7 files changed, 55 insertions, 4 deletions
diff --git a/MediaBrowser.Controller/Entities/BaseItem.cs b/MediaBrowser.Controller/Entities/BaseItem.cs
index 4cdcaabbb1..e24b60f69f 100644
--- a/MediaBrowser.Controller/Entities/BaseItem.cs
+++ b/MediaBrowser.Controller/Entities/BaseItem.cs
@@ -94,6 +94,8 @@ namespace MediaBrowser.Controller.Entities
 
         private string _name;
 
+        private string _originalLanguage;
+
         public const char SlugChar = '-';
 
         protected BaseItem()
@@ -217,7 +219,11 @@ namespace MediaBrowser.Controller.Entities
         public string OriginalTitle { get; set; }
 
         [JsonIgnore]
-        public string OriginalLanguage { get; set; }
+        public string OriginalLanguage
+        {
+            get => _originalLanguage;
+            set => _originalLanguage = LocalizationManager?.FindLanguageInfo(value)?.TwoLetterISOLanguageName ?? value;
+        }
 
         /// <summary>
         /// Gets or sets the id.
@@ -1564,7 +1570,7 @@ namespace MediaBrowser.Controller.Entities
         }
 
         /// <summary>
-        /// Gets the preferred metadata language.
+        /// Gets the preferred metadata country code.
         /// </summary>
         /// <returns>System.String.</returns>
         public string GetPreferredMetadataCountryCode()
@@ -1598,6 +1604,15 @@ namespace MediaBrowser.Controller.Entities
             return lang;
         }
 
+        /// <summary>
+        /// Gets the original language of the item, inheriting from parent items if necessary.
+        /// </summary>
+        /// <returns>System.String.</returns>
+        public virtual string GetInheritedOriginalLanguage()
+        {
+            return OriginalLanguage;
+        }
+
         public virtual bool IsSaveLocalMetadataEnabled()
         {
             if (SourceType == SourceType.Channel)
diff --git a/MediaBrowser.Controller/Entities/Extensions.cs b/MediaBrowser.Controller/Entities/Extensions.cs
index c56603a3eb..380041af84 100644
--- a/MediaBrowser.Controller/Entities/Extensions.cs
+++ b/MediaBrowser.Controller/Entities/Extensions.cs
@@ -34,7 +34,7 @@ namespace MediaBrowser.Controller.Entities
                 }
                 else
                 {
-                    item.RemoteTrailers = [..item.RemoteTrailers, mediaUrl];
+                    item.RemoteTrailers = [.. item.RemoteTrailers, mediaUrl];
                 }
             }
         }
diff --git a/MediaBrowser.Controller/Entities/InternalItemsQuery.cs b/MediaBrowser.Controller/Entities/InternalItemsQuery.cs
index 8ae578b228..422c40ce5d 100644
--- a/MediaBrowser.Controller/Entities/InternalItemsQuery.cs
+++ b/MediaBrowser.Controller/Entities/InternalItemsQuery.cs
@@ -21,6 +21,7 @@ namespace MediaBrowser.Controller.Entities
             AlbumArtistIds = [];
             AlbumIds = [];
             AncestorIds = [];
+            LinkedChildAncestorIds = [];
             ArtistIds = [];
             BlockUnratedItems = [];
             BoxSetLibraryFolders = [];
@@ -58,6 +59,8 @@ namespace MediaBrowser.Controller.Entities
             VideoTypes = [];
             Years = [];
             SkipDeserialization = false;
+            AudioLanguages = [];
+            SubtitleLanguages = [];
         }
 
         public InternalItemsQuery(User? user)
@@ -263,6 +266,12 @@ namespace MediaBrowser.Controller.Entities
 
         public Guid[] AncestorIds { get; set; }
 
+        /// <summary>
+        /// Gets or sets a list of ancestor ids that the item's linked children must descend from.
+        /// Useful for filtering BoxSets/Playlists to only those that contain items from a specific library.
+        /// </summary>
+        public Guid[] LinkedChildAncestorIds { get; set; }
+
         public Guid[] TopParentIds { get; set; }
 
         public CollectionType?[] PresetViews { get; set; }
@@ -387,6 +396,10 @@ namespace MediaBrowser.Controller.Entities
 
         public bool IncludeExtras { get; set; }
 
+        public IReadOnlyList<string> AudioLanguages { get; set; }
+
+        public IReadOnlyList<string> SubtitleLanguages { get; set; }
+
         public void SetUser(User user)
         {
             var maxRating = user.MaxParentalRatingScore;
diff --git a/MediaBrowser.Controller/Entities/TV/Episode.cs b/MediaBrowser.Controller/Entities/TV/Episode.cs
index dbe6f94dfd..42e4f79942 100644
--- a/MediaBrowser.Controller/Entities/TV/Episode.cs
+++ b/MediaBrowser.Controller/Entities/TV/Episode.cs
@@ -153,6 +153,12 @@ namespace MediaBrowser.Controller.Entities.TV
             return 16.0 / 9;
         }
 
+        /// <inheritdoc />
+        public override string GetInheritedOriginalLanguage()
+        {
+            return OriginalLanguage ?? Series?.GetInheritedOriginalLanguage();
+        }
+
         public override List<string> GetUserDataKeys()
         {
             var list = base.GetUserDataKeys();
diff --git a/MediaBrowser.Controller/Entities/TV/Season.cs b/MediaBrowser.Controller/Entities/TV/Season.cs
index f70f7dfb4c..e96ed05a5e 100644
--- a/MediaBrowser.Controller/Entities/TV/Season.cs
+++ b/MediaBrowser.Controller/Entities/TV/Season.cs
@@ -128,6 +128,12 @@ namespace MediaBrowser.Controller.Entities.TV
             return result;
         }
 
+        /// <inheritdoc />
+        public override string GetInheritedOriginalLanguage()
+        {
+            return OriginalLanguage ?? Series?.GetInheritedOriginalLanguage();
+        }
+
         public override string CreatePresentationUniqueKey()
         {
             if (IndexNumber.HasValue)
diff --git a/MediaBrowser.Controller/Entities/TagExtensions.cs b/MediaBrowser.Controller/Entities/TagExtensions.cs
index c1e4d1db2f..4ddba9835b 100644
--- a/MediaBrowser.Controller/Entities/TagExtensions.cs
+++ b/MediaBrowser.Controller/Entities/TagExtensions.cs
@@ -25,7 +25,7 @@ namespace MediaBrowser.Controller.Entities
                 }
                 else
                 {
-                    item.Tags = [..current, name];
+                    item.Tags = [.. current, name];
                 }
             }
         }
diff --git a/MediaBrowser.Controller/Entities/Video.cs b/MediaBrowser.Controller/Entities/Video.cs
index 80bcd62dcd..44cae5197a 100644
--- a/MediaBrowser.Controller/Entities/Video.cs
+++ b/MediaBrowser.Controller/Entities/Video.cs
@@ -278,6 +278,17 @@ namespace MediaBrowser.Controller.Entities
             return linkedVersionCount + localVersionCount + 1;
         }
 
+        /// <inheritdoc />
+        public override string GetInheritedOriginalLanguage()
+        {
+            if (ExtraType.GetValueOrDefault() == Model.Entities.ExtraType.Trailer)
+            {
+                return GetOwner()?.GetInheritedOriginalLanguage();
+            }
+
+            return OriginalLanguage ?? GetOwner()?.GetInheritedOriginalLanguage();
+        }
+
         public override List<string> GetUserDataKeys()
         {
             var list = base.GetUserDataKeys();