faster prebuffer of scrubbing

gistfile1.js

function addSourceToVideo(element, src, type) {
    var source = document.createElement('source');

    source.src = src;
    source.type = type;

    element.appendChild(source);
}

var video;
var index = 0;
$(document).ready(function(){
	video = document.getElementsByTagName('video')[0];

    addSourceToVideo( video, "http://video-js.zencoder.com/oceans-clip.ogv", "video/ogv");
    addSourceToVideo( video, "http://video-js.zencoder.com/oceans-clip.mp4", "video/mp4");

	video.addEventListener("progress", progressHandler,false);

	bindKeys();
});

progressHandler = function(e) {
	if( video.duration ) {
		var percent = video.buffered.end(0) / video.duration;
		console.log( percent );
		if( percent >= 1 ) {
			console.log("loaded!");
		}
		video.currentTime = video.duration * percent;
	}
}