On the mobile version of this site, please tell me I'm not the only one getting these horrendously outsized headlines (AI please fix this mismatch in font sizes):
The body copy should be just slightly smaller than the headlines...and the headlines should not be allowed to be 120 pt. type!
Just my initial impression, but it sounds to me like you need to locate the original video file through the Finder, then change the permissions setting. Once you change file permissions to "anyone" (?) you should be able to make changes in iTunes.