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Mp4 videos show up in iTunes but not on iPod.

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So I've been downloading a lot of mp4 videos, and there was no problem with putting them on my iPod. But for some reason about 10 of those videos DO show up in iTunes, but don't show up on my iPod. I have no idea why! Does anyone know what I have to do now? I downloaded all the videos from the same source and I already tried to convert them into iPod format, but the program I use says they are already mp4. (Duhh.) Anyway, help?