Index: wp-admin/js/widgets/media-widgets.js
===================================================================
--- wp-admin/js/widgets/media-widgets.js	(revision 40833)
+++ wp-admin/js/widgets/media-widgets.js	(working copy)
@@ -249,13 +249,15 @@
 		 */
 		createStates: function createStates() {
 			var mime = this.options.mimeType, specificMimes = [];
+
 			_.each( wp.media.view.settings.embedMimes, function( embedMime ) {
 				if ( 0 === embedMime.indexOf( mime ) ) {
 					specificMimes.push( embedMime );
 				}
 			});
-			if ( specificMimes.length > 0 ) {
-				mime = specificMimes.join( ',' );
+
+			if ( specificMimes.length ) {
+				mime = specificMimes;
 			}
 
 			this.states.add([