Panasonic LUMIX DC-GH6 Owner's Manual page 417

Special Video Recording – Variable Frame Rate
Available Frame Rate Setting Ranges
The frame rate you can set differs depending on the [Rec Quality] settings.
[Rec Quality]
C4K/4K video that uses the Long GOP
image compression system
5.7K video/C4K/4K video that use the
ALL-Intra image compression system
FHD video that uses the Long GOP
image compression system
FHD video that uses the ALL-Intra
image compression system
1 fps to 120 fps
1 fps to 300 fps
1 fps to 240 fps
417
Frame rate
1 fps to 60 fps