Index: src/wp-includes/js/media/grid.js
===================================================================
--- src/wp-includes/js/media/grid.js	(revision 31404)
+++ src/wp-includes/js/media/grid.js	(working copy)
@@ -1993,7 +1993,9 @@
 		wp.media.mixin.removeAllPlayers();
 		this.$( 'audio, video' ).each( function (i, elem) {
 			var el = MediaDetails.prepareSrc( elem );
-			new window.MediaElementPlayer( el, wp.media.mixin.mejsSettings );
+			setTimeout( function() {
+				new window.MediaElementPlayer( el, wp.media.mixin.mejsSettings );
+			}, 1 );
 		} );
 	}
 });
Index: src/wp-includes/js/media/views/attachment/details-two-column.js
===================================================================
--- src/wp-includes/js/media/views/attachment/details-two-column.js	(revision 31404)
+++ src/wp-includes/js/media/views/attachment/details-two-column.js	(working copy)
@@ -32,7 +32,9 @@
 		wp.media.mixin.removeAllPlayers();
 		this.$( 'audio, video' ).each( function (i, elem) {
 			var el = MediaDetails.prepareSrc( elem );
-			new window.MediaElementPlayer( el, wp.media.mixin.mejsSettings );
+			setTimeout( function() {
+				new window.MediaElementPlayer( el, wp.media.mixin.mejsSettings );
+			}, 1 );
 		} );
 	}
 });