feat: add IIntroProvider for Wholphin/cinema-mode compatibility

Registers TrailerIntroProvider as IIntroProvider. Queries fake-movie
items in the output folder and returns their local trailer extras
(LocalTrailers) as IntroInfo — mirroring jellyfin-plugin-cinemamode's
proven pattern so Wholphin plays the actual trailer, not the 3-second
black placeholder.

Recursion guard: items whose path starts with the output folder are
excluded from intro injection, so Wholphin's getIntros call on the
intro item itself returns empty. Server-scoped query bypasses library
visibility restrictions so hidden trailer libraries still work.

Adds TrailersPerMovie config option (default 1, 0 = disabled).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Configuration/PluginConfiguration.cs

@@ -38,5 +38,10 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Configuration
 
         /// <summary>Maximum trailers to keep on disk. Oldest are deleted first when exceeded. 0 = unlimited.</summary>
         public int MaxTotalTrailers { get; set; } = 50;
+
+        // ── IIntroProvider (Cinema Mode / Wholphin) ───────────────────────────
+
+        /// <summary>Number of trailers to inject before each movie via IIntroProvider. 0 = disabled.</summary>
+        public int TrailersPerMovie { get; set; } = 1;
     }
 }

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Configuration/config.html

@@ -217,6 +217,26 @@
                         </div>
                     </fieldset>
 
+                    <!-- Cinema Mode Integration -->
+                    <fieldset class="verticalSection verticalSection-extrabottompadding">
+                        <legend><h3 class="sectionTitle">Cinema Mode Integration</h3></legend>
+                        <p class="fieldDescription">
+                            When enabled, this plugin registers as an <strong>IIntroProvider</strong> and
+                            injects downloaded trailers before movies — compatible with Jellyfin's built-in
+                            cinema mode support and clients like Wholphin.
+                            The output folder must be added as a Jellyfin <strong>Movies</strong> library
+                            and scanned before trailers appear.
+                        </p>
+                        <div class="inputContainer">
+                            <label class="inputLabel inputLabelUnfocused" for="trailers-per-movie">Trailers per movie</label>
+                            <input type="number" id="trailers-per-movie" is="emby-input" min="0" max="10" />
+                            <div class="fieldDescription">
+                                Number of trailers to play before each movie. Set to 0 to disable.
+                                Default: 1.
+                            </div>
+                        </div>
+                    </fieldset>
+
                     <!-- Advanced -->
                     <fieldset class="verticalSection verticalSection-extrabottompadding">
                         <legend><h3 class="sectionTitle">Advanced</h3></legend>
@@ -264,6 +284,7 @@
                             document.getElementById('lang-' + code).checked = langs.length === 0 || langs.indexOf(code) !== -1;
                         });
                     document.getElementById('max-total-trailers').value     = config.MaxTotalTrailers ?? 50;
+                    document.getElementById('trailers-per-movie').value     = config.TrailersPerMovie ?? 1;
                     Dashboard.hideLoadingMsg();
                 });
             });
@@ -291,6 +312,7 @@
                     // If all are checked treat it as "no preference" (empty string)
                     config.AllowedLanguages       = checkedLangs.length === allLangCodes.length ? '' : checkedLangs.join(',');
                     config.MaxTotalTrailers       = parseInt(document.getElementById('max-total-trailers').value, 10) || 50;
+                    config.TrailersPerMovie       = parseInt(document.getElementById('trailers-per-movie').value, 10) || 0;
                     ApiClient.updatePluginConfiguration(pluginId, config)
                         .then(Dashboard.processPluginConfigurationUpdateResult);
                 });

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Jellyfin.Plugin.CinemaTrailers4Jellyfins.csproj

@@ -3,8 +3,8 @@
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>Jellyfin.Plugin.CinemaTrailers4Jellyfins</RootNamespace>
-    <AssemblyVersion>1.0.0.0</AssemblyVersion>
-    <FileVersion>1.0.0.0</FileVersion>
+    <AssemblyVersion>1.0.0.2</AssemblyVersion>
+    <FileVersion>1.0.0.2</FileVersion>
     <Nullable>enable</Nullable>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>

Jellyfin.Plugin.CinemaTrailers4Jellyfins/PluginServiceRegistrator.cs

@@ -1,6 +1,7 @@
 using Jellyfin.Plugin.CinemaTrailers4Jellyfins.ScheduledTasks;
 using Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services;
 using MediaBrowser.Controller;
+using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Plugins;
 using MediaBrowser.Model.Tasks;
 using Microsoft.Extensions.DependencyInjection;
@@ -15,6 +16,7 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins
             serviceCollection.AddSingleton<TrailerDownloadService>();
             serviceCollection.AddSingleton<FakeMovieService>();
             serviceCollection.AddTransient<IScheduledTask, DownloadTrailersTask>();
+            serviceCollection.AddTransient<IIntroProvider, TrailerIntroProvider>();
         }
     }
 }

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Services/FakeMovieService.cs

@@ -97,13 +97,19 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
                     "-shortest",
                     "-c:v libx264 -tune stillimage -pix_fmt yuv420p",
                     "-c:a aac -b:a 64k",
+                    "-f mp4",
                     $"\"{tempPath}\"");
 
+                // Prefer Jellyfin's bundled ffmpeg; fall back to whatever is on PATH.
+                var ffmpegPath = File.Exists("/usr/lib/jellyfin-ffmpeg/ffmpeg")
+                    ? "/usr/lib/jellyfin-ffmpeg/ffmpeg"
+                    : "ffmpeg";
+
                 using var process = new Process
                 {
                     StartInfo = new ProcessStartInfo
                     {
-                        FileName = "ffmpeg",
+                        FileName = ffmpegPath,
                         Arguments = args,
                         RedirectStandardOutput = true,
                         RedirectStandardError = true,
@@ -135,7 +141,7 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
             }
             catch (Exception ex)
             {
-                _logger.LogError(ex, "|CinemaTrailers4Jellyfins| Failed to generate the master fake-movie file. Is ffmpeg installed and on PATH?");
+                _logger.LogError(ex, "|CinemaTrailers4Jellyfins| Failed to generate the master fake-movie file.");
                 return false;
             }
             finally

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Services/TrailerIntroProvider.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations.Entities;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Movies;
+using MediaBrowser.Controller.Library;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
+{
+    public class TrailerIntroProvider : IIntroProvider
+    {
+        private static readonly Random _rng = new();
+        private readonly ILibraryManager _libraryManager;
+        private readonly ILogger<TrailerIntroProvider> _logger;
+
+        public string Name => "CinemaTrailers4Jellyfins";
+
+        public TrailerIntroProvider(ILibraryManager libraryManager, ILogger<TrailerIntroProvider> logger)
+        {
+            _libraryManager = libraryManager;
+            _logger = logger;
+        }
+
+        public Task<IEnumerable<IntroInfo>> GetIntros(BaseItem item, User user)
+        {
+            var config = Plugin.Instance?.Configuration;
+            if (config == null || config.TrailersPerMovie <= 0)
+                return Task.FromResult(Enumerable.Empty<IntroInfo>());
+
+            if (item is not Movie)
+                return Task.FromResult(Enumerable.Empty<IntroInfo>());
+
+            var outputFolder = config.DownloadFolder?.TrimEnd(
+                Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+            if (string.IsNullOrEmpty(outputFolder))
+                return Task.FromResult(Enumerable.Empty<IntroInfo>());
+
+            // Break potential recursion: don't inject intros before items that live inside
+            // our output folder. This covers both the fake-movie files and their trailer
+            // extras, so Wholphin can't trigger a getIntros loop on the intro item itself.
+            if (item.Path?.StartsWith(outputFolder, StringComparison.OrdinalIgnoreCase) == true)
+                return Task.FromResult(Enumerable.Empty<IntroInfo>());
+
+            // Server-scoped query (no User parameter) so library visibility settings don't
+            // prevent trailer discovery even when the output library is hidden from users.
+            var fakeMovies = _libraryManager
+                .GetItemList(new InternalItemsQuery
+                {
+                    IncludeItemTypes = new[] { BaseItemKind.Movie },
+                    Recursive = true,
+                })
+                .OfType<Movie>()
+                .Where(m =>
+                    m.Path?.StartsWith(outputFolder, StringComparison.OrdinalIgnoreCase) == true
+                    && m.LocalTrailers.Count > 0)
+                .ToList();
+
+            if (fakeMovies.Count == 0)
+            {
+                _logger.LogDebug(
+                    "|CinemaTrailers4Jellyfins| No indexed trailers found in {Folder}. "
+                    + "Ensure the output folder is added as a Jellyfin Movies library and scanned.",
+                    outputFolder);
+                return Task.FromResult(Enumerable.Empty<IntroInfo>());
+            }
+
+            var selected = fakeMovies
+                .OrderBy(_ => _rng.Next())
+                .Take(config.TrailersPerMovie)
+                .Select(m =>
+                {
+                    var t = m.LocalTrailers.ElementAt(_rng.Next(m.LocalTrailers.Count));
+                    return new IntroInfo { ItemId = t.Id, Path = t.Path };
+                })
+                .ToList();
+
+            return Task.FromResult<IEnumerable<IntroInfo>>(selected);
+        }
+    }
+}

build.yaml

@@ -1,5 +1,5 @@
 ---
-version: 1.0.0.0
+version: 1.0.0.2
 name: CinemaTrailers4Jellyfins
 guid: b581493e-1046-40ed-b6dc-cb8027624984
 description: >
@@ -12,10 +12,10 @@ category: General
 owner: 514mart
 targetAbi: 10.11.0.0
 changelog:
-  - Initial release based on Trailers4Jellyfin — TMDB/YouTube trailer downloads,
-    scheduled task, language/date filters, and trailer rotation, repackaged so
-    each trailer ships inside its own fake-movie folder (placeholder video +
-    locked NFO + trailer) for use with a Cinema Mode pre-roll plugin
+  - Add IIntroProvider support — downloaded trailers now play as pre-rolls before
+    movies in Jellyfin clients with cinema mode (Wholphin, etc.); configurable
+    trailers-per-movie count; recursion-safe so the intro items themselves never
+    trigger a second round of intro injection
 
 dotnetProjects:
   - name: Jellyfin.Plugin.CinemaTrailers4Jellyfins

manifest.json

@@ -7,6 +7,23 @@
         "overview": "Builds a self-contained trailer library for Cinema Mode pre-roll plugins",
         "owner": "514mart",
         "imageUrl": "https://www.git.quarantinedstudio.com/mvezina/CinemaTrailers4Jellyfins/raw/branch/main/Jellyfin.Plugin.CinemaTrailers4Jellyfins/Images/logo.svg",
-        "versions": []
+        "versions": [
+            {
+                "checksum": "70edda53c848d5481223dda7afc763c2",
+                "changelog": "- Initial release based on Trailers4Jellyfin \u2014 TMDB/YouTube trailer downloads, scheduled task, language/date filters, and trailer rotation, repackaged so each trailer ships inside its own fake-movie folder (placeholder video + locked NFO + trailer) for use with a Cinema Mode pre-roll plugin\n",
+                "targetAbi": "10.11.0.0",
+                "sourceUrl": "https://www.git.quarantinedstudio.com/mvezina/CinemaTrailers4Jellyfins/releases/download/v1.0.0.1/cinematrailers4jellyfins_1.0.0.1.zip",
+                "timestamp": "2026-06-08T20:48:56Z",
+                "version": "1.0.0.1"
+            },
+            {
+                "checksum": "b8a6e246b2f07dadafb196c120dab2f6",
+                "changelog": "- Initial release based on Trailers4Jellyfin \u2014 TMDB/YouTube trailer downloads, scheduled task, language/date filters, and trailer rotation, repackaged so each trailer ships inside its own fake-movie folder (placeholder video + locked NFO + trailer) for use with a Cinema Mode pre-roll plugin\n",
+                "targetAbi": "10.11.0.0",
+                "sourceUrl": "https://www.git.quarantinedstudio.com/mvezina/CinemaTrailers4Jellyfins/releases/download/v1.0.0.0/cinematrailers4jellyfins_1.0.0.0.zip",
+                "timestamp": "2026-06-08T20:31:51Z",
+                "version": "1.0.0.0"
+            }
+        ]
     }
 ]