Why the function "onaddstream" is never called? - webrtc

Question

Hello I followed this tutorial to create a simple webrtc example.
https://www.webrtc-experiment.com/docs/WebRTC-PeerConnection.html .
So look my JFFiddle:
https://jsfiddle.net/xzspquew/9/
and tell me please why I can't enter to the function onaddstream ? The console.log("this function is called") is neved called. Why ?
navigator.getUserMedia({audio:false, video:true}, success, error)
var pc = new RTCPeerConnection()
var pc2 = new RTCPeerConnection()
pc.onaddstream = function(event) {
console.log("this function is called")
var video2 = document.getElementById("video2")
video2.src = window.URL.createObjectURL(event.stream)
video2.play()
}
document.querySelector("#repondre").addEventListener('click', function repondre() {
var answer = prompt("Please enter your sdp remote offer");
console.log(answer)
pc2.setRemoteDescription(JSON.parse(answer))
pc2.createAnswer(successanswerrtc, errorrtc)
})
function successanswerrtc(answersdp) {
pc2.setLocalDescription(answersdp)
console.log(JSON.stringify(answersdp))
pc.setRemoteDescription(answersdp)
}
function sucessrtc(offersdp) {
pc.setLocalDescription(offersdp)
alert(JSON.stringify(offersdp))
console.log(JSON.stringify(offersdp))
}
function errorrtc(err) {
console.log("error" + err)
}
function success(stream) {
var video1 = document.getElementById("video1")
video1.src = window.URL.createObjectURL(stream)
video1.play()
pc.createOffer(sucessrtc, errorrtc)
}
function error() {
console.log("error")
}

Answer 1

That tutorial appears to be outdated. Perhaps https://webrtc.org/start/#demos-and-samples
According to MDN documentation, it has been deprecated:
https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/onaddstream
This property has been removed from the specification; you should now use RTCPeerConnection.ontrack to watch for track events instead. It is included here in order to help you adapt existing code and understand existing samples, which may not be up-to-date yet.

Answer 2

It looks you are trying with an outdated demo,
Try this demo from WebRTC official samples
In your fiddle you didn't handled the candidates & streams properly .
If you are making a call from pc to pc2, you need to add stream to pc by calling pc.addstream(stream) then pc2.onaddstream or pc2.onaddtrack method will triggered.
I updated your fiddle https://jsfiddle.net/8mchrc3v/1/