Nikon D500 User Manual page 93

D
The Count-Down Display
A count down will be displayed 30 s before live view ends
automatically (0 53). Depending on shooting conditions, the timer
may appear immediately when movie recording begins. Note that
regardless of the amount of recording time available, live view will still
end automatically when the timer expires. Wait for the internal circuits
to cool before resuming movie recording.
A
Adjusting Settings During Movie Recording
Headphone volume can not be adjusted during recording. If an option
other than I (microphone off ) is currently selected, microphone
sensitivity can be changed to any setting other than I while recording
is in progress.
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