reduce scanning overhead a bit

4 files changed, 20 insertions, 28 deletions

diff --git a/MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs b/MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs
index 08e2eb774..709c21f50 100644
--- a/MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs
+++ b/MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs
@@ -55,7 +55,7 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
         /// <summary>
         /// The audio image resource pool
         /// </summary>
-        private readonly SemaphoreSlim _audioImageResourcePool = new SemaphoreSlim(2, 2);
+        private readonly SemaphoreSlim _audioImageResourcePool = new SemaphoreSlim(1, 1);
 
         /// <summary>
         /// The _subtitle extraction resource pool
diff --git a/MediaBrowser.Server.Implementations/ScheduledTasks/AudioImagesTask.cs b/MediaBrowser.Server.Implementations/ScheduledTasks/AudioImagesTask.cs
index db809a47b..66ca9db9a 100644
--- a/MediaBrowser.Server.Implementations/ScheduledTasks/AudioImagesTask.cs
+++ b/MediaBrowser.Server.Implementations/ScheduledTasks/AudioImagesTask.cs
@@ -147,6 +147,8 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
                 {
                     // Image is already in the cache
                     item.PrimaryImagePath = path;
+
+                    await _libraryManager.SaveItem(item, cancellationToken).ConfigureAwait(false);
                 }
             }
 
diff --git a/MediaBrowser.Server.Implementations/ScheduledTasks/ChapterImagesTask.cs b/MediaBrowser.Server.Implementations/ScheduledTasks/ChapterImagesTask.cs
index d46d4ec8a..7f158f1f2 100644
--- a/MediaBrowser.Server.Implementations/ScheduledTasks/ChapterImagesTask.cs
+++ b/MediaBrowser.Server.Implementations/ScheduledTasks/ChapterImagesTask.cs
@@ -2,6 +2,7 @@
 using MediaBrowser.Controller;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.Logging;
 using System;
 using System.Collections.Generic;
@@ -60,40 +61,27 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <param name="progress">The progress.</param>
         /// <returns>Task.</returns>
-        public Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
+        public async Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
         {
-            var videos = _libraryManager.RootFolder.RecursiveChildren.OfType<Video>().Where(v => v.Chapters != null).ToList();
+            var videos = _libraryManager.RootFolder.RecursiveChildren
+                .OfType<Video>()
+                .Where(v => v.Chapters != null && v.Chapters.Count != 0)
+                .ToList();
 
             var numComplete = 0;
 
-            var tasks = videos.Select(v => Task.Run(async () =>
+            foreach (var video in videos)
             {
-                try
-                {
-                    await _kernel.FFMpegManager.PopulateChapterImages(v, cancellationToken, true, true);
-                }
-                catch (OperationCanceledException)
-                {
-                    throw;
-                }
-                catch (Exception ex)
-                {
-                    _logger.ErrorException("Error creating chapter images for {0}", ex, v.Name);
-                }
-                finally
-                {
-                    lock (progress)
-                    {
-                        numComplete++;
-                        double percent = numComplete;
-                        percent /= videos.Count;
+                cancellationToken.ThrowIfCancellationRequested();
+
+                await _kernel.FFMpegManager.PopulateChapterImages(video, cancellationToken, true, true);
 
-                        progress.Report(100 * percent);
-                    }
-                }
-            }));
+                numComplete++;
+                double percent = numComplete;
+                percent /= videos.Count;
 
-            return Task.WhenAll(tasks);
+                progress.Report(100 * percent);
+            }
         }
 
         /// <summary>
diff --git a/MediaBrowser.Server.Implementations/ScheduledTasks/VideoImagesTask.cs b/MediaBrowser.Server.Implementations/ScheduledTasks/VideoImagesTask.cs
index a82c22fe9..a995f1a47 100644
--- a/MediaBrowser.Server.Implementations/ScheduledTasks/VideoImagesTask.cs
+++ b/MediaBrowser.Server.Implementations/ScheduledTasks/VideoImagesTask.cs
@@ -176,6 +176,8 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
                 {
                     // Image is already in the cache
                     item.PrimaryImagePath = path;
+
+                    await _libraryManager.SaveItem(item, cancellationToken).ConfigureAwait(false);
                 }
             }