From 7dc6544d3441187f73393dac54dc358b3ceb98ed Mon Sep 17 00:00:00 2001
From: klizas <klizas@users.noreply.github.com>
Date: Mon, 5 Oct 2026 19:18:45 -0400
Subject: Backport pull request #18186 from jellyfin/release-12.z

Fix segment cleaner deleting segments ahead of playback when remuxing MKV

Original-merge: 3acc9c8443d7ee445c4fe015f2977a47d4ea57ac

Merged-by: crobibero <cody@robibe.ro>

Backported-by: Cody Robibero <cody@robibe.ro>
---
 .../MediaEncoding/TranscodingSegmentCleaner.cs                    | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

(limited to 'MediaBrowser.Controller/MediaEncoding/TranscodingSegmentCleaner.cs')

diff --git a/MediaBrowser.Controller/MediaEncoding/TranscodingSegmentCleaner.cs b/MediaBrowser.Controller/MediaEncoding/TranscodingSegmentCleaner.cs
index 67bfcb02fd..924fc2e659 100644
--- a/MediaBrowser.Controller/MediaEncoding/TranscodingSegmentCleaner.cs
+++ b/MediaBrowser.Controller/MediaEncoding/TranscodingSegmentCleaner.cs
@@ -22,7 +22,6 @@ public class TranscodingSegmentCleaner : IDisposable
     private readonly IFileSystem _fileSystem;
     private readonly IMediaEncoder _mediaEncoder;
     private Timer? _timer;
-    private int _segmentLength;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="TranscodingSegmentCleaner"/> class.
@@ -32,7 +31,7 @@ public class TranscodingSegmentCleaner : IDisposable
     /// <param name="config">Instance of the <see cref="IConfigurationManager"/> interface.</param>
     /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
     /// <param name="mediaEncoder">Instance of the <see cref="IMediaEncoder"/> interface.</param>
-    /// <param name="segmentLength">The segment length of this transcoding job.</param>
+    /// <param name="segmentLength">The segment length of this transcoding job. Unused.</param>
     public TranscodingSegmentCleaner(TranscodingJob job, ILogger<TranscodingSegmentCleaner> logger, IConfigurationManager config, IFileSystem fileSystem, IMediaEncoder mediaEncoder, int segmentLength)
     {
         _job = job;
@@ -40,7 +39,6 @@ public class TranscodingSegmentCleaner : IDisposable
         _config = config;
         _fileSystem = fileSystem;
         _mediaEncoder = mediaEncoder;
-        _segmentLength = segmentLength;
     }
 
     /// <summary>
@@ -104,11 +102,11 @@ public class TranscodingSegmentCleaner : IDisposable
 
             if (downloadPositionSeconds > 0 && segmentKeepSeconds > 0 && downloadPositionSeconds > segmentKeepSeconds)
             {
-                var idxMaxToDelete = (downloadPositionSeconds - segmentKeepSeconds) / _segmentLength;
+                var idxMaxToDelete = _job.GetHighestServedSegmentIndexEndingAtOrBefore(downloadPositionTicks - TimeSpan.FromSeconds(segmentKeepSeconds).Ticks);
 
                 if (idxMaxToDelete > 0)
                 {
-                    await DeleteSegmentFiles(_job, 0, idxMaxToDelete, 1500).ConfigureAwait(false);
+                    await DeleteSegmentFiles(_job, 0, idxMaxToDelete.Value, 1500).ConfigureAwait(false);
                 }
             }
         }
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