Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 401)

Pre-Recording Setting
With pre-recording, automatic movie recording is already in progress a specified amount of
time before you manually start recording.
This preliminary recording is referred to as pre-recording. The camera pre-records
automatically during standby in movie recording mode.
1.
Select [ : Pre-recording set.].
2.
Select [Pre-recording].
Select [ On ].
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