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從視頻中提取海報圖片

[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

這里看到它

更多細節 - 使用CANVAS從HTML5視頻創建SCREENGRABS

在此輸入圖像描述

<!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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