Must be used with
broadcast, but the director doesn't need to be the designated broadcaster.
The Electron Capture app should work to allow for webp-based broadcasting even if the tab is not visible, as tab throttling is disabled with that application. This is essentially a stream of webp-based images sent over the webRTC data-channels. The quality by default is limited in both frame rate and resolution, as this custom video codec is very inefficient at higher resolutions and frame-rates.
Based on my testing, the webp mode is only efficient if you are keeping the bitrates under like 2mbps, so the higher qualities make little sense IMO outside of some niche use cases as they use up a lot of bandwidth.