Viewing HTML5 video with attached audio bars - when I change videos or skip media the audio stops processing. Audio metering is based on examples here: // http://www.smartjava.org/content/exploring-html5-web-audio-visualizing-sound I've also found online an audio only repeatable demonstration of the fault: http://html5-demos.appspot.com/static/webaudio/createMediaSourceElement.html On this page if you tick "show <audio> element" and then drag the timeline the audio will stop playing.