Canon 1D X - Manual (Page 233)

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With [z4: Movie rec. size], you can set
the movie’s image size, frame rate per
second, and compression method. The
frame rate switches automatically
depending on the [53: Video system]
setting.
Image size
A
[1920x1080] : Full High-Definition (Full HD) recording quality.
The aspect ratio will be 16:9.
B [1280x720] : High-Definition (HD) recording quality.
The aspect ratio will be 16:9.
C [640x480] : Standard-definition recording quality.
The aspect ratio will be 4:3.
Frame rate (fps: frames per second)
6
/8 : For areas where the TV format is NTSC (North America,
Japan, Korea, Mexico, etc.).
5 /7 : For areas where the TV format is PAL (Europe, Russia,
China, Australia, etc.).
4 : Mainly for motion pictures.
Compression method
X
IPB : Efficiently compresses multiple frames at a
time for recording. Since the file size will be
smaller than with ALL-I, you can shoot longer
.
W ALL-I (I-only) : Compresses one frame at a time for recording.
Although the file size will be bigger than with
IPB, the movie will be more suited for editing.
3 Setting the Movie-Recording Size
COP
Y