У вашего броузера проблема в совместимости с HTML5
Recently had a staintune exhaust put on my KLR - see if you can hear a difference.
I find it subtle to listen to on the video but massively noticeable in 'real life'. The first time I fired her up with the mechanic beside me I couldn't believe it - he said, "I warned you it would wake the neighbours if they're on nightshift!"