Update black frame and chapter analyzer

ConfusedPolarBear.Plugin.IntroSkipper/Analyzers/BlackFrameAnalyzer.cs

@@ -76,8 +76,10 @@ public class BlackFrameAnalyzer : IMediaFileAnalyzer
     /// <returns>Credits timestamp.</returns>
     public Intro? AnalyzeMediaFile(QueuedEpisode episode, AnalysisMode mode, int minimum)
     {
-        // Start by analyzing the last four minutes of the file.
-        var start = TimeSpan.FromMinutes(4);
+        var config = Plugin.Instance?.Configuration ?? new Configuration.PluginConfiguration();
+
+        // Start by analyzing the last N minutes of the file.
+        var start = TimeSpan.FromSeconds(config.MaximumEpisodeCreditsDuration);
         var end = TimeSpan.Zero;
         var firstFrameTime = 0.0;
 
@@ -100,7 +102,11 @@ public class BlackFrameAnalyzer : IMediaFileAnalyzer
                 tr.End);
 
             var frames = FFmpegWrapper.DetectBlackFrames(episode, tr, minimum);
-            _logger.LogTrace("{Episode}, black frames: {Count}", episode.Name, frames.Length);
+            _logger.LogTrace(
+                "{Episode} at {Start} has {Count} black frames",
+                episode.Name,
+                tr.Start,
+                frames.Length);
 
             if (frames.Length == 0)
             {

ConfusedPolarBear.Plugin.IntroSkipper/Analyzers/ChapterAnalyzer.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Globalization;
+using System.Linq;
 using System.Text.RegularExpressions;
 using System.Threading;
 using Microsoft.Extensions.Logging;
@@ -31,7 +32,6 @@ public class ChapterAnalyzer : IMediaFileAnalyzer
         AnalysisMode mode,
         CancellationToken cancellationToken)
     {
-        var unsuccessful = new List<QueuedEpisode>();
         var skippableRanges = new Dictionary<Guid, Intro>();
 
         var expression = mode == AnalysisMode.Introduction ?
@@ -53,7 +53,6 @@ public class ChapterAnalyzer : IMediaFileAnalyzer
 
             if (skipRange is null)
             {
-                unsuccessful.Add(episode);
                 continue;
             }
 
@@ -62,7 +61,10 @@ public class ChapterAnalyzer : IMediaFileAnalyzer
 
         Plugin.Instance!.UpdateTimestamps(skippableRanges, mode);
 
-        return unsuccessful.AsReadOnly();
+        return analysisQueue
+            .Where(x => !skippableRanges.ContainsKey(x.EpisodeId))
+            .ToList()
+            .AsReadOnly();
     }
 
     /// <summary>

ConfusedPolarBear.Plugin.IntroSkipper/Data/QueuedEpisode.cs

@@ -33,12 +33,12 @@ public class QueuedEpisode
     public string Name { get; set; } = string.Empty;
 
     /// <summary>
-    /// Gets or sets the timestamp (in seconds) to stop searching for an introduction.
+    /// Gets or sets the timestamp (in seconds) to stop searching for an introduction at.
     /// </summary>
     public int IntroFingerprintEnd { get; set; }
 
     /// <summary>
-    /// Gets or sets the timestamp (in seconds) to start looking for end credits.
+    /// Gets or sets the timestamp (in seconds) to start looking for end credits at.
     /// </summary>
     public int CreditsFingerprintStart { get; set; }