Panasonic LUMIX DC-G9M2 Operating Instructions Manual page 464

HDMI Output (Video) – HDMI Output Image Quality
•
When set to a [Rec Quality] other than 16:9 or 17:9, bands are added to the
images and they are output with a 16:9 aspect ratio.
•
When the video frame rate is 200p or more, using the following functions will stop
HDMI output:
– Wi-Fi connection with a smartphone
– Tethered recording

[iA]/[P]/[A]/[S]/[M] Mode
Output is the same as [
Output is with a 16:9 aspect ratio during recording standby. Resolution,
frame rate, YUV, and bit value output matches the connected device.
•
When set to any [Aspect Ratio] other than 16:9, bands are added to the images
and they are output with a 16:9 aspect ratio.
]/[S&Q] mode during video recording.
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