Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 691

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
HDMI Settings: 24p/60p Output (movie) (Only for 1080 60i compatible models)
You can set 1080/24p or 1080/60p as the HDMI output format when [
or [24p 100M].
MENU → (Setup) → [HDMI Settings] → [HDMI Resolution] → [1080p].
1
MENU → (Setup) → [HDMI Settings] → [
2
Menu item details
60p:
Movies are output as 60p.
24p:
Movies are output as 24p.
Note
Steps 1 and 2 can be set in either order.
Related Topic
Record Setting (movie)
24p/60p Output] → desired setting.
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600
Record Setting] is set to [24p 50M], [24p 60M]