Why did Final Cut Pro turn a 320mg file into a 5.3gb file? I dont get why FCP exports the files to be so massive. Another file I had went from 114mb to 1.89. I went to a concert and took a video of a song. Just now, I went back and added music from the soundboard over the video. After exporting, the file size turned out to be 5.3 gigs. I chose "Quicktime Movie." Why are these files so massive? How can I make them smaller? Is there some codec I need installed? Thanks for the help .