function addSourceToVideo(element, src, type) { var source = document.createElement('source'); source.src = src; source.type = type; element.appendChild(source); }var video; $(document).ready(function(){ video = document.getElementsByTagName('video')[0]; addSourceToVideo( video, "http://your-server.com/clip.ogv", "video/ogv"); addSourceToVideo( video, "http://your-server.com/clip.mp4", "video/mp4"); video.addEventListener("progress", progressHandler,false); });progressHandler = function(e) { if( video.duration ) { var percent = (video.buffered.end(0)/video.duration) * 100; console.log( percent ); if( percent >= 100 ) { console.log("loaded!"); } video.currentTime++; } }