Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Setting the Movie Recording Quality
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At HD quality, you can shoot movies at a high frame rate of 119.9 fps or 
100.0 fps. Good for shooting movies to be played back in slow motion. 
The maximum recording time of one movie clip is 7 min. 29 sec.
The movie will be recorded as w2 
W D
 or w3 W D.
Movie Servo AF will not work for high 
frame rate movie shooting. Also, during 
high frame rate movie shooting, AF will 
not work.
High Frame Rate movies do not record 
sound.
If the time code is displayed during movie shooting, it will count up 4 
sec. for each sec. in real time.
Since the High Frame Rate movie will be recorded as a 29.97 fps/25.00 
fps movie file, it will be played back in slow motion at 1/4 speed.
High Frame Rate
Cautions for [High Frame Rate: Enable]
 
When [Count up] is set to [Free run] under [z5: Time code] (p.365)
the time code will not be recorded.
 
[MOV/MP4], [Movie rec. size], and [24.00p] cannot be set.
 
Even if you set it back to [Disable], the movie recording size will not 
revert to the original setting. Set the movie recording size again.
 
If you shoot a High Frame Rate movie under fluorescent or LED lighting, 
the movie image may flicker.
 
When you start or stop High Frame Rate movie shooting, the movie 
image will not be updated temporarily (frame stops momentarily). Be 
aware of this when using an external recording device to record the 
movie from the HDMI video output.
 
During the High Frame Rate movie shooting, the frame rate of the movie 
image displayed on the LCD monitor is different from the frame rate of 
the movie image being recorded.
 
Headphones cannot be used. (You cannot listen to the sound.)