TL;DR: Using the iPhone videoconferencing app while mounted on top of the Mac Monitor via tripod worked far better. Mac can still join the same meeting simultaneously should screen sharing be needed. In that case, please mute both Mac’s microphone and speakers.
Hey @tjluoma and others, I’ve been trying to do this but with somewhat limited success.
I’m using a 2015 Retina Macbook (adorable!) with an external monitor attached. That monitor had a Logitech C920 cam on it, but I’ve found that Skype calls would start lagging the video after a few minutes of conversation.
The problem seems limited to Skype/MS Teams (Zoom and FaceTime never lag) and it also seems to be restricted to my Logitech C920, as internal webcam (that crappy 480p one) never lags.
Then I began my search for fixes and/or substitutes.
After much trying (and even a somewhat desperate nuke and pave of that MacBook), I’ve got the idea to try to use my iPhone Camera as my default webcam and then, tried @bowline ‘s recommendation EpocCam. It worked fine, but the lag still happens after a while (even when connected via USB).
To this moment, as many of those apps have their own iOS counterparts, I’ve decided to forgo using the iPhone as my webcam route and ended up using it’s own videoconferencing apps while it’s mounted via a tripod on the top of my Mac.
Also, for those occasions where I need to share my screen (say a Keynote presentation or even discussions on a Microsoft Word doc), I’m able to have two simultaneous instances of the app running and logged in, so I would have the iPhone with both my audio and video and my muted Mac (sharing it’s screen) joining that same meeting.
The only thing I miss on that setup is the ability to mute my mic via a keyboard shortcut, but it is still feasible via my mic’s dedicated hardware button (though that does not signals to others in the call I’m muted).
Sorry for writing that long!