Panasonic LUMIX DC-GH6 Owner's Manual page 447

Special Video Recording – [Loop Recording (video)]
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Make sure the camera does not turn off during recording.
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Loop recording cannot start if there is insufficient available capacity on the card.
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When the recording time exceeds 12 hours, recording continues with data being
deleted in order from the point where recording started.
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When [Video File Name] is set to [CINE Style], recording stops when the number
of folders and number of files reach the maximum.
If loop recording is to be done over long periods, we recommend setting [Video
File Name] to [Same As Photo(DCF Standard)].
•
When the following functions are being used, [Loop Recording (video)] is not
available:
– [Rec Quality] with a bit rate of 400 Mbps or more
– [Variable Frame Rate]
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