<html>
<body>
<button onclick="getFirstBuffRange()" type="button">Get first buffered range</button>
<br>
<video id="video1" controls="controls">
<source src="mov_bbb.mp4" type="video/mp4">
<source src="mov_bbb.ogg" type="video/ogg">
Your browser does not support HTML5 video.
</source></source></video>
<script>
myVid=document.getElementById("video1");
function getFirstBuffRange()
{
alert("Start: " + myVid.buffered.start(0) + " End: " + myVid.buffered.end(0));
}
</script>
<p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
</body>
</html>