Canon EOS R5 Mark II Advanced User's Manual page 473

HDMI RAW output
Set to [On] for RAW movie output at resolutions up to 8K from the HDMI terminal to
compatible devices.
As recording begins, movies are also recorded to card (if it is in the camera) in XF-AVC
format.
You can restrict recording to external recording devices when card is not inserted by
setting [Rec Command] to [On] ( ).
Set the movie recording quality in [ : Movie rec. size] ( ).
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