[英]Extract poster image from video
我想從視頻文件本身中提取我的海報圖像,並希望在網頁上使用該圖像。
我的技術堆棧包括spring mvc,hibernate,jpa,jQuery,jsp,html5,css3。
任何人都可以指導我如何做到這一點?
取決於您想要進行處理的地方,還有幾個選項
預處理選項如果您對視頻進行預處理,您可以使用Grunt生成不同的視頻格式/尺寸/圖像, 網址為https://github.com/sjwilliams/grunt-responsive-videos
客戶端選項如果您想要在客戶端生成它,只要您托管自己的視頻文件,就可以使用Popcorn.capture之類的東西,否則您將遇到同源策略問題。 請參閱https://github.com/rwaldron/popcorn.capture
服務器端選項如果要生成服務器端,Humble-Video https://github.com/artclarke/humble-video是一個用於處理視頻文件的Java框架
正如@sjm所建議的那樣,我玩了Popcorn.capture並嘗試了以下代碼來實現這一目的
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Popcorn.capture.js Functional Examples</title>
<script src="http://cdn.popcornjs.org/code/dist/popcorn.min.js"></script>
<script src="../src/popcorn.capture.js"></script>
</head>
<body onload="myFunction()">
<div id="unmoved-fixture">
<video height="180" width="300" id="video-target" controls>
<source src="assets/popcorntest.mp4"></source>
<source src="assets/popcorntest.ogv"></source>
<source src="assets/popcorntest.webm"></source>
</video>
</div>
<pre>
</pre>
<script>
function myFunction() {
var $pop = Popcorn( "#video-target" ),
poster;
$pop.capture({
at: 10
});
}
</script>
</body>
</html>
上面的代碼從視頻的第10秒開始捕獲圖像,並為視頻創建海報圖像。
您可以從https://github.com/rwaldron/popcorn.capture/tree/master/src獲取popcorn.capture.js
它可以使用html5和canvas
Github 在這里
在這里看到它
更多細節 - 使用CANVAS從HTML5視頻創建SCREENGRABS
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Taking screengrabs from video in Canvas</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<style>
*{margin:0;padding:0;font-size:15px;font-family:calibri,arial,sans-serif}
footer,section,header{display:block;}
body{padding:2em;background:#666;color:#fff;}
h1{font-size:24px;margin:10px 0;}
h2{font-size:18px;margin:10px 0;color:lime;}
canvas{display:block;border:2px solid #000;}
#video,#canvas{float:left;padding-right:10px;}
#video{width:640px;}
#save li{list-style:none;margin:0;padding:0}
#save{clear:both;padding:10px 0;overflow:auto;}
#save img{float:left;padding-right:5px;padding-bottom:5px;}
footer a{color:lime;}
footer p{margin:5em 0 1em 0;padding:1em 0;border-top:1px solid #999}
</style>
</head>
<body>
<header><h1>Taking screengrabs from video in Canvas (Chrome, Mozilla, Opera, Safari - maybe IE (got no windows))</h1></header>
<section>
<p>Simply play the video. Every time you pause, you can see the screenshot on the right. Click the screenshot to store it in your collection below.</p>
<div id="video">
<h2>The Video:</h2>
<video controls>
<source src="meetthecubs.mp4" type="video/mp4"></source>
<source src="meetthecubs.webm" type="video/webm"></source>
</video>
</div>
<div id="canvas">
<h2>Preview (click to store images below):</h2>
<canvas></canvas>
</div>
<div id="save">
<h2>Your saved images:</h2>
<ul></ul>
</div>
</section>
<footer>
<p>Written by
<a href="http://wait-till-i.com/">Chris Heilmann</a> -
<a href="http://twitter.com/codepo8">@codepo8</a>
</p>
</footer>
<script>
(function(){
var v = document.querySelector('video'),
n = document.querySelector('source').src.replace(/.*\/|\..*$/g,''),
c = document.querySelector('canvas'),
save = document.querySelector('#save ul'),
ctx = c.getContext('2d');
v.addEventListener('loadedmetadata',function(ev){
var ratio = v.videoWidth/v.videoHeight,
w = 400,
h = parseInt(w / ratio, 10),
time = 0,
img = null,
li = null;
c.width = w;
c.height = h + 40;
v.addEventListener('timeupdate',function(ev){
if(v.paused){
ctx.fillStyle = 'rgb(0, 0, 0)';
ctx.fillRect(0, 0, w, h);
ctx.drawImage(v, 0, 40, w, h);
ctx.font = '20px Calibri';
ctx.fillStyle = 'lime';
ctx.fillText(n, 5, 20);
time = format(v.currentTime);
ctx.fillStyle = 'white';
ctx.fillText(time, 395 - ctx.measureText(time).width, 20);
}
},false);
c.addEventListener('click',function(ev){
li = document.createElement('li');
img = document.createElement('img');
li.appendChild(img);
save.appendChild(li);
img.src = ctx.canvas.toDataURL('image/png');
},false);
},false);
function format(time){
var hours = parseInt((time / 60 / 60) % 60, 10),
mins = parseInt((time / 60) % 60, 10),
secs = parseInt(time, 10) % 60,
hourss = (hours < 10 ? '0' : '') + parseInt(hours, 10) + ':',
minss = (mins < 10 ? '0' : '') + parseInt(mins, 10) + ':',
secss = (secs < 10 ? '0' : '') +(secs % 60),
timestring = ( hourss !== '00:' ? hourss : '' ) + minss + secss;
return timestring;
};
})();
</script>
</body>
</html>
確保視頻源正確無誤。
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