Merge remote-tracking branch 'upstream/master' into baseitemkind-fixes

17 files changed, 206 insertions, 210 deletions

diff --git a/Emby.Server.Implementations/Library/Resolvers/Audio/AudioResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Audio/AudioResolver.cs
index 90b6a8a7d..e893d6335 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Audio/AudioResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Audio/AudioResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -201,6 +203,11 @@ namespace Emby.Server.Implementations.Library.Resolvers.Audio
                     continue;
                 }
 
+                if (resolvedItem.Files.Count == 0)
+                {
+                    continue;
+                }
+
                 var firstMedia = resolvedItem.Files[0];
 
                 var libraryItem = new T
diff --git a/Emby.Server.Implementations/Library/Resolvers/Audio/MusicAlbumResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Audio/MusicAlbumResolver.cs
index bf32381eb..8e1eccb10 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Audio/MusicAlbumResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Audio/MusicAlbumResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/Emby.Server.Implementations/Library/Resolvers/Audio/MusicArtistResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Audio/MusicArtistResolver.cs
index 60f82806f..3d2ae95d2 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Audio/MusicArtistResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Audio/MusicArtistResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Linq;
 using System.Threading.Tasks;
diff --git a/Emby.Server.Implementations/Library/Resolvers/BaseVideoResolver.cs b/Emby.Server.Implementations/Library/Resolvers/BaseVideoResolver.cs
index 2f5e46038..cdb492022 100644
--- a/Emby.Server.Implementations/Library/Resolvers/BaseVideoResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/BaseVideoResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -30,7 +32,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
         /// </summary>
         /// <param name="args">The args.</param>
         /// <returns>`0.</returns>
-        protected override T Resolve(ItemResolveArgs args)
+        public override T Resolve(ItemResolveArgs args)
         {
             return ResolveVideo<T>(args, false);
         }
@@ -42,14 +44,12 @@ namespace Emby.Server.Implementations.Library.Resolvers
         /// <param name="args">The args.</param>
         /// <param name="parseName">if set to <c>true</c> [parse name].</param>
         /// <returns>``0.</returns>
-        protected TVideoType ResolveVideo<TVideoType>(ItemResolveArgs args, bool parseName)
+        protected virtual TVideoType ResolveVideo<TVideoType>(ItemResolveArgs args, bool parseName)
               where TVideoType : Video, new()
         {
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
+            var namingOptions = LibraryManager.GetNamingOptions();
 
             // If the path is a file check for a matching extensions
-            var parser = new VideoResolver(namingOptions);
-
             if (args.IsDirectory)
             {
                 TVideoType video = null;
@@ -64,7 +64,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
                     {
                         if (IsDvdDirectory(child.FullName, filename, args.DirectoryService))
                         {
-                            videoInfo = parser.ResolveDirectory(args.Path);
+                            videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                             if (videoInfo == null)
                             {
@@ -82,7 +82,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
                         if (IsBluRayDirectory(child.FullName, filename, args.DirectoryService))
                         {
-                            videoInfo = parser.ResolveDirectory(args.Path);
+                            videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                             if (videoInfo == null)
                             {
@@ -100,7 +100,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
                     }
                     else if (IsDvdFile(filename))
                     {
-                        videoInfo = parser.ResolveDirectory(args.Path);
+                        videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                         if (videoInfo == null)
                         {
@@ -130,7 +130,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
             }
             else
             {
-                var videoInfo = parser.Resolve(args.Path, false, false);
+                var videoInfo = VideoResolver.Resolve(args.Path, false, namingOptions, false);
 
                 if (videoInfo == null)
                 {
@@ -165,13 +165,13 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
         protected void SetVideoType(Video video, VideoFileInfo videoInfo)
         {
-            var extension = Path.GetExtension(video.Path);
-            video.VideoType = string.Equals(extension, ".iso", StringComparison.OrdinalIgnoreCase) ||
-                string.Equals(extension, ".img", StringComparison.OrdinalIgnoreCase) ?
-              VideoType.Iso :
-              VideoType.VideoFile;
+            var extension = Path.GetExtension(video.Path.AsSpan());
+            video.VideoType = extension.Equals(".iso", StringComparison.OrdinalIgnoreCase)
+                              || extension.Equals(".img", StringComparison.OrdinalIgnoreCase)
+                ? VideoType.Iso
+                : VideoType.VideoFile;
 
-            video.IsShortcut = string.Equals(extension, ".strm", StringComparison.OrdinalIgnoreCase);
+            video.IsShortcut = extension.Equals(".strm", StringComparison.OrdinalIgnoreCase);
             video.IsPlaceHolder = videoInfo.IsStub;
 
             if (videoInfo.IsStub)
@@ -193,11 +193,11 @@ namespace Emby.Server.Implementations.Library.Resolvers
         {
             if (video.VideoType == VideoType.Iso)
             {
-                if (video.Path.IndexOf("dvd", StringComparison.OrdinalIgnoreCase) != -1)
+                if (video.Path.Contains("dvd", StringComparison.OrdinalIgnoreCase))
                 {
                     video.IsoType = IsoType.Dvd;
                 }
-                else if (video.Path.IndexOf("bluray", StringComparison.OrdinalIgnoreCase) != -1)
+                else if (video.Path.Contains("bluray", StringComparison.OrdinalIgnoreCase))
                 {
                     video.IsoType = IsoType.BluRay;
                 }
@@ -250,10 +250,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
         protected void Set3DFormat(Video video)
         {
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
-
-            var resolver = new Format3DParser(namingOptions);
-            var result = resolver.Parse(video.Path);
+            var result = Format3DParser.Parse(video.Path, LibraryManager.GetNamingOptions());
 
             Set3DFormat(video, result.Is3D, result.Format3D);
         }
diff --git a/Emby.Server.Implementations/Library/Resolvers/Books/BookResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Books/BookResolver.cs
index 86242d137..68076730b 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Books/BookResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Books/BookResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -13,7 +15,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.Books
     {
         private readonly string[] _validExtensions = { ".azw", ".azw3", ".cb7", ".cbr", ".cbt", ".cbz", ".epub", ".mobi", ".pdf" };
 
-        protected override Book Resolve(ItemResolveArgs args)
+        public override Book Resolve(ItemResolveArgs args)
         {
             var collectionType = args.GetCollectionType();
 
diff --git a/Emby.Server.Implementations/Library/Resolvers/FolderResolver.cs b/Emby.Server.Implementations/Library/Resolvers/FolderResolver.cs
index 7dbce7a6e..7aaee017d 100644
--- a/Emby.Server.Implementations/Library/Resolvers/FolderResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/FolderResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Resolvers;
diff --git a/Emby.Server.Implementations/Library/Resolvers/ItemResolver.cs b/Emby.Server.Implementations/Library/Resolvers/ItemResolver.cs
index 9ca76095b..fa45ccf84 100644
--- a/Emby.Server.Implementations/Library/Resolvers/ItemResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/ItemResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Resolvers;
@@ -12,6 +14,12 @@ namespace Emby.Server.Implementations.Library.Resolvers
         where T : BaseItem, new()
     {
         /// <summary>
+        /// Gets the priority.
+        /// </summary>
+        /// <value>The priority.</value>
+        public virtual ResolverPriority Priority => ResolverPriority.First;
+
+        /// <summary>
         /// Resolves the specified args.
         /// </summary>
         /// <param name="args">The args.</param>
@@ -22,12 +30,6 @@ namespace Emby.Server.Implementations.Library.Resolvers
         }
 
         /// <summary>
-        /// Gets the priority.
-        /// </summary>
-        /// <value>The priority.</value>
-        public virtual ResolverPriority Priority => ResolverPriority.First;
-
-        /// <summary>
         /// Sets initial values on the newly resolved item.
         /// </summary>
         /// <param name="item">The item.</param>
diff --git a/Emby.Server.Implementations/Library/Resolvers/Movies/BoxSetResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Movies/BoxSetResolver.cs
index 295e9e120..69d71d0d9 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Movies/BoxSetResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Movies/BoxSetResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.IO;
 using MediaBrowser.Controller.Entities;
diff --git a/Emby.Server.Implementations/Library/Resolvers/Movies/MovieResolver.cs b/Emby.Server.Implementations/Library/Resolvers/Movies/MovieResolver.cs
index 8ef7172de..97f96f746 100644
--- a/Emby.Server.Implementations/Library/Resolvers/Movies/MovieResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/Movies/MovieResolver.cs
@@ -1,9 +1,12 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
 using Emby.Naming.Video;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Drawing;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Movies;
@@ -69,6 +72,110 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
             return result;
         }
 
+        /// <summary>
+        /// Resolves the specified args.
+        /// </summary>
+        /// <param name="args">The args.</param>
+        /// <returns>Video.</returns>
+        public override Video Resolve(ItemResolveArgs args)
+        {
+            var collectionType = args.GetCollectionType();
+
+            // Find movies with their own folders
+            if (args.IsDirectory)
+            {
+                if (IsInvalid(args.Parent, collectionType))
+                {
+                    return null;
+                }
+
+                var files = args.FileSystemChildren
+                    .Where(i => !LibraryManager.IgnoreFile(i, args.Parent))
+                    .ToList();
+
+                if (string.Equals(collectionType, CollectionType.MusicVideos, StringComparison.OrdinalIgnoreCase))
+                {
+                    return FindMovie<MusicVideo>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, false);
+                }
+
+                if (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase))
+                {
+                    return FindMovie<Video>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, false);
+                }
+
+                if (string.IsNullOrEmpty(collectionType))
+                {
+                    // Owned items will be caught by the plain video resolver
+                    if (args.Parent == null)
+                    {
+                        // return FindMovie<Video>(args.Path, args.Parent, files, args.DirectoryService, collectionType);
+                        return null;
+                    }
+
+                    if (args.HasParent<Series>())
+                    {
+                        return null;
+                    }
+
+                    {
+                        return FindMovie<Movie>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, true);
+                    }
+                }
+
+                if (string.Equals(collectionType, CollectionType.Movies, StringComparison.OrdinalIgnoreCase))
+                {
+                    return FindMovie<Movie>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, true);
+                }
+
+                return null;
+            }
+
+            // Handle owned items
+            if (args.Parent == null)
+            {
+                return base.Resolve(args);
+            }
+
+            if (IsInvalid(args.Parent, collectionType))
+            {
+                return null;
+            }
+
+            Video item = null;
+
+            if (string.Equals(collectionType, CollectionType.MusicVideos, StringComparison.OrdinalIgnoreCase))
+            {
+                item = ResolveVideo<MusicVideo>(args, false);
+            }
+
+            // To find a movie file, the collection type must be movies or boxsets
+            else if (string.Equals(collectionType, CollectionType.Movies, StringComparison.OrdinalIgnoreCase))
+            {
+                item = ResolveVideo<Movie>(args, true);
+            }
+            else if (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) ||
+                string.Equals(collectionType, CollectionType.Photos, StringComparison.OrdinalIgnoreCase))
+            {
+                item = ResolveVideo<Video>(args, false);
+            }
+            else if (string.IsNullOrEmpty(collectionType))
+            {
+                if (args.HasParent<Series>())
+                {
+                    return null;
+                }
+
+                item = ResolveVideo<Video>(args, false);
+            }
+
+            if (item != null)
+            {
+                item.IsInMixedFolder = true;
+            }
+
+            return item;
+        }
+
         private MultiItemResolverResult ResolveMultipleInternal(
             Folder parent,
             List<FileSystemMetadata> files,
@@ -151,10 +258,9 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
                 }
             }
 
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
+            var namingOptions = LibraryManager.GetNamingOptions();
 
-            var resolver = new VideoListResolver(namingOptions);
-            var resolverResult = resolver.Resolve(files, suppportMultiEditions).ToList();
+            var resolverResult = VideoListResolver.Resolve(files, namingOptions, suppportMultiEditions).ToList();
 
             var result = new MultiItemResolverResult
             {
@@ -217,110 +323,6 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
         }
 
         /// <summary>
-        /// Resolves the specified args.
-        /// </summary>
-        /// <param name="args">The args.</param>
-        /// <returns>Video.</returns>
-        protected override Video Resolve(ItemResolveArgs args)
-        {
-            var collectionType = args.GetCollectionType();
-
-            // Find movies with their own folders
-            if (args.IsDirectory)
-            {
-                if (IsInvalid(args.Parent, collectionType))
-                {
-                    return null;
-                }
-
-                var files = args.FileSystemChildren
-                    .Where(i => !LibraryManager.IgnoreFile(i, args.Parent))
-                    .ToList();
-
-                if (string.Equals(collectionType, CollectionType.MusicVideos, StringComparison.OrdinalIgnoreCase))
-                {
-                    return FindMovie<MusicVideo>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, false);
-                }
-
-                if (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase))
-                {
-                    return FindMovie<Video>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, false);
-                }
-
-                if (string.IsNullOrEmpty(collectionType))
-                {
-                    // Owned items will be caught by the plain video resolver
-                    if (args.Parent == null)
-                    {
-                        // return FindMovie<Video>(args.Path, args.Parent, files, args.DirectoryService, collectionType);
-                        return null;
-                    }
-
-                    if (args.HasParent<Series>())
-                    {
-                        return null;
-                    }
-
-                    {
-                        return FindMovie<Movie>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, true);
-                    }
-                }
-
-                if (string.Equals(collectionType, CollectionType.Movies, StringComparison.OrdinalIgnoreCase))
-                {
-                    return FindMovie<Movie>(args, args.Path, args.Parent, files, args.DirectoryService, collectionType, true);
-                }
-
-                return null;
-            }
-
-            // Handle owned items
-            if (args.Parent == null)
-            {
-                return base.Resolve(args);
-            }
-
-            if (IsInvalid(args.Parent, collectionType))
-            {
-                return null;
-            }
-
-            Video item = null;
-
-            if (string.Equals(collectionType, CollectionType.MusicVideos, StringComparison.OrdinalIgnoreCase))
-            {
-                item = ResolveVideo<MusicVideo>(args, false);
-            }
-
-            // To find a movie file, the collection type must be movies or boxsets
-            else if (string.Equals(collectionType, CollectionType.Movies, StringComparison.OrdinalIgnoreCase))
-            {
-                item = ResolveVideo<Movie>(args, true);
-            }
-            else if (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) ||
-                string.Equals(collectionType, CollectionType.Photos, StringComparison.OrdinalIgnoreCase))
-            {
-                item = ResolveVideo<Video>(args, false);
-            }
-            else if (string.IsNullOrEmpty(collectionType))
-            {
-                if (args.HasParent<Series>())
-                {
-                    return null;
-                }
-
-                item = ResolveVideo<Video>(args, false);
-            }
-
-            if (item != null)
-            {
-                item.IsInMixedFolder = true;
-            }
-
-            return item;
-        }
-
-        /// <summary>
         /// Sets the initial item values.
         /// </summary>
         /// <param name="item">The item.</param>
@@ -376,7 +378,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
         {
             var multiDiscFolders = new List<FileSystemMetadata>();
 
-            var libraryOptions = args.GetLibraryOptions();
+            var libraryOptions = args.LibraryOptions;
             var supportPhotos = string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) && libraryOptions.EnablePhotos;
             var photos = new List<FileSystemMetadata>();
 
@@ -535,7 +537,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
             return returnVideo;
         }
 
-        private bool IsInvalid(Folder parent, string collectionType)
+        private bool IsInvalid(Folder parent, ReadOnlySpan<char> collectionType)
         {
             if (parent != null)
             {
@@ -545,12 +547,12 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
                 }
             }
 
-            if (string.IsNullOrEmpty(collectionType))
+            if (collectionType.IsEmpty)
             {
                 return false;
             }
 
-            return !_validCollectionTypes.Contains(collectionType, StringComparer.OrdinalIgnoreCase);
+            return !_validCollectionTypes.Contains(collectionType, StringComparison.OrdinalIgnoreCase);
         }
     }
 }
diff --git a/Emby.Server.Implementations/Library/Resolvers/PhotoAlbumResolver.cs b/Emby.Server.Implementations/Library/Resolvers/PhotoAlbumResolver.cs
index 3ac837057..534bc80dd 100644
--- a/Emby.Server.Implementations/Library/Resolvers/PhotoAlbumResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/PhotoAlbumResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using MediaBrowser.Controller.Drawing;
 using MediaBrowser.Controller.Entities;
@@ -13,7 +15,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
     public class PhotoAlbumResolver : FolderResolver<PhotoAlbum>
     {
         private readonly IImageProcessor _imageProcessor;
-        private ILibraryManager _libraryManager;
+        private readonly ILibraryManager _libraryManager;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PhotoAlbumResolver"/> class.
@@ -26,6 +28,9 @@ namespace Emby.Server.Implementations.Library.Resolvers
             _libraryManager = libraryManager;
         }
 
+        /// <inheritdoc />
+        public override ResolverPriority Priority => ResolverPriority.Second;
+
         /// <summary>
         /// Resolves the specified args.
         /// </summary>
@@ -39,8 +44,8 @@ namespace Emby.Server.Implementations.Library.Resolvers
                 // Must be an image file within a photo collection
                 var collectionType = args.GetCollectionType();
 
-                if (string.Equals(collectionType, CollectionType.Photos, StringComparison.OrdinalIgnoreCase) ||
-                    (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) && args.GetLibraryOptions().EnablePhotos))
+                if (string.Equals(collectionType, CollectionType.Photos, StringComparison.OrdinalIgnoreCase)
+                    || (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) && args.LibraryOptions.EnablePhotos))
                 {
                     if (HasPhotos(args))
                     {
@@ -84,8 +89,5 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
             return false;
         }
-
-        /// <inheritdoc />
-        public override ResolverPriority Priority => ResolverPriority.Second;
     }
 }
diff --git a/Emby.Server.Implementations/Library/Resolvers/PhotoResolver.cs b/Emby.Server.Implementations/Library/Resolvers/PhotoResolver.cs
index bcfcee9c6..57bf40e9e 100644
--- a/Emby.Server.Implementations/Library/Resolvers/PhotoResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/PhotoResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -47,7 +49,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
                 var collectionType = args.CollectionType;
 
                 if (string.Equals(collectionType, CollectionType.Photos, StringComparison.OrdinalIgnoreCase)
-                    || (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) && args.GetLibraryOptions().EnablePhotos))
+                    || (string.Equals(collectionType, CollectionType.HomeVideos, StringComparison.OrdinalIgnoreCase) && args.LibraryOptions.EnablePhotos))
                 {
                     if (IsImageFile(args.Path, _imageProcessor))
                     {
diff --git a/Emby.Server.Implementations/Library/Resolvers/PlaylistResolver.cs b/Emby.Server.Implementations/Library/Resolvers/PlaylistResolver.cs
index c76d41e5c..ecd44be47 100644
--- a/Emby.Server.Implementations/Library/Resolvers/PlaylistResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/PlaylistResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -63,7 +65,8 @@ namespace Emby.Server.Implementations.Library.Resolvers
                     {
                         Path = args.Path,
                         Name = Path.GetFileNameWithoutExtension(args.Path),
-                        IsInMixedFolder = true
+                        IsInMixedFolder = true,
+                        PlaylistMediaType = MediaType.Audio
                     };
                 }
             }
diff --git a/Emby.Server.Implementations/Library/Resolvers/SpecialFolderResolver.cs b/Emby.Server.Implementations/Library/Resolvers/SpecialFolderResolver.cs
index 99f304190..7b4e14334 100644
--- a/Emby.Server.Implementations/Library/Resolvers/SpecialFolderResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/SpecialFolderResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
diff --git a/Emby.Server.Implementations/Library/Resolvers/TV/EpisodeResolver.cs b/Emby.Server.Implementations/Library/Resolvers/TV/EpisodeResolver.cs
index 2f7af60c0..d6ae91056 100644
--- a/Emby.Server.Implementations/Library/Resolvers/TV/EpisodeResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/TV/EpisodeResolver.cs
@@ -1,5 +1,8 @@
+#nullable disable
+
 using System;
 using System.Linq;
+using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.TV;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Model.Entities;
@@ -12,11 +15,20 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
     public class EpisodeResolver : BaseVideoResolver<Episode>
     {
         /// <summary>
+        /// Initializes a new instance of the <see cref="EpisodeResolver"/> class.
+        /// </summary>
+        /// <param name="libraryManager">The library manager.</param>
+        public EpisodeResolver(ILibraryManager libraryManager)
+            : base(libraryManager)
+        {
+        }
+
+        /// <summary>
         /// Resolves the specified args.
         /// </summary>
         /// <param name="args">The args.</param>
         /// <returns>Episode.</returns>
-        protected override Episode Resolve(ItemResolveArgs args)
+        public override Episode Resolve(ItemResolveArgs args)
         {
             var parent = args.Parent;
 
@@ -25,30 +37,23 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
                 return null;
             }
 
-            var season = parent as Season;
-
             // Just in case the user decided to nest episodes.
             // Not officially supported but in some cases we can handle it.
-            if (season == null)
-            {
-                season = parent.GetParents().OfType<Season>().FirstOrDefault();
-            }
 
-            // If the parent is a Season or Series, then this is an Episode if the VideoResolver returns something
+            var season = parent as Season ?? parent.GetParents().OfType<Season>().FirstOrDefault();
+
+            // If the parent is a Season or Series and the parent is not an extras folder, then this is an Episode if the VideoResolver returns something
             // Also handle flat tv folders
-            if (season != null ||
-                string.Equals(args.GetCollectionType(), CollectionType.TvShows, StringComparison.OrdinalIgnoreCase) ||
-                args.HasParent<Series>())
+            if ((season != null ||
+                 string.Equals(args.GetCollectionType(), CollectionType.TvShows, StringComparison.OrdinalIgnoreCase) ||
+                 args.HasParent<Series>())
+                && (parent is Series || !BaseItem.AllExtrasTypesFolderNames.Contains(parent.Name, StringComparer.OrdinalIgnoreCase)))
             {
                 var episode = ResolveVideo<Episode>(args, false);
 
                 if (episode != null)
                 {
-                    var series = parent as Series;
-                    if (series == null)
-                    {
-                        series = parent.GetParents().OfType<Series>().FirstOrDefault();
-                    }
+                    var series = parent as Series ?? parent.GetParents().OfType<Series>().FirstOrDefault();
 
                     if (series != null)
                     {
@@ -74,14 +79,5 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
 
             return null;
         }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="EpisodeResolver"/> class.
-        /// </summary>
-        /// <param name="libraryManager">The library manager.</param>
-        public EpisodeResolver(ILibraryManager libraryManager)
-            : base(libraryManager)
-        {
-        }
     }
 }
diff --git a/Emby.Server.Implementations/Library/Resolvers/TV/SeasonResolver.cs b/Emby.Server.Implementations/Library/Resolvers/TV/SeasonResolver.cs
index 3332e1806..7d707df18 100644
--- a/Emby.Server.Implementations/Library/Resolvers/TV/SeasonResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/TV/SeasonResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Globalization;
 using Emby.Naming.TV;
 using MediaBrowser.Controller.Entities.TV;
@@ -88,7 +90,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
                             CultureInfo.InvariantCulture,
                             _localization.GetLocalizedString("NameSeasonNumber"),
                             seasonNumber,
-                            args.GetLibraryOptions().PreferredMetadataLanguage);
+                            args.LibraryOptions.PreferredMetadataLanguage);
                 }
 
                 return season;
diff --git a/Emby.Server.Implementations/Library/Resolvers/TV/SeriesResolver.cs b/Emby.Server.Implementations/Library/Resolvers/TV/SeriesResolver.cs
index 732bfd94d..a1562abd3 100644
--- a/Emby.Server.Implementations/Library/Resolvers/TV/SeriesResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/TV/SeriesResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -19,19 +21,16 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
     /// </summary>
     public class SeriesResolver : FolderResolver<Series>
     {
-        private readonly IFileSystem _fileSystem;
         private readonly ILogger<SeriesResolver> _logger;
         private readonly ILibraryManager _libraryManager;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="SeriesResolver"/> class.
         /// </summary>
-        /// <param name="fileSystem">The file system.</param>
         /// <param name="logger">The logger.</param>
         /// <param name="libraryManager">The library manager.</param>
-        public SeriesResolver(IFileSystem fileSystem, ILogger<SeriesResolver> logger, ILibraryManager libraryManager)
+        public SeriesResolver(ILogger<SeriesResolver> logger, ILibraryManager libraryManager)
         {
-            _fileSystem = fileSystem;
             _logger = logger;
             _libraryManager = libraryManager;
         }
@@ -59,15 +58,6 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
                 var collectionType = args.GetCollectionType();
                 if (string.Equals(collectionType, CollectionType.TvShows, StringComparison.OrdinalIgnoreCase))
                 {
-                    // if (args.ContainsFileSystemEntryByName("tvshow.nfo"))
-                    //{
-                    //    return new Series
-                    //    {
-                    //        Path = args.Path,
-                    //        Name = Path.GetFileName(args.Path)
-                    //    };
-                    //}
-
                     var configuredContentType = _libraryManager.GetConfiguredContentType(args.Path);
                     if (!string.Equals(configuredContentType, CollectionType.TvShows, StringComparison.OrdinalIgnoreCase))
                     {
@@ -100,7 +90,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
                         return null;
                     }
 
-                    if (IsSeriesFolder(args.Path, args.FileSystemChildren, args.DirectoryService, _fileSystem, _logger, _libraryManager, false))
+                    if (IsSeriesFolder(args.Path, args.FileSystemChildren, _logger, _libraryManager, false))
                     {
                         return new Series
                         {
@@ -117,8 +107,6 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
         public static bool IsSeriesFolder(
             string path,
             IEnumerable<FileSystemMetadata> fileSystemChildren,
-            IDirectoryService directoryService,
-            IFileSystem fileSystem,
             ILogger<SeriesResolver> logger,
             ILibraryManager libraryManager,
             bool isTvContentType)
@@ -127,7 +115,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
             {
                 if (child.IsDirectory)
                 {
-                    if (IsSeasonFolder(child.FullName, isTvContentType, libraryManager))
+                    if (IsSeasonFolder(child.FullName, isTvContentType))
                     {
                         logger.LogDebug("{Path} is a series because of season folder {Dir}.", path, child.FullName);
                         return true;
@@ -161,31 +149,12 @@ namespace Emby.Server.Implementations.Library.Resolvers.TV
         }
 
         /// <summary>
-        /// Determines whether [is place holder] [the specified path].
-        /// </summary>
-        /// <param name="path">The path.</param>
-        /// <returns><c>true</c> if [is place holder] [the specified path]; otherwise, <c>false</c>.</returns>
-        /// <exception cref="ArgumentNullException">path</exception>
-        private static bool IsVideoPlaceHolder(string path)
-        {
-            if (string.IsNullOrEmpty(path))
-            {
-                throw new ArgumentNullException(nameof(path));
-            }
-
-            var extension = Path.GetExtension(path);
-
-            return string.Equals(extension, ".disc", StringComparison.OrdinalIgnoreCase);
-        }
-
-        /// <summary>
         /// Determines whether [is season folder] [the specified path].
         /// </summary>
         /// <param name="path">The path.</param>
         /// <param name="isTvContentType">if set to <c>true</c> [is tv content type].</param>
-        /// <param name="libraryManager">The library manager.</param>
         /// <returns><c>true</c> if [is season folder] [the specified path]; otherwise, <c>false</c>.</returns>
-        private static bool IsSeasonFolder(string path, bool isTvContentType, ILibraryManager libraryManager)
+        private static bool IsSeasonFolder(string path, bool isTvContentType)
         {
             var seasonNumber = SeasonPathParser.Parse(path, isTvContentType, isTvContentType).SeasonNumber;
 
diff --git a/Emby.Server.Implementations/Library/Resolvers/VideoResolver.cs b/Emby.Server.Implementations/Library/Resolvers/VideoResolver.cs
index 62268fce9..9599faea4 100644
--- a/Emby.Server.Implementations/Library/Resolvers/VideoResolver.cs
+++ b/Emby.Server.Implementations/Library/Resolvers/VideoResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using MediaBrowser.Controller.Entities;