Stream
A headless broadcast rig: a real browser renders a live web app onto a virtual display, and one encode of that display goes out to every destination at once.
A virtual X display, a headless browser drawing on it, a userspace audio sink, and one x264 encode fanned out through ffmpeg's tee muxer with a failed leg ignored rather than fatal. The operator's preview reads the same framebuffer as the encoder, so the two cannot drift. Producer Studio, its control room, is Python standard library with a server-side action whitelist. Running continuously against one application; not published, and no licence chosen yet.