WP: shortcode video HTML5

gistfile1.phtml

function video_dp_shortcode( $atts ) {

    extract( shortcode_atts(
        array(
            'poster' => NULL,
            'mp4' => NULL,
            'ogg' => NULL,
            'webm' => NULL,
            ), $atts )
           );

    $html = '<video width="100%" autobuffer preload="auto" controls poster="'.$atts['poster'].'">';
    $html .= '<source src="'.$atts['mp4'].'" type="video/mp4; codecs="avc1.42E01E, mp4a.40.2">';
    $html .= '<source src="'.$atts['ogg'].'" type="video/ogg; codecs="theora, vorbis">';
    $html .= '<source src="'.$atts['webm'].'" type="video/webm">';
    $html .= '<object width="1080" height="720" type="application/x-shockwave-flash" data="js/flashmediaelement.swf">';
    $html .= '<param name="movie" value="js/flashmediaelement.swf" />';
    $html .= '<param name="flashvars" value="controls=true&amp;autoplay=true&amp;file='.$atts['mp4'].'" />';
    $html .= '</object>';
    $html .= '<img src="'.$atts['poster'].'" alt="video">';
    $html .= '</video>';

    return $html;
}

add_shortcode( 'video_dp', 'video_dp_shortcode' );