EOS 5D Mark IV: In-camera movie editing

After shooting movies on the EOS 5D Mark IV, you can simply edit the movie clips to trim the beginning and end of the clip and so save space on your memory card. If you find that the camera is not allowing you to edit the movie clip, check your battery level – when the battery is low, movie editing will not be possible until you switch to a fresh battery.
EOS Movies
EOS 5D Mark IV