Videos don't appear on iPod touch 1st gen

Hello I have a video in .mp4 format which i can see on itunes and play absolutely fine. it appears on my ipod touch 1st gen sync menu, and the sync runs fine without any error messages. when the sync is complete and i go to videos on my ipod touch however it says there are no videos on there? what am i doing wrong?

also when i go on the 'on this ipod' tab in itunes the video doesn't appear. but 'sync videos' is ticked?