responsible-video.js

$(function() {
    var $allVideos = $("iframe[src^='http://player.vimeo.com'], iframe[src^='http://www.youtube.com'], object, embed"),
        $fluidEl = $("figure");

    $allVideos.each(function() {
        $(this)
            // jQuery .data does not work on object/embed elements
            .attr('data-aspectRatio', this.height / this.width)
            .removeAttr('height')
            .removeAttr('width');
    });
    $(window).resize(function() {
        var newWidth = $fluidEl.width();
        $allVideos.each(function() {
            var $el = $(this);
            $el
                .width(newWidth)
                .height(newWidth * $el.attr('data-aspectRatio'));
        });
    }).resize();
});