前端视频截图方法canvas.drawImage() 

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
</head>
<body>
    <div><button onclick="getVideoImg()">获取视频图片</button></div>
    <div><img src="" id="testImg" /></div>
</body>
<script type="text/javascript">
    function getVideoImg() {
        var url = "https://xxxxx/test.mp4";  //你的视频地址       
        return new Promise(function (resolve, reject) {
            let dataURL = '';
            let video = document.createElement("video");
            video.setAttribute('crossOrigin', 'anonymous');//处理跨域
            video.setAttribute('src', url);
            video.setAttribute('width', 400);
            video.setAttribute('height', 240);
            video.setAttribute('preload', 'auto');
            video.addEventListener('loadeddata', function () {
                let canvas = document.createElement("canvas"),
                width = video.width, //canvas的尺寸和图片一样
                height = video.height;
                canvas.width = width;
                canvas.height = height;
                canvas.getContext("2d").drawImage(video, 0, 0, width, height); //绘制canvas
                setTimeout(function () {
                    dataURL = canvas.toDataURL('image/jpeg'); //转换为base64
                    console.log(dataURL)
                    $("#testImg").attr("src", dataURL);
                    resolve(dataURL);
                }, 2000);
            });
        })
    }
</script>
</html>

 

posted @ 2022-07-26 16:20  hellocjr  阅读(624)  评论(0)    收藏  举报