HTML5-video - autoplay

HTML

<div class="container">
  <video autobuffer controls autoplay>
  <source id="mp4" src="http://grochtdreis.de/fuer-jsfiddle/video/sintel_trailer-480.mp4"                   type="video/mp4">
</video>

</div>

CSS

html {padding: 5px 0; background-color: #efefef;}
body {width: 410px; padding: 2px; margin: 0 auto; background: #fff; box-shadow: 10px 5px 15px rgba(0,0,0,0.9);
background: black;
}

video {
  border: 5px solid rgba(255, 255, 255, 0.8);
    width: 400px; 
    display: block;
}