Parece que todo está bien, pero tengo un error. ¡No puedo encontrar el error de donde viene! Espero que alguien pueda ayudarme aquí, por favor https://gabrieltanner.org/blog/webrtc-video-broadcast

El error es SyntaxError no detectado:

El identificador 'video' ya ha sido declarado

Broadcast.js :

 const peerConnections = {}; const config = { iceServers: [ { "urls": "stun:stun.l.google.com:19302", }, // { // "urls": "turn:TURN_IP?transport=tcp", // "username": "TURN_USERNAME", // "credential": "TURN_CREDENTIALS" // } ] }; const socket = io.connect(window.location.origin); const video = document.querySelector('video'); const constraints = { video: {facingMode: "user"} }; navigator.mediaDevices .getDisplayMedia(constraints) .then(stream => { video.srcObject = stream; socket.emit("broadcaster"); }) .catch(error => console.error(error)); socket.on("watcher", id => { const peerConnection = new RTCPeerConnection(config); peerConnections[id] = peerConnection; let stream = video.srcObject; stream.getTracks().forEach(track => peerConnection.addTrack(track, stream)); peerConnection.onicecandidate = event => { if (event.candidate) { socket.emit("candidate", id, event.candidate); } }; peerConnection .createOffer() .then(sdp => peerConnection.setLocalDescription(sdp)) .then(() => { socket.emit("offer", id, peerConnection.localDescription); }); }); socket.on("answer", (id, description) => { peerConnections[id].setRemoteDescription(description); }); socket.on("candidate", (id, candidate) => { peerConnections[id].addIceCandidate(new RTCIceCandidate(candidate)); }); socket.on("disconnectPeer", id => { peerConnections[id].close(); delete peerConnections[id]; }); window.onunload = window.onbeforeunload = () => { socket.close(); };