記録のために、私もこれについて十分な知識を持っていません、 
しかし、私はこれをGitハブで見つけました- 
<!DOCTYPE html>
 <html>
<head>
  <title>XSockets.WebRTC Client example</title>
  <meta charset="utf-8" />
<style>
body {
  }
.localvideo {
position: absolute;
right: 10px;
top: 10px;
}
.localvideo video {
max-width: 240px;
width:100%;
margin-right:auto;
margin-left:auto;
border: 2px solid #333;
 }
 .remotevideos {
height:120px;
background:#dadada;
padding:10px; 
}
.remotevideos video{
max-height:120px;
float:left;
 }
</style>
</head>
<body>
<h1>XSockets.WebRTC Client example </h1>
<div class="localvideo">
    <video autoplay></video>
</div>
<h2>Remote videos</h2>
<div class="remotevideos">
</div>
<h2>Recordings  ( Click on your camera stream to start record)</h2>
<ul></ul>
<h2>Trace</h2>
<div id="immediate"></div>
<script src="XSockets.latest.js"></script>
<script src="adapter.js"></script>
<script src="bobBinder.js"></script>
<script src="xsocketWebRTC.js"></script>
<script>
    var $ = function (selector, el) {
        if (!el) el = document;
        return el.querySelector(selector);
    }
    var trace = function (what, obj) {
        var pre = document.createElement("pre");
        pre.textContent = JSON.stringify(what) + " - " + JSON.stringify(obj || "");
        $("#immediate").appendChild(pre);
    };
    var main = (function () {
        var broker;
        var rtc;
        trace("Ready");
        trace("Try connect the connectionBroker");
        var ws = new XSockets.WebSocket("wss://rtcplaygrouund.azurewebsites.net:443", ["connectionbroker"], {
            ctx: '23fbc61c-541a-4c0d-b46e-1a1f6473720a'
        });
        var onError = function (err) {
            trace("error", arguments);
        };
        var recordMediaStream = function (stream) {
            if ("MediaRecorder" in window === false) {
                trace("Recorder not started MediaRecorder not available in this browser. ");
                return;
            }
            var recorder = new XSockets.MediaRecorder(stream);
            recorder.start();
            trace("Recorder started.. ");
            recorder.oncompleted = function (blob, blobUrl) {
                trace("Recorder completed.. ");
                var li = document.createElement("li");
                var download = document.createElement("a");
                download.textContent = new Date();
                download.setAttribute("download", XSockets.Utils.randomString(8) + ".webm");
                download.setAttribute("href", blobUrl);
                li.appendChild(download);
                $("ul").appendChild(li);
            };
        };
        var addRemoteVideo = function (peerId, mediaStream) {
            var remoteVideo = document.createElement("video");
            remoteVideo.setAttribute("autoplay", "autoplay");
            remoteVideo.setAttribute("rel", peerId);
            attachMediaStream(remoteVideo, mediaStream);
            $(".remotevideos").appendChild(remoteVideo);
        };
        var onConnectionLost = function (remotePeer) {
            trace("onconnectionlost", arguments);
            var peerId = remotePeer.PeerId;
            var videoToRemove = $("video[rel='" + peerId + "']");
            $(".remotevideos").removeChild(videoToRemove);
        };
        var oncConnectionCreated = function () {
            console.log(arguments, rtc);
            trace("oncconnectioncreated", arguments);
        };
        var onGetUerMedia = function (stream) {
            trace("Successfully got some userMedia , hopefully a goat will appear..");
            rtc.connectToContext(); 
        };
        var onRemoteStream = function (remotePeer) {
            addRemoteVideo(remotePeer.PeerId, remotePeer.stream);
            trace("Opps, we got a remote stream. lets see if its a goat..");
        };
        var onLocalStream = function (mediaStream) {
            trace("Got a localStream", mediaStream.id);
            attachMediaStream($(".localvideo video "), mediaStream);
            
            $(".localvideo video ").addEventListener("click", function () {
                recordMediaStream(rtc.getLocalStreams()[0]);
            });
        };
        var onContextCreated = function (ctx) {
            trace("RTC object created, and a context is created - ", ctx);
            rtc.getUserMedia(rtc.userMediaConstraints.hd(false), onGetUerMedia, onError);
        };
        var onOpen = function () {
            trace("Connected to the brokerController - 'connectionBroker'");
            rtc = new XSockets.WebRTC(this);
            rtc.onlocalstream = onLocalStream;
            rtc.oncontextcreated = onContextCreated;
            rtc.onconnectioncreated = oncConnectionCreated;
            rtc.onconnectionlost = onConnectionLost;
            rtc.onremotestream = onRemoteStream;
            rtc.onanswer = function (event) {
            };
            rtc.onoffer = function (event) {
            };
        };
        var onConnected = function () {
            trace("connection to the 'broker' server is established");
            trace("Try get the broker controller form server..");
            broker = ws.controller("connectionbroker");
            broker.onopen = onOpen;
        };
        ws.onconnected = onConnected;
    });
    document.addEventListener("DOMContentLoaded", main);
</script>
私の場合の行番号89で、コードOnrecordCompleteは実際にレコーダーファイルのリンクを追加します。そのリンクをクリックするとダウンロードが開始され、サーバーへのパスをファイルとして保存できます。 
録音コードは次のようになります
recorder.oncompleted = function (blob, blobUrl) {
                trace("Recorder completed.. ");
                var li = document.createElement("li");
                var download = document.createElement("a");
                download.textContent = new Date();
                download.setAttribute("download", XSockets.Utils.randomString(8) + ".webm");
                download.setAttribute("href", blobUrl);
                li.appendChild(download);
                $("ul").appendChild(li);
            };
blobUrlはパスを保持します。私はこれで私の問題を解決しました、誰かがこれが役に立つと思うことを願っています