fix playout build failures due to playlist enumerator access (#2801)

CHANGELOG.md

@@ -55,6 +55,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Sync Plex episode title, plot, year, date added, release date, episode number changes
 - Sync Jellyfin and Emby library name and type changes
   - Library type (movies, shows) can only be changed when synchronization is *disabled* for the library in ETV
+- Fix some sequential and scripted playout build failures when using playlists or marathons
 
 ## [26.1.1] - 2026-01-08
 ### Fixed

ErsatzTV.Core/Scheduling/Engine/SchedulingEngine.cs

@@ -444,9 +444,13 @@ public class SchedulingEngine(
             return false;
         }
 
+        int enumeratorCount = enumeratorDetails.Enumerator is PlaylistEnumerator playlistEnumerator
+            ? playlistEnumerator.CountForFiller
+            : enumeratorDetails.Enumerator.Count;
+
         return AddCountInternal(
             enumeratorDetails,
-            enumeratorDetails.Enumerator.Count,
+            enumeratorCount,
             fillerKind,
             customTitle,
             disableWatermarks);

ErsatzTV.Core/Scheduling/YamlScheduling/Handlers/YamlPlayoutAllHandler.cs

@@ -31,7 +31,11 @@ public class YamlPlayoutAllHandler(EnumeratorCache enumeratorCache) : YamlPlayou
 
         foreach (IMediaCollectionEnumerator enumerator in maybeEnumerator)
         {
-            for (var i = 0; i < enumerator.Count; i++)
+            int enumeratorCount = enumerator is PlaylistEnumerator playlistEnumerator
+                ? playlistEnumerator.CountForFiller
+                : enumerator.Count;
+
+            for (var i = 0; i < enumeratorCount; i++)
             {
                 foreach (string preRollSequence in context.GetPreRollSequence())
                 {

ErsatzTV.Core/Scheduling/YamlScheduling/Handlers/YamlPlayoutSkipItemsHandler.cs

@@ -32,7 +32,7 @@ public class YamlPlayoutSkipItemsHandler(EnumeratorCache enumeratorCache) : IYam
             int seed = context.Playout.Seed + context.InstructionIndex + context.CurrentTime.DayOfYear;
             var random = new Random(seed);
             int enumeratorCount = enumerator is PlaylistEnumerator playlistEnumerator
-                ? playlistEnumerator.CountForRandom
+                ? playlistEnumerator.CountForFiller
                 : enumerator.Count;
             var expression = new Expression(skipItems.SkipItems);
             expression.EvaluateParameter += (name, e) =>
@@ -53,7 +53,7 @@ public class YamlPlayoutSkipItemsHandler(EnumeratorCache enumeratorCache) : IYam
                 _ => 0
             };
 
-            skipCount %= enumerator.Count;
+            skipCount %= enumeratorCount;
 
             if (skipCount < 0)
             {

ErsatzTV.Core/Scheduling/YamlScheduling/Handlers/YamlPlayoutSkipToItemHandler.cs

@@ -40,7 +40,12 @@ public class YamlPlayoutSkipToItemHandler(EnumeratorCache enumeratorCache) : IYa
         foreach (IMediaCollectionEnumerator enumerator in maybeEnumerator)
         {
             var done = false;
-            for (var index = 0; index < enumerator.Count; index++)
+
+            int enumeratorCount = enumerator is PlaylistEnumerator playlistEnumerator
+                ? playlistEnumerator.CountForFiller
+                : enumerator.Count;
+
+            for (var index = 0; index < enumeratorCount; index++)
             {
                 if (done)
                 {