Add minimum end credit duration

ConfusedPolarBear.Plugin.IntroSkipper.Tests/TestBlackFrames.cs

@@ -30,6 +30,8 @@ public class TestBlackFrames
     [FactSkipFFmpegTests]
     public void TestEndCreditDetection()
     {
+        var range = 1;
+
         var analyzer = CreateBlackFrameAnalyzer();
 
         var episode = queueFile("credits.mp4");
@@ -37,7 +39,7 @@ public class TestBlackFrames
 
         var result = analyzer.AnalyzeMediaFile(episode, AnalysisMode.Credits, 85);
         Assert.NotNull(result);
-        Assert.Equal(300, result.IntroStart);
+        Assert.InRange(result.IntroStart, 300 - range, 300 + range);
     }
 
     private QueuedEpisode queueFile(string path)

ConfusedPolarBear.Plugin.IntroSkipper/Analyzers/BlackFrameAnalyzer.cs

@@ -80,7 +80,7 @@ public class BlackFrameAnalyzer : IMediaFileAnalyzer
 
         // Start by analyzing the last N minutes of the file.
         var start = TimeSpan.FromSeconds(config.MaximumEpisodeCreditsDuration);
-        var end = TimeSpan.Zero;
+        var end = TimeSpan.FromSeconds(config.MinimumCreditsDuration);
         var firstFrameTime = 0.0;
 
         // Continue bisecting the end of the file until the range that contains the first black

ConfusedPolarBear.Plugin.IntroSkipper/Configuration/PluginConfiguration.cs

@@ -72,6 +72,11 @@ public class PluginConfiguration : BasePluginConfiguration
     /// </summary>
     public int MaximumIntroDuration { get; set; } = 120;
 
+    /// <summary>
+    /// Gets or sets the minimum length of similar audio that will be considered ending credits.
+    /// </summary>
+    public int MinimumCreditsDuration { get; set; } = 15;
+
     /// <summary>
     /// Gets or sets the upper limit (in seconds) on the length of each episode's audio track that will be analyzed when searching for ending credits.
     /// </summary>