download video of webcam inmp4 format javascript code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>MediaCapture and Streams API</title>
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="main.css">
</head>
<body>
<header>
<h1>MediaCapture, MediaRecorder and Streams API</h1>
</header>
<main>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit molestiae itaque facere totam saepe tempore esse temporibus, quae reprehenderit aliquid iusto ea laborum, iure eligendi odio exercitationem sapiente illum quos.</p>
<p><button id="btnStart">START RECORDING</button><br/>
<button id="btnStop">STOP RECORDING</button></p>
<video controls></video>
<video id="vid2" controls></video>
<!-- could save to canvas and do image manipulation and saving too -->
</main>
<script>
let constraintObj = {
audio: false,
video: {
facingMode: "user",
width: { min: 640, ideal: 1280, max: 1920 },
height: { min: 480, ideal: 720, max: 1080 }
}
};
// width: 1280, height: 720 -- preference only
// facingMode: {exact: "user"}
// facingMode: "environment"
//handle older browsers that might implement getUserMedia in some way
if (navigator.mediaDevices === undefined) {
navigator.mediaDevices = {};
navigator.mediaDevices.getUserMedia = function(constraintObj) {
let getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (!getUserMedia) {
return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
}
return new Promise(function(resolve, reject) {
getUserMedia.call(navigator, constraintObj, resolve, reject);
});
}
}else{
navigator.mediaDevices.enumerateDevices()
.then(devices => {
devices.forEach(device=>{
console.log(device.kind.toUpperCase(), device.label);
//, device.deviceId
})
})
.catch(err=>{
console.log(err.name, err.message);
})
}
navigator.mediaDevices.getUserMedia(constraintObj)
.then(function(mediaStreamObj) {
//connect the media stream to the first video element
let video = document.querySelector('video');
if ("srcObject" in video) {
video.srcObject = mediaStreamObj;
} else {
//old version
video.src = window.URL.createObjectURL(mediaStreamObj);
}
video.onloadedmetadata = function(ev) {
//show in the video element what is being captured by the webcam
video.play();
};
//add listeners for saving video/audio
let start = document.getElementById('btnStart');
let stop = document.getElementById('btnStop');
let vidSave = document.getElementById('vid2');
let mediaRecorder = new MediaRecorder(mediaStreamObj);
let chunks = [];
start.addEventListener('click', (ev)=>{
mediaRecorder.start();
console.log(mediaRecorder.state);
})
stop.addEventListener('click', (ev)=>{
mediaRecorder.stop();
console.log(mediaRecorder.state);
});
mediaRecorder.ondataavailable = function(ev) {
chunks.push(ev.data);
}
mediaRecorder.onstop = (ev)=>{
let blob = new Blob(chunks, { 'type' : 'video/mp4;' });
chunks = [];
let videoURL = window.URL.createObjectURL(blob);
vidSave.src = videoURL;
}
})
.catch(function(err) {
console.log(err.name, err.message);
});
/*********************************
getUserMedia returns a Promise
resolve - returns a MediaStream Object
reject returns one of the following errors
AbortError - generic unknown cause
NotAllowedError (SecurityError) - user rejected permissions
NotFoundError - missing media track
NotReadableError - user permissions given but hardware/OS error
OverconstrainedError - constraint video settings preventing
TypeError - audio: false, video: false
*********************************/
</script>
</body>
</html>