兼容IE8的video写法

<video width="100%" height="515px" controls preload>
      <source src="1.mp4" type="video/mp4" codecs="avc1.42E01E,mp4a.40.2">
         <!–[if lt IE 8]>
              <embed src="1.mp4" width="100%" height="515px" autostart=false/>
          <![endif]–>
</video>