【转载】用原生JS和html5进行视频截图并保存到本地

支持并尊重原创！原文地址：http://www.cnblogs.com/xieshuxin/p/6731637.html
 <!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"; }

         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 = 'movie.mp4?t=' + new Date().getTime();

             video.width = width;

             video.height = height;

             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) {

             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>
巴特西

【转载】用原生JS和html5进行视频截图并保存到本地

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