update music artists

Emby.Dlna/ContentDirectory/ControlHandler.cs

@@ -260,7 +260,7 @@ namespace Emby.Dlna.ContentDirectory
                 {
                     totalCount = 1;
 
-                    if (item.IsFolder || serverItem.StubType.HasValue)
+                    if (item.IsDisplayedAsFolder || serverItem.StubType.HasValue)
                     {
                         var childrenResult = (await GetUserItems(item, serverItem.StubType, user, sortCriteria, start, requestedCount).ConfigureAwait(false));
 
@@ -285,7 +285,7 @@ namespace Emby.Dlna.ContentDirectory
                         var childItem = i.Item;
                         var displayStubType = i.StubType;
 
-                        if (childItem.IsFolder || displayStubType.HasValue)
+                        if (childItem.IsDisplayedAsFolder || displayStubType.HasValue)
                         {
                             var childCount = (await GetUserItems(childItem, displayStubType, user, sortCriteria, null, 0).ConfigureAwait(false))
                                 .TotalRecordCount;
@@ -381,7 +381,7 @@ namespace Emby.Dlna.ContentDirectory
 
                 foreach (var i in childrenResult.Items)
                 {
-                    if (i.IsFolder)
+                    if (i.IsDisplayedAsFolder)
                     {
                         var childCount = (await GetChildrenSorted(i, user, searchCriteria, sortCriteria, null, 0).ConfigureAwait(false))
                             .TotalRecordCount;

Emby.Dlna/Didl/DidlBuilder.cs

@@ -686,7 +686,7 @@ namespace Emby.Dlna.Didl
 
             writer.WriteStartElement("upnp", "class", NS_UPNP);
 
-            if (item.IsFolder || stubType.HasValue)
+            if (item.IsDisplayedAsFolder || stubType.HasValue)
             {
                 string classType = null;
 

MediaBrowser.Api/Playback/BaseStreamingService.cs

@@ -2710,7 +2710,12 @@ namespace MediaBrowser.Api.Playback
                     {
                         if (!string.IsNullOrWhiteSpace(stream.Codec) && stream.Index != -1)
                         {
-                            inputModifier += " -codec:" + stream.Index.ToString(UsCulture) + " " + stream.Codec;
+                            var decoder = GetDecoderFromCodec(stream.Codec);
+
+                            if (!string.IsNullOrWhiteSpace(decoder))
+                            {
+                                inputModifier += " -codec:" + stream.Index.ToString(UsCulture) + " " + decoder;
+                            }
                         }
                     }
                 }
@@ -2730,6 +2735,16 @@ namespace MediaBrowser.Api.Playback
             return inputModifier;
         }
 
+        private string GetDecoderFromCodec(string codec)
+        {
+            if (string.Equals(codec, "mp2", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+
+            return codec;
+        }
+
         /// <summary>
         /// Infers the audio codec based on the url
         /// </summary>

MediaBrowser.Controller/Entities/Audio/MusicArtist.cs

@@ -44,6 +44,15 @@ namespace MediaBrowser.Controller.Entities.Audio
             }
         }
 
+        [IgnoreDataMember]
+        public override bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return true;
+            }
+        }
+
         [IgnoreDataMember]
         public override bool SupportsAddingToPlaylist
         {

MediaBrowser.Controller/Entities/Audio/MusicGenre.cs

@@ -40,6 +40,15 @@ namespace MediaBrowser.Controller.Entities.Audio
             }
         }
 
+        [IgnoreDataMember]
+        public override bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return true;
+            }
+        }
+
         /// <summary>
         /// Returns the folder containing the item.
         /// If the item is a folder, it returns the folder itself

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -1631,6 +1631,15 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        [IgnoreDataMember]
+        public virtual bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return false;
+            }
+        }
+
         public virtual string GetClientTypeName()
         {
             if (IsFolder && SourceType == SourceType.Channel && !(this is Channel))

MediaBrowser.Controller/Entities/Folder.cs

@@ -85,6 +85,15 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        [IgnoreDataMember]
+        public override bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return true;
+            }
+        }
+
         [IgnoreDataMember]
         public virtual bool SupportsCumulativeRunTimeTicks
         {

MediaBrowser.Controller/Entities/Genre.cs

@@ -40,6 +40,15 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        [IgnoreDataMember]
+        public override bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return true;
+            }
+        }
+
         [IgnoreDataMember]
         public override bool SupportsAncestors
         {

MediaBrowser.Controller/Entities/Studio.cs

@@ -39,6 +39,15 @@ namespace MediaBrowser.Controller.Entities
             }
         }
 
+        [IgnoreDataMember]
+        public override bool IsDisplayedAsFolder
+        {
+            get
+            {
+                return true;
+            }
+        }
+
         [IgnoreDataMember]
         public override bool SupportsAncestors
         {

MediaBrowser.Providers/Manager/ProviderManager.cs

@@ -921,8 +921,6 @@ namespace MediaBrowser.Providers.Manager
         {
             await item.RefreshMetadata(options, CancellationToken.None).ConfigureAwait(false);
 
-            if (item.IsFolder)
-            {
             // Collection folders don't validate their children so we'll have to simulate that here
             var collectionFolder = item as CollectionFolder;
 
@@ -932,8 +930,10 @@ namespace MediaBrowser.Providers.Manager
             }
             else
             {
-                    var folder = (Folder)item;
+                var folder = item as Folder;
 
+                if (folder != null)
+                {
                     await folder.ValidateChildren(new Progress<double>(), cancellationToken, options).ConfigureAwait(false);
                 }
             }