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That's way more computationally expensive and only available if the camera is on (and the user's mouth is visible).

That’s true. I’ve never tried it with the camera off.

Probably the user experience would not be as good, though, since it'd be an audio-only feature that only works if you've enabled video.

The solution is obvious: have the camera watch you even when it's "off".

:-)

That is for the "You are talking, but others can't see your face" notification.

"We can see that you are talking. Would you like others in the meeting to see you as well?"

- Is device X receiving input

vs

- Training models, wasting years of CPU cycle world wide, &c.

For such a dumb feature... I just don't see the point