[ambyjkl]

If you're on linux, you most likely need the H.264 ffmpeg codec package and things like the Cisco OpenH264 plugin for Firefox. Also, try unblocking WebRTC if you block it

[me_bx]

Thanks. I just checked and all of these are installed / enabled.

Still, only a black rectangle is shown (also disabled ad blocker).

There are a couple of _warning_ messages in the dev console though, which might explain the origin of the issue:

> An AudioContext was prevented from starting automatically. It must be created or resumed after a user gesture on the page.

> Autoplay is only allowed when approved by the user, the site is activated by the user, or media is muted.