I am trying to convert a 1080p .mp4 movie to .m4v for iTunes, and I ran it through MPEG Streamclip, but when I exported, I got the error message "invalid framerate." I had not set a framerate, but after that, I set it to 23.97 and i got the error message "can't prepare the movie." Please help. By the way, what would be the best presets within Streamclip for a 1080p cinematic film? Note that interlacing can die in the fiery depths of hell... also note that I want all 2,073,600 pixels back.