js獲取視頻截圖
阿新 • • 發佈：2018-08-22
ntb tput ini contex segment 透明圖 init append source
參考：
https://segmentfault.com/q/1010000006717959
問題：
a.獲取的好像是第一幀的圖？第一幀為透明圖時，獲取的個透明圖片
b.得先加載視頻到video,做視頻上傳的時候體驗不太友好
c.qq空間能截取視頻圖片，不知道怎麽實現的
<!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> 視頻第一幀圖片： <div id="output"></div> <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>
js獲取視頻截圖