iPod touch can't synch .mov files with iTunes.

My iPod touch can't synch .mov files with iTunes. The error message says that the files were not transfered because they can't be read on my device. I'm not able to transfer any mp4 files, either. These are my own short animations, small files (under 2MB). Home sharing is on. I'm trying to synch with the latest version of iTunes on a Windows 7 64-bit machine. Thanks.