js截取video标签图片
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>
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