A .mp4 file plays but with no sounds or visual

I have just downloaded some .mp4 video files from the Net just to try out my new iPod video function.. Some of the files I downloaded work just find but there is one that I have problem with. I can play the file just on the video display at the bottom left corner in iTunes library and iPod library when it is connected to iTunes. But when I try to play the file on the iPod itself, it shows only black screen with no sounds but the timer is still going as if the clip is playing.. What's going on here? I mean I understand other problems that people have but this video file does play on iTunes and iPod library but not on the iPod itself.. Please help!
  Windows XP  

Sadly not, no-one came back to me and the iTunes help was no help what-so-ever.
So far I have bought 1 tune (which was "exclusive" to Apple... but then not because it came out on CD after all) and one video which I can't hear.
I therefore think that iTunes ***** and haven't bothered using it since.
I have remained subscribed though just to see if anyone does get this one sorted.
Good luck to us both.

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