movie/music video issues

i hope someone can help me, i got alot of music videos from youtube coverted onto my ipod over the years, and when i put them onto my ipad they all appear under 'videos' seperate from 'ipod'. the problem is my music videos, tv shows and movies all appeare under 'videos' and when i try to drag them to the tv show or music video playlists they wont budge.
i was just wondering if someone could help me figure out a way to put them in the right playlists?? thanks!!