update playback settings

MediaBrowser.Controller/Entities/Video.cs

@@ -78,6 +78,14 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        public override double? GetDefaultPrimaryImageAspectRatio()
+        {
+            double value = 16;
+            value /= 9;
+
+            return value;
+        }
+
         public override string CreatePresentationUniqueKey()
         {
             if (!string.IsNullOrWhiteSpace(PrimaryVersionId))