--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/mediaelement/mediaelement-migrate.js	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,84 @@
+/* global console, MediaElementPlayer, mejs */
+(function ( window, $ ) {
+	// Reintegrate `plugins` since they don't exist in MEJS anymore; it won't affect anything in the player
+	if (mejs.plugins === undefined) {
+		mejs.plugins = {};
+		mejs.plugins.silverlight = [];
+		mejs.plugins.silverlight.push({
+			types: []
+		});
+	}
+
+	// Inclusion of old `HtmlMediaElementShim` if it doesn't exist
+	mejs.HtmlMediaElementShim = mejs.HtmlMediaElementShim || {
+		getTypeFromFile: mejs.Utils.getTypeFromFile
+	};
+
+	// Add missing global variables for backward compatibility
+	if (mejs.MediaFeatures === undefined) {
+		mejs.MediaFeatures = mejs.Features;
+	}
+	if (mejs.Utility === undefined) {
+		mejs.Utility = mejs.Utils;
+	}
+
+	/**
+	 * Create missing variables and have default `classPrefix` overridden to avoid issues.
+	 *
+	 * `media` is now a fake wrapper needed to simplify manipulation of various media types,
+	 * so in order to access the `video` or `audio` tag, use `media.originalNode` or `player.node`;
+	 * `player.container` used to be jQuery but now is a HTML element, and many elements inside
+	 * the player rely on it being a HTML now, so its conversion is difficult; however, a
+	 * `player.$container` new variable has been added to be used as jQuery object
+	 */
+	var init = MediaElementPlayer.prototype.init;
+	MediaElementPlayer.prototype.init = function () {
+		this.options.classPrefix = 'mejs-';
+		this.$media = this.$node = $( this.node );
+		init.call( this );
+	};
+
+	var ready = MediaElementPlayer.prototype._meReady;
+	MediaElementPlayer.prototype._meReady = function () {
+		this.container = $( this.container) ;
+		this.controls = $( this.controls );
+		this.layers = $( this.layers );
+		ready.apply( this, arguments );
+	};
+
+	// Override method so certain elements can be called with jQuery
+	MediaElementPlayer.prototype.getElement = function ( el ) {
+		return $ !== undefined && el instanceof $ ? el[0] : el;
+	};
+
+	// Add jQuery ONLY to most of custom features' arguments for backward compatibility; default features rely 100%
+	// on the arguments being HTML elements to work properly
+	MediaElementPlayer.prototype.buildfeatures = function ( player, controls, layers, media ) {
+		var defaultFeatures = [
+			'playpause',
+			'current',
+			'progress',
+			'duration',
+			'tracks',
+			'volume',
+			'fullscreen'
+		];
+		for (var i = 0, total = this.options.features.length; i < total; i++) {
+			var feature = this.options.features[i];
+			if (this['build' + feature]) {
+				try {
+					// Use jQuery for non-default features
+					if (defaultFeatures.indexOf(feature) === -1) {
+						this['build' + feature]( player, $(controls), $(layers), media );
+					} else {
+						this['build' + feature]( player, controls, layers, media );
+					}
+
+				} catch (e) {
+					console.error( 'error building ' + feature, e );
+				}
+			}
+		}
+	};
+
+})( window, jQuery );