I've got a HD copy of Hancock from one of my BluRays which was ripped on Windows. I've imported it onto my MacBook Pro, and I've gone to play it in Quicktime, and its very jittery. Is there anything I can do to make sure it plays smoothly, like iTunes HD downloads? Also, will converting it to MPEG4 help, as I know Quicktime doesn't play nice with AVI, and how would I do this? Thanks!