've read of this issue before somewhere. It would take me too long to find the discussion. But from memory I think it has to do with your videora settings. I suspect you have forgotten to tick the option to include audio. Check your output/converter options. See
http://www.gnutellaforums.com/showth...776#post129776 Also see
http://www.gnutellaforums.com/showth...612#post172612
You can test the video out before adding to iTunes/iPod using
VLC - (click on link) _ (choose nearest mirror site)