diff -up wordpress/wp-includes/js/mediaelement/mediaelement-and-player.js.old wordpress/wp-includes/js/mediaelement/mediaelement-and-player.js
--- wordpress/wp-includes/js/mediaelement/mediaelement-and-player.js.old	2017-11-16 09:22:17.148277728 +0100
+++ wordpress/wp-includes/js/mediaelement/mediaelement-and-player.js	2017-11-16 09:23:42.056696625 +0100
@@ -6121,6 +6121,7 @@ if (hasFlash) {
 		}
 	});
 
+/* swf files removed from RPM
 	var FlashMediaElementVideoRenderer = {
 		name: 'flash_video',
 		options: {
@@ -6205,6 +6206,7 @@ if (hasFlash) {
 		create: FlashMediaElementRenderer.create
 	};
 	_renderer.renderer.add(FlashMediaElementAudioOggRenderer);
+*/
 }
 
 },{"2":2,"25":25,"27":27,"28":28,"3":3,"5":5,"7":7,"8":8}],21:[function(_dereq_,module,exports){
diff -up wordpress/wp-includes/js/mediaelement/mediaelement.js.old wordpress/wp-includes/js/mediaelement/mediaelement.js
--- wordpress/wp-includes/js/mediaelement/mediaelement.js.old	2017-11-16 09:24:44.984007081 +0100
+++ wordpress/wp-includes/js/mediaelement/mediaelement.js	2017-11-16 09:24:49.655030123 +0100
@@ -1839,6 +1839,7 @@ if (hasFlash) {
 		}
 	});
 
+/* swf files removed from RPM
 	var FlashMediaElementVideoRenderer = {
 		name: 'flash_video',
 		options: {
@@ -1923,6 +1924,7 @@ if (hasFlash) {
 		create: FlashMediaElementRenderer.create
 	};
 	_renderer.renderer.add(FlashMediaElementAudioOggRenderer);
+*/
 }
 
 },{"16":16,"18":18,"19":19,"2":2,"3":3,"5":5,"7":7,"8":8}],12:[function(_dereq_,module,exports){