simple-demos/ondataavailable.html

<style>
    html, body {
        margin: 0!important;
        padding: 0!important;
    }
</style>

<title>ondataavailable | get Intervals based blobs using RecordRTC | RecordRTC</title>
<h1>ondataavailable | get Intervals based blobs using RecordRTC</h1>

<br>

<button id="btn-start-recording">Start Recording</button>
<button id="btn-stop-recording" disabled>Stop Recording</button>

<hr>
<video controls autoplay playsinline></video>

<script src="/RecordRTC.js"></script>
<script>
var video = document.querySelector('video');

function captureCamera(callback) {
    navigator.mediaDevices.getUserMedia({ audio: true, video: true }).then(function(camera) {
        callback(camera);
    }).catch(function(error) {
        alert('Unable to capture your camera. Please check console logs.');
        console.error(error);
    });
}

function stopRecordingCallback() {
    video.src = video.srcObject = null;
    var blob = new File(blobs, 'video.webm', {
        type: 'video/webm'
    });
    video.src = URL.createObjectURL(blob);
    recorder.camera.stop();
    recorder = null;
}

var recorder; // globally accessible

var h1 = document.querySelector('h1');
var blobs = [];

document.getElementById('btn-start-recording').onclick = function() {
    this.disabled = true;
    captureCamera(function(camera) {
        video.srcObject = camera;

        recorder = RecordRTC(camera, {
            recorderType: MediaStreamRecorder,
            mimeType: 'video/webm',
            timeSlice: 1000, // pass this parameter
            // getNativeBlob: true,
            ondataavailable: function(blob) {
                blobs.push(blob);

                var size = 0;
                blobs.forEach(function(b) {
                    size += b.size;
                });

                h1.innerHTML = 'Total blobs: ' + blobs.length + ' (Total size: ' + bytesToSize(size) + ')';
            }
        });

        recorder.startRecording();

        // release camera on stopRecording
        recorder.camera = camera;

        document.getElementById('btn-stop-recording').disabled = false;
    });
};

document.getElementById('btn-stop-recording').onclick = function() {
    this.disabled = true;
    recorder.stopRecording(stopRecordingCallback);
};
</script>

<footer style="margin-top: 20px;"><small id="send-message"></small></footer>
<script src="https://www.webrtc-experiment.com/common.js"></script>