A friend of mine ask me a question just like this:
“I have a bunch of H.264 files from Canon 5D Mark II(5dM2) camera that I have synced in Final Cut Pro but editing the H.264 codec is awful so I was hoping to convert it all to ProRes to have an easier time editing.”
It seems the H.264 files can’t be edit in FCP, using H.264 compression method for recording video files to the camera’s memory card is an ideal way for video capture in an SLR camera, such as Canon EOS-1D Mark IV, EOS 5D Mark II, EOS 7D, EOS 60D and more, delivering relatively compact file sizes with image quality noticably superior to alternative video compressions (like Motion JPEG).
However, H.264 is a distribution codec for finished work while ProRes is an editing codec to provide very high-quality images without taking lots of storage space. Therefore, the H.264 compression format requires to be transcoded into a format better suited to editing, effects and color grading. The Apple ProRes formats will be a nice choice.