js截取video标签图片

MIKUScallion 2019-12-24

通过js截取video窗口的一帧渲染到canvas。

如果需要保存为图片,只需将canvas保存为图片即可。

canvas保存为图片参考:https://www.cnblogs.com/dch0/p/11698982.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            #localvideo{
                width: 500px;
            }
            #localcanvas{
                width: 500px;
            }
        </style>
    </head>
    <body>
        <video id="localvideo" autoplay="autoplay">
            <source src="http://img.ksbbs.com/asset/Mon_1703/eb048d7839442d0.mp4"></source>
        </video>
        <canvas id="localcanvas" width="1920" height="1080"></canvas>
        <br />
        <button id="snapbtn">截取</button>
    </body>
    <script>
        var video = document.getElementById("localvideo");
        var snapbtn = document.getElementById("snapbtn");
        var canvas = document.getElementById("localcanvas");
        var ctx = canvas.getContext("2d");
        snapbtn.onclick = function(){
            ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
        }
    </script>
</html>

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