It' s the same breaking crackling sound with html on the web address you supplied.
but does not happen in iron 23....as all noted earlier.
Just out of interest...iron 24 works fine on my desktop pc with HTML 5 video sound.
It's just with the laptop that problems apper.
But like i say, there were no laptops problems in iron 23 etc.........
only when trying the latest iron 24 etc did HTML 5 sound problems appear.
and as mentioned earlier i have exhaustively tested this on the laptop. It's a bug in iron