Nikon D810 - Manual (Page 295)

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A
Television Playback
Use of an AC adapter and power connector (available separately) is
recommended for extended playback. If the edges of photographs are
not visible in the television display, select 95% for HDMI >
Advanced > Output display size (0 270).
A
HDMI and Live View
When the camera is connected via an HDMI cable, HDMI displays can
be used for live view photography and movie live view (0 48, 59).
Note that if 1920 × 1080; 60p is selected for the Movie settings >
Frame size/frame rate option in the shooting menu (0 62), the
selected setting will only be reflected in the HDMI output during
movie recording if all the following conditions are met: Auto or 1080p
(progressive) is selected for HDMI > Output resolution, 100% is
selected for HDMI > Advanced > Output display size, and Off is
selected for HDMI > Advanced > Live view on-screen display
(0 270). At other settings, the output resolution, display size, or frame
rate may differ from that selected in the camera menus.