I recently tried to edit .mp4 files in FCE but it would not allow me too. I then found a way to convert them to .mov files and was able to edit them. The problem is that when I convert the .mp4 files in MPEG Streamclip, the file size goes from say... 300 mb to 4-5 gb. I have limited space on my mac and I was just wondering if there is a smaller file size that I would be able to work with that has the same quality as .mov's. Is there a way to work with my mp4's? The codecs on the mp4 I use are H.264, AAC. PLEASE HELP!