1、需求:上傳視頻,同時截取視頻某一幀做爲視頻的封面。
2、實現思路:利用canvas繪製圖像的功能,繪製圖像某一幀,這裏繪製了第一幀,很簡單就實現了。
3、代碼:
<!DOCTYPE html>
<html>javascript
<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");//轉換成base64圖片,地址拿出來就能夠直接使用 container.appendChild(img); }; initialize(); })(); </script> </body>
</html>css