Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 311)

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With [ z 4: Movie rec quality ], you can
set the movie-recording format, movie-
recording size (movie size, frame rate,
movie-recording format, compression
rate), and other functions.
The frame rate displayed on the [
Movie
rec. size ] screen switches automatically
depending on the [ 5 3: Video system ]
setting (p.499).
You can select the movie’s recording format.
MOV
The movie will be recorded in the
MOV format (file extension “.MOV”).
Convenient for editing with a
computer.
MP4
The movie will be recorded in the MP4 format (file extension
“.MP4”). This file format is compatible with a much larger range of
playback systems than with MOV files.
3
Setting the Movie Recording Quality
MOV/MP4
The card’s writing and reading speeds required for recording movies
will differ depending on the movie-recording quality. Before shooting
movies, see page 316 to check the performance requirements of the
card.
When [ MP4 ] is set, [ High Frame Rate ] cannot be set.