quick question guys... some of (well a lot of) my videos aren't being accepted in itunes apparently. i've downloaded some vids from like youtubedownload or download helper, and i had it auto convert to mp4 format. however, when i try to drag and drop it to itunes in the movies section, it just doesn't show up at all. i've tried playing them and some work and aren't getting into itunes, and some that don't work aren't getting into iTunes. any tips? [also, if a video doesn't work that' sbeen downloaded from like downloadhelper of something, what would be a good way to get them to actually work?] ~thanks!