移动端 如何在video上显示视频的第一帧？能写下具体代码吗？ 谢谢了
认证高级PHP讲师
video标签有个poster属性，事先截好封面放进去就行
是啊 但是怎么截呢 前端能实现吗？
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> </head> <body> <video id="video" controls="controls" width="400" height="300"> <source src="myvideo.mp4"> </video> <br><br> 视频第一帧图片： <p id="output"></p> <script type="text/javascript"> (function(){ var video, output; var scale = 0.8; var initialize = function() { output = document.getElementById("output"); 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"); img.width = 400; img.height = 300; output.appendChild(img); }; initialize(); })(); </script> </body> </html>
http://stackoverflow.com/ques...
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video标签有个poster属性，事先截好封面放进去就行
是啊 但是怎么截呢 前端能实现吗？
http://stackoverflow.com/ques...