Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 276

Compression method [ ] ALL-I (For editing/I-only) Compresses each frame, one at a time, for recording. Although file sizes are larger than with IPB (Standard), movies are more suitable for editing. [ ] IPB (Standard) Compresses multiple frames at a time efficiently for recording. File sizes are smaller than with ALL-I (For editing), which enables movie recording over longer periods (with a card of the same capacity). [ ] IPB (Light) Since the movie is recorded at a bit rate lower than with IPB (Standard), the file size will be smaller than with IPB (Standard) and the playback compatibility will be higher. This will make the available recording time longer than with IPB (Standard) (with a card having the same capacity). Movie recording format [ ] RAW When [ ] is selected, movies are recorded as RAW movie files (file extension ".CRM"). [ ] MP4 When [ ], [ ], or [ ] is selected, movies are recorded as MP4 movie files (file extension ".MP4"). This file format provides higher compatibility for playback than with MOV. RAW movies RAW movies are raw, unprocessed data from the image sensor that are recorded to the card digitally. You can use Digital Photo Professional (EOS software) to process RAW movies. You can make various adjustments to images depending upon how they will be used and can generate JPEG, HEIF, or other types of images reflecting the effects of those adjustments. Caution RAW movies cannot be processed with [ : RAW image processing]. 276