I use getDisplayMedia which is a JavaScript API that lets you capture recordings as large as your computer can handle, but the format is fixed to either MP4 or WebM.
replyHere is the JS-based player: https://screenrecorder.me/projects/s3hx9YRgXNsrN1s/player
Here is a video that I rendered: https://screenrecorder.me/player/s3hx9YRgXNsrN1s
There are definitely artifacts, especially in the latter, but in practice the videos I've been creating have been working well. Also, it's primarily because the zoom is so high.
In practice, I usually set the zoom much lower and it doesn't have as much artifacting. Check out the homepage video
Would it also capture system audio? Wasn’t there some security restrictions on that for MacOS
replyAudio capture support apparently available on all desktop browsers except Firefox:
https://developer.mozilla.org/en-US/docs/Web/API/MediaDevice...
replySystem audio (i.e. Zoom calls) can be captured only on Chromium browsers on Windows and ChromeOS when sharing the entire screen; tab audio has wider OS support; Safari and Firefox do not support system or tab audio capture https://addpipe.com/docs/recording-client/screen-recording/#...
replyThe MDN support table does not differentiate in this regard. (le: it actually does if you click to see the implementation notes)