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

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 Menu Function Settings
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To continue the HDMI output for longer than 30 min., select [a] or 
[awithout info], then set [52: Auto Power Off] to [Disable] (p.76).
How to prolong the HDMI output
 
HDMI output in 4K quality is not possible. (Even if [Movie rec. size] is set 
to H, the movie will be output in Full HD quality.)
 
HDMI output with no information will not display the card’s remaining 
capacity, battery level, internal temperature warning (p.391), or other 
warnings on the HDMI output device’s screen. Be particularly careful 
when setting [awithout info]. When [A+a] is set, you can see the 
warnings displayed on the camera’s LCD monitor.
 
When you are not shooting a movie, the power will turn off automatically 
after the set time for [52: Auto power off] elapses. If you select 
[A+a] and set [52: Auto power off] to [Disable], the HDMI output 
will stop if you do not operate the camera for 30 min. (movie shooting will 
be cancelled).
 
With [awithout info] set and you press the buttons such as <n> 
or <m>, the setting screen may be displayed in the HDMI video 
output. While recording a movie to an external recording device, 
operating the buttons is not recommended.
 
Depending on the viewing environment, the brightness and color of the 
movie shot with the camera may look different from that of the HDMI 
video output recorded by an external recording device.
 
By pressing the <B> button, you can change the information 
displayed on the screen.
 
A time code can be appended to the HDMI video output (p.367).
 
Sound will also be output for the HDMI output (except when [Sound 
rec.: Disable
] is set).