一、需求:上传视频,同时截取视频某一帧作为视频的封面。
二、实现思路:利用canvas绘制图像的功能,绘制图像某一帧,这里绘制了第一帧,很简单就实现了。
三、代码:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>capture screen</title> <style type="text/css"> video,#container{width: 300px;height: 200px;} #container>img{width: 100%;} </style> </head> <body> <video id="video" controls="controls"> <source src="video/video_test.mp4"> </video> <div id="container"></div> <script type="text/javascript"> (function() { var video, container; var scale = 0.8; var initialize = function() { container = document.getElementById("container"); video = document.getElementById("video"); video.addEventListener('loadeddata', captureImage); }; var captureImage = function() { var canvas = document.createElement("canvas"); canvas.width = video.videoWidth * scale; canvas.height = video.videoHeight * scale; canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height); var img = document.createElement("img"); img.src = canvas.toDataURL("image/png");//转换成base64图片,地址拿出来就可以直接使用 container.appendChild(img); }; initialize(); })(); </script> </body> </html>
四、本文转载至本人2018年博客
javascript - canvas绘制视频封面 - 个人文章 - SegmentFault 思否
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