1 files changed, 111 insertions, 0 deletions
diff --git a/src/Jellyfin.MediaEncoding.Hls/ScheduledTasks/KeyframeExtractionScheduledTask.cs b/src/Jellyfin.MediaEncoding.Hls/ScheduledTasks/KeyframeExtractionScheduledTask.cs
new file mode 100644
index 000000000..03acc6911
--- /dev/null
+++ b/src/Jellyfin.MediaEncoding.Hls/ScheduledTasks/KeyframeExtractionScheduledTask.cs
@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Data.Enums;
+using Jellyfin.MediaEncoding.Hls.Extractors;
+using MediaBrowser.Controller.Dto;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Globalization;
+using MediaBrowser.Model.Tasks;
+
+namespace Jellyfin.MediaEncoding.Hls.ScheduledTasks;
+
+/// <inheritdoc />
+public class KeyframeExtractionScheduledTask : IScheduledTask
+{
+    private const int Pagesize = 1000;
+
+    private readonly ILocalizationManager _localizationManager;
+    private readonly ILibraryManager _libraryManager;
+    private readonly IKeyframeExtractor[] _keyframeExtractors;
+    private static readonly BaseItemKind[] _itemTypes = { BaseItemKind.Episode, BaseItemKind.Movie };
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="KeyframeExtractionScheduledTask"/> class.
+    /// </summary>
+    /// <param name="localizationManager">An instance of the <see cref="ILocalizationManager"/> interface.</param>
+    /// <param name="libraryManager">An instance of the <see cref="ILibraryManager"/> interface.</param>
+    /// <param name="keyframeExtractors">The keyframe extractors.</param>
+    public KeyframeExtractionScheduledTask(ILocalizationManager localizationManager, ILibraryManager libraryManager, IEnumerable<IKeyframeExtractor> keyframeExtractors)
+    {
+        _localizationManager = localizationManager;
+        _libraryManager = libraryManager;
+        _keyframeExtractors = keyframeExtractors.OrderByDescending(e => e.IsMetadataBased).ToArray();
+    }
+
+    /// <inheritdoc />
+    public string Name => "Keyframe Extractor";
+
+    /// <inheritdoc />
+    public string Key => "KeyframeExtraction";
+
+    /// <inheritdoc />
+    public string Description => "Extracts keyframes from video files to create more precise HLS playlists. This task may run for a long time.";
+
+    /// <inheritdoc />
+    public string Category => _localizationManager.GetLocalizedString("TasksLibraryCategory");
+
+    /// <inheritdoc />
+    public Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
+    {
+        var query = new InternalItemsQuery
+        {
+            MediaTypes = new[] { MediaType.Video },
+            IsVirtualItem = false,
+            IncludeItemTypes = _itemTypes,
+            DtoOptions = new DtoOptions(true),
+            SourceTypes = new[] { SourceType.Library },
+            Recursive = true,
+            Limit = Pagesize
+        };
+
+        var numberOfVideos = _libraryManager.GetCount(query);
+
+        var startIndex = 0;
+        var numComplete = 0;
+
+        while (startIndex < numberOfVideos)
+        {
+            query.StartIndex = startIndex;
+
+            var videos = _libraryManager.GetItemList(query);
+            var currentPageCount = videos.Count;
+            // TODO parallelize with Parallel.ForEach?
+            for (var i = 0; i < currentPageCount; i++)
+            {
+                var video = videos[i];
+                // Only local files supported
+                if (video.IsFileProtocol && File.Exists(video.Path))
+                {
+                    for (var j = 0; j < _keyframeExtractors.Length; j++)
+                    {
+                        var extractor = _keyframeExtractors[j];
+                        // The cache decorator will make sure to save them in the data dir
+                        if (extractor.TryExtractKeyframes(video.Path, out _))
+                        {
+                            break;
+                        }
+                    }
+                }
+
+                // Update progress
+                numComplete++;
+                double percent = (double)numComplete / numberOfVideos;
+                progress.Report(100 * percent);
+            }
+
+            startIndex += Pagesize;
+        }
+
+        progress.Report(100);
+        return Task.CompletedTask;
+    }
+
+    /// <inheritdoc />
+    public IEnumerable<TaskTriggerInfo> GetDefaultTriggers() => Enumerable.Empty<TaskTriggerInfo>();
+}