video recording api js code example

Example 1: stream recording javascript

<!DOCTYPE html>
<html>
<head>

<script type="text/javascript">

function enter() {

    if (navigator.mozGetUserMedia) { 
       navigator.myGetMedia=navigator.mozGetUserMedia;
       navigator.myGetMedia({video: true}, connect, error); 
    } 
    else {
       alert("NO");
    }

    function connect(stream) {

        var video = document.getElementById("my_video");
            video.src = window.URL ? window.URL.createObjectURL(stream) : stream;
            video.play();

        var canvas = document.getElementById("c"); 
    }

    function error(e) { console.log(e); }

}

</script>

</head>    
<body>
    <canvas width="640" height="480" id="c"></canvas>
    <input type="button" value="RECORD" onClick="enter()"/>
    <input type="button" value="SAVE" />
    <video id="my_video" width="640" height="480"/>
</body>
</html>

Example 2: media recorder

if (navigator.mediaDevices) {
  console.log('getUserMedia supported.');

  var constraints = { audio: true };
  var chunks = [];

  navigator.mediaDevices.getUserMedia(constraints)
  .then(function(stream) {

    var mediaRecorder = new MediaRecorder(stream);

    visualize(stream);

    record.onclick = function() {
      mediaRecorder.start();
      console.log(mediaRecorder.state);
      console.log("recorder started");
      record.style.background = "red";
      record.style.color = "black";
    }

    stop.onclick = function() {
      mediaRecorder.stop();
      console.log(mediaRecorder.state);
      console.log("recorder stopped");
      record.style.background = "";
      record.style.color = "";
    }

    mediaRecorder.onstop = function(e) {
      console.log("data available after MediaRecorder.stop() called.");

      var clipName = prompt('Enter a name for your sound clip');

      var clipContainer = document.createElement('article');
      var clipLabel = document.createElement('p');
      var audio = document.createElement('audio');
      var deleteButton = document.createElement('button');
     
      clipContainer.classList.add('clip');
      audio.setAttribute('controls', '');
      deleteButton.innerHTML = "Delete";
      clipLabel.innerHTML = clipName;

      clipContainer.appendChild(audio);
      clipContainer.appendChild(clipLabel);
      clipContainer.appendChild(deleteButton);
      soundClips.appendChild(clipContainer);

      audio.controls = true;
      var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
      chunks = [];
      var audioURL = URL.createObjectURL(blob);
      audio.src = audioURL;
      console.log("recorder stopped");

      deleteButton.onclick = function(e) {
        evtTgt = e.target;
        evtTgt.parentNode.parentNode.removeChild(evtTgt.parentNode);
      }
    }

    mediaRecorder.ondataavailable = function(e) {
      chunks.push(e.data);
    }
  })
  .catch(function(err) {
    console.log('The following error occurred: ' + err);
  })
}

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