Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 341)

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General Movie Shooting Cautions
Red < E > Internal Temperature Warning Icon
If the camera’s internal temperature increases due to prolonged movie
shooting or under a high ambient temperature, a red <
E > icon will
appear.
The red < E > icon indicates that movie shooting will soon be terminated
automatically. If this happens, you will not be able to shoot again until the
camera’s internal temperature decreases. Turn off the power and let the
camera rest for a while.
Shooting a movie at a high temperature for a prolonged period will cause
the <
E > icon to appear earlier. When you are not shooting, always turn
off the camera.
Recording and Image Quality
If the attached lens has an Image Stabilizer and you set the Image
Stabilizer (IS) switch to <
1 >, the Image Stabilizer will operate at all
times even if you do not press the shutter button halfway. The Image
Stabilizer consumes battery power and may shorten the total movie
shooting time depending on the shooting conditions. If you use a tripod
or if the Image Stabilizer is not necessary, it is recommended that you set
the IS switch to <
2 >.
With autoexposure shooting or shutter-priority AE, if the brightness
changes during movie shooting, the movie may freeze momentarily. In
such a case, shoot movies with aperture-priority AE or manual exposure.
If there is a very bright light source in the image, the bright area may
appear black on the LCD monitor. The movie will be recorded almost
exactly as it appears on the LCD monitor.
In low light, noise or irregular colors may appear in the image. The movie
will be recorded almost exactly as it appears on the LCD monitor.
If you play back a movie with other devices, image or sound quality may
deteriorate or playback may not be possible (even if the devices support
MOV/MP4 format).