[dmazzoni]

They join a 3rd-party meeting using a browser.

Then they capture the video from the meeting in Chromium.

Then they need to send that captured video to another process for compression and processing.

No, WebSockets isn't the most efficient, but there aren't that many options once you're capturing inside a web page.

[dilyevsky]

Not totally sure but they probably extract video via Chrome DevTools Protocol which uses WebSocket as transport.