Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 276)

Compression method
[ ] RAW (Light)
Since the movie is recorded at a bit rate lower than with RAW (Standard), the file size
will be smaller than with RAW (Standard) and the playback compatibility will be higher.
This will make the available recording time longer than with RAW (Standard) (with a
card having the same capacity).
[ ] 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 [ ] or [ ] 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 ].
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