HTML5-video - autoplay

HTML

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

CSS

.animated {
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}

@-webkit-keyframes tada {
  from {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
  10%,
  20% {
    -webkit-transform: scale3d(.9, .9, .9) rotate3d(0, 0, 1, -3deg);
    transform: scale3d(.9, .9, .9) rotate3d(0, 0, 1, -3deg);
  }
  30%,
  50%,
  70%,
  90% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, 3deg);
    transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, 3deg);
  }
  40%,
  60%,
  80% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, -3deg);
    transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, -3deg);
  }
  to {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

@keyframes tada {
  from {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
  10%,
  20% {
    -webkit-transform: scale3d(.9, .9, .9) rotate3d(0, 0, 1, -3deg);
    transform: scale3d(.9, .9, .9) rotate3d(0, 0, 1, -3deg);
  }
  30%,
  50%,
  70%,
  90% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, 3deg);
    transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, 3deg);
  }
  40%,
  60%,
  80% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, -3deg);
    transform: scale3d(1.1, 1.1, 1.1) rotate3d(0, 0, 1, -3deg);
  }
  to {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

.tada {
  -webkit-animation-name: tada;
  animation-name: tada;
}

html {
  padding: 20px 0;
  background-color: #efefef;
}

body {
  width: 400px;
  padding: 40px;
  margin: 0 auto;
  background: #fff;
  box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.5);
}

video {
  width: 400px;
  display: block;
}

#wh {
  animation-iteration-count: infinite;
  -webkit-animation-iteration-count: infinite;
  -moz-animation-iteration-count: infinite;
}