Streaming via WHIP to OpenVibe

WHIP endpoint: `https://openre.stream/whip/<stream-key>`. POST an SDP offer to this URL with Content-Type: application/sdp. The server responds with an SDP answer and ICE candidates.

OBS 30+ WHIP setup: Settings > Stream > Service: Custom > WHIP URL: `https://openre.stream/whip/<your-stream-key>`. Leave bearer token blank for stream-key auth.

Browser streaming: use the dashboard at openre.stream/dashboard. Click "Start Streaming" to use navigator.mediaDevices.getUserMedia() + RTCPeerConnection for WHIP negotiation automatically.

FFmpeg WHIP: `ffmpeg -re -i input.mp4 -c:v libx264 -c:a aac -f whip https://openre.stream/whip/<stream-key>`. Requires FFmpeg 7.0+ built with WHIP support.