Use ActivatorUtilities to construct MediaEncoder and update constructor to inject EncodingHelper correctly

Emby.Server.Implementations/ApplicationHost.cs

@@ -88,7 +88,6 @@ using MediaBrowser.Model.Configuration;
 using MediaBrowser.Model.Cryptography;
 using MediaBrowser.Model.Diagnostics;
 using MediaBrowser.Model.Dlna;
-using MediaBrowser.Model.Events;
 using MediaBrowser.Model.Globalization;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.MediaInfo;
@@ -106,7 +105,6 @@ using MediaBrowser.WebDashboard.Api;
 using MediaBrowser.XbmcMetadata.Providers;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Extensions;
-using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using OperatingSystem = MediaBrowser.Common.System.OperatingSystem;
@@ -614,17 +612,11 @@ namespace Emby.Server.Implementations
             serviceCollection.AddTransient(provider => new Lazy<IDtoService>(provider.GetRequiredService<IDtoService>));
             serviceCollection.AddSingleton<IUserManager, UserManager>();
 
-            // TODO: Add StartupOptions.FFmpegPath to IConfiguration so this doesn't need to be constructed manually
+            // TODO: Refactor to eliminate the circular dependency here so that Lazy<T> isn't required
+            // TODO: Add StartupOptions.FFmpegPath to IConfiguration and remove this custom activation
+            serviceCollection.AddTransient(provider => new Lazy<EncodingHelper>(provider.GetRequiredService<EncodingHelper>));
             serviceCollection.AddSingleton<IMediaEncoder>(provider =>
-                new MediaBrowser.MediaEncoding.Encoder.MediaEncoder(
-                    provider.GetRequiredService<ILogger<MediaBrowser.MediaEncoding.Encoder.MediaEncoder>>(),
-                    provider.GetRequiredService<IServerConfigurationManager>(),
-                    provider.GetRequiredService<IFileSystem>(),
-                    provider.GetRequiredService<IProcessFactory>(),
-                    provider.GetRequiredService<ILocalizationManager>(),
-                    provider.GetRequiredService<ISubtitleEncoder>,
-                    provider.GetRequiredService<IConfiguration>(),
-                    _startupOptions.FFmpegPath));
+                ActivatorUtilities.CreateInstance<MediaBrowser.MediaEncoding.Encoder.MediaEncoder>(provider, _startupOptions.FFmpegPath ?? string.Empty));
 
             // TODO: Refactor to eliminate the circular dependencies here so that Lazy<T> isn't required
             serviceCollection.AddTransient(provider => new Lazy<ILibraryMonitor>(provider.GetRequiredService<ILibraryMonitor>));

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -40,8 +40,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
         private readonly IFileSystem _fileSystem;
         private readonly IProcessFactory _processFactory;
         private readonly ILocalizationManager _localization;
-        private readonly Func<ISubtitleEncoder> _subtitleEncoder;
-        private readonly IConfiguration _configuration;
+        private readonly Lazy<EncodingHelper> _encodingHelperFactory;
         private readonly string _startupOptionFFmpegPath;
 
         private readonly SemaphoreSlim _thumbnailResourcePool = new SemaphoreSlim(2, 2);
@@ -49,8 +48,6 @@ namespace MediaBrowser.MediaEncoding.Encoder
         private readonly object _runningProcessesLock = new object();
         private readonly List<ProcessWrapper> _runningProcesses = new List<ProcessWrapper>();
 
-        private EncodingHelper _encodingHelper;
-
         private string _ffmpegPath;
         private string _ffprobePath;
 
@@ -60,8 +57,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             IFileSystem fileSystem,
             IProcessFactory processFactory,
             ILocalizationManager localization,
-            Func<ISubtitleEncoder> subtitleEncoder,
-            IConfiguration configuration,
+            Lazy<EncodingHelper> encodingHelperFactory,
             string startupOptionsFFmpegPath)
         {
             _logger = logger;
@@ -69,15 +65,11 @@ namespace MediaBrowser.MediaEncoding.Encoder
             _fileSystem = fileSystem;
             _processFactory = processFactory;
             _localization = localization;
+            _encodingHelperFactory = encodingHelperFactory;
             _startupOptionFFmpegPath = startupOptionsFFmpegPath;
-            _subtitleEncoder = subtitleEncoder;
-            _configuration = configuration;
         }
 
-        private EncodingHelper EncodingHelper
-            => LazyInitializer.EnsureInitialized(
-                ref _encodingHelper,
-                () => new EncodingHelper(this, _fileSystem, _subtitleEncoder(), _configuration));
+        private EncodingHelper EncodingHelper => _encodingHelperFactory.Value;
 
         /// <inheritdoc />
         public string EncoderPath => _ffmpegPath;