My videos wont sync to my ipod/?

Hi, I think it's the video codec issue. mp4 is a media container which can be encoded with many different codecs, so iPod just spports some special mp4 videos, as I know, the best video format for iPod nano 5th gen is mp4(avc/h.264 video encoder, aac audio encoder) videos, so you need to use a good software to convert your vob files to the iPod nano mp4 video files. I am using RZ Video Converter which can convert any videos or audios between different formats with good quality, such as convert vob files to the iPod nano mp4 video files, etc. then you can transfer the converted mp4 files into itunes, and sync to iPod nano. yahoo or google search and download RZ Video Converter, hope it can help you.