利用HTML5的Video进行视频截图并保存到本地

2022-05-14 21:44:51
<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>Video视频截图</title>

<style>

body, h1, h2, p { margin:0; padding:0; }

html { font-family:"微软雅黑"; background-color:#e9e9e9; }

h1 { font-size:24px; font-weight:normal; padding:20px 0; text-align:center; color:#858585; background:-webkit-linear-gradient(rgba(0, 186, 255, .8), rgba(0, 130, 255, .8)); border-bottom:1px solid #009cff; color:#FFF; margin-bottom:50px; }

video { display:block; margin:0 auto 30px auto; }

canvas { display:none; }

button { display:block; width:480px; height:50px; font-size:24px; margin:0 auto; border:1px solid #0085ff; color:#FFF; background:-webkit-linear-gradient(rgba(80, 170, 255, .8), rgba(0, 132, 255, .8)); cursor:pointer; border-radius:5px; margin-bottom:30px; }

button:hover { background:-webkit-linear-gradient(rgba(0, 132, 255, .8), rgba(80, 170, 255, .8)); border-color:#1988ff; }

h2, p { width:480px; margin:0 auto; color:#858585; }

h2 { margin-bottom:1em; font-size:18px; }

p { font-size:14px; line-height:24px; }

</style>

<script>

window.onload = function () {

  var button = document.querySelectorAll('.screen')[0];

  var video = document.querySelectorAll('video')[0];

  var canvas = document.querySelectorAll('canvas')[0];

  var ctx = canvas.getContext('2d');

  var width = 480;

  var height = 270;

  canvas.width = width;

  canvas.height = height;

  video.src = 'video/temp.mp4?t=' + new Date().getTime();

  video.width = width;

  video.height = height;

  video.controls = true;

  video.autoplay = true;

  video.loop = true;

  button.onclick = function () {

    ctx.drawImage(video, 0, 0, width, height);  // 将video中的数据绘制到canvas里

    saveImage(canvas, 'screen_' + new Date().getTime() + '.png');  // 存储图片到本地

  };

};

function saveImage (canvas, filename) {

  var image = canvas.toDataURL('image/png').replace('image/png', 'image/octet-stream');

  saveFile(image, filename || 'file_' + new Date().getTime() + '.png');

}

function saveFile(data, filename) {

  var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');

  save_link.href = data;

  save_link.download = filename;

  var event = document.createEvent('MouseEvents');

  event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);

  save_link.dispatchEvent(event);

}

</script>

</head>

<body>

<h1>Video视频截图</h1>

<video>仅支持H264格式MP4</video>

<canvas></canvas>

<button class="screen">截图</button>

<h2>当前，video 元素支持三种视频格式：</h2>

<p>Ogg = 带有 Theora 视频编码和 Vorbis 音频编码的 Ogg 文件</p>

<p>MPEG4 = 带有 H.264 视频编码和 AAC 音频编码的 MPEG 4 文件</p>

<p>WebM = 带有 VP8 视频编码和 Vorbis 音频编码的 WebM 文件</p>

</body>

</html>
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