Js 录制屏幕
2019-07-02 本文已影响0人
1缥缈的云1
最新的Js录制屏幕主要通过getDisplayMedia({video:true, audio:true})来实现。audio:true表示要录制背景音。目前仅最新的chrome录制tab时支持。效果如下图：
风景
index.html 如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS教程(https://www.jianshu.com/u/0099dbb879da)</title>
</head>
<body>
<video id= "video" width="320" height="240" controls autoplay src="https://www.runoob.com/try/demo_source/movie.mp4">
<object data="movie.mp4" width="320" height="240">
<embed width="320" height="240" src="movie.swf">
</object>
</video>
<button type="button" onclick="recordScreen()">Start</button>
<script src='index.js'></script>
<script>
function recordScreen(){
var recorder = new Recorder("test.mp4");
recorder.startRecord();
let t = setTimeout(function(){
recorder.stopRecord();
clearTimeout(t);
},10000)
}
</script>
</body>
</html>
index.js如下：
/**
*自动录屏模块*录制桌面
*
* @class Recorder
*/
class Recorder {
constructor(path) {
this.mediaOutputPath = path;
}
/**
*开始录制
*
* @memberof Recorder
*/
startRecord (){
navigator.mediaDevices.getDisplayMedia({video:true, audio:true}).then(Mediastream => {
this.createRecorder(Mediastream);
}).catch(err => {
this.getUserMediaError(err);
})
}
/**
*获取媒体源失败
*
* @memberof Recorder
*/
getUserMediaError(err){
console.log('mediaError',err);
}
/**
*开始视频录制
*
* @memberof Recorder
*/
createRecorder(stream){
console.log('start record');
this.recorder = new MediaRecorder(stream);
this.recorder.start();
var chunks = [];
this.recorder.onstop = event => {
let blob = new Blob(chunks, {
type: 'video/mp4'
});
this.saveMedia(blob);
}
this.recorder.ondataavailable = event => {
chunks.push(event.data);
};
}
/**
*数据转换并保存成MP4
*
* @memberof Recorder
*/
saveMedia(blob){
let url = window.URL.createObjectURL(blob);
var video = document.getElementById("video");
video.src = url;
// var a = document.createElement('a');
// a.innerHTML = "test";
// a.download = "test.mp4";
// a.href = url;
// document.body.appendChild(a);
}
/**
*停止录制视频
*
* @memberof Recorder
*/
stopRecord(){
this.recorder.stop();
}
}
