Canon EOS-1D X Mark III Advanced User's Manual page 276

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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

] is selected, movies are recorded as RAW movie files (file extension

(file extension ".MP4"). This file format provides higher compatibility for playback than

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.

RAW movies cannot be processed with [

] is selected, movies are recorded as MP4 movie files

: RAW image processing].

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