Jquery Media plugin autoplay false not working for mp4 files

Jquery Media plugin autoplay false not working for mp4 files

I have called the media plugin like this

$('.media').media( { width: 480, height: 420, autoplay: false } );

FLV files using mediaplayer.swf don't play automatically as expected, but mp4 files do. I haven't changed anything in jquery.media.js