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How to stream

Streaming credentials are shared via IRC — ask there for the current publish URL/password. This is a single shared stream: whoever is currently publishing is what everyone sees.

OBS Studio works great on any OS (Linux/X11, Wayland, macOS, Windows) and is the easiest option for most people — screen/window capture, audio mixing, and encoder settings are all handled in the UI. If you'd rather use a terminal-only workflow, ffmpeg one-liners are also available below depending on your setup.

Option A: OBS Studio

1. Open OBS, go to Settings → Stream, set Service to Custom..., and paste the full URL you were given into the Server field, leaving Stream Key empty.
2. Add your capture sources (screen/window/game capture + audio) as normal, then click Start Streaming.

Option B: ffmpeg one-liner (Linux, X11)

If you're on X11 (or a Wayland session with Xwayland exposing :0.0), this captures your screen + default audio directly, no extra tools needed:

ffmpeg -f x11grab -framerate 30 -i :0.0 -f pulse -i default -c:v libx264 -preset ultrafast -tune zerolatency -pix_fmt yuv420p -c:a aac -b:a 128k -f flv "<url you were given>"

-preset ultrafast keeps CPU usage low for real-time software encoding — if you're dropping frames on a weaker machine, try lowering -framerate (e.g. 20) rather than the resolution, which tends to look better for the same CPU savings. If you have a GPU with VAAPI support, hardware encoding is far less CPU-intensive — replace the video input/encode portion with:

ffmpeg -vaapi_device /dev/dri/renderD128 -f x11grab -framerate 30 -i :0.0 -f pulse -i default -vf 'format=nv12,hwupload' -c:v h264_vaapi -b:v 4M -c:a aac -b:a 128k -f flv "<url you were given>"

(adjust /dev/dri/renderD128 if you have multiple GPUs — check ls /dev/dri.) RTMP/FLV requires H.264 video and AAC audio — some distro ffmpeg builds (e.g. Slackware) ship without these encoders for licensing reasons; check with ffmpeg -encoders | grep -E "libx264|aac", or use OBS instead, which bundles its own encoder support.

Option C: ffmpeg with a file/other source

For rebroadcasting a pre-recorded file or another running stream instead of capturing your screen:

ffmpeg -re -i input -c:v libx264 -c:a aac -f flv "<url you were given>"

On Wayland (non-X11) screen capture generally needs a portal/PipeWire flow rather than a single ffmpeg command — OBS handles this transparently across compositors, which is why it's the recommended option there.