From 0b20d7a05bb174181ef56e9c2ee08a590a74528e Mon Sep 17 00:00:00 2001
From: Oskar Bali <51484222+Oggeb1@users.noreply.github.com>
Date: Wed, 19 Aug 2026 11:29:52 +0200
Subject: Fix BDMV PGS subtitles with TrueHD

Add myself CONTRIBUTORS.md
---
 CONTRIBUTORS.md                                       |  1 +
 .../MediaEncoding/EncodingHelper.cs                   | 19 ++++++++++++++++++-
 .../Subtitles/SubtitleEncoder.cs                      |  4 ++--
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 99f24e3a14..a97d335170 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -240,6 +240,7 @@
  - [Florin-Popescu](https://github.com/Florin-Popescu)
  - [m0g3r](https://github.com/m0g3r)
  - [martin-77](https://github.com/martin-77)
+ - [Oggeb1](https://github.com/Oggeb1)
 
 # Emby Contributors
 
diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 9a68889352..9e6d4a2899 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -6311,7 +6311,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                         string.Join(',', overlayFilters));
 
                 var mapPrefix = Convert.ToInt32(state.SubtitleStream.IsExternal);
-                var subtitleStreamIndex = FindIndex(state.MediaSource.MediaStreams, state.SubtitleStream);
+                var subtitleStreamIndex = GetSubtitleStreamIndexForFfmpeg(state.MediaSource, state.SubtitleStream);
                 var videoStreamIndex = FindIndex(state.MediaSource.MediaStreams, state.VideoStream);
 
                 if (hasSubs)
@@ -7943,6 +7943,23 @@ namespace MediaBrowser.Controller.MediaEncoding
             return -1;
         }
 
+        public static int GetSubtitleStreamIndexForFfmpeg(MediaSourceInfo mediaSource, MediaStream subtitleStream)
+        {
+            var index = FindIndex(mediaSource.MediaStreams, subtitleStream);
+            if (index == -1 || mediaSource.VideoType != VideoType.BluRay)
+            {
+                return index;
+            }
+
+            var hiddenStreamsBefore = mediaSource.MediaStreams.Count(s =>
+                s.Type == MediaStreamType.Audio
+                && (string.Equals(s.Codec, "truehd", StringComparison.OrdinalIgnoreCase)
+                    || string.Equals(s.Codec, "atmos", StringComparison.OrdinalIgnoreCase))
+                && s.Index < subtitleStream.Index);
+
+            return index + hiddenStreamsBefore;
+        }
+
         public static bool IsCopyCodec(string codec)
         {
             return string.Equals(codec, "copy", StringComparison.OrdinalIgnoreCase);
diff --git a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
index bd516f0a9f..e733cfd8ac 100644
--- a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
+++ b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
@@ -648,7 +648,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             List<MediaStream> subtitleStreams,
             CancellationToken cancellationToken)
         {
-            var inputPath = _mediaEncoder.GetInputArgument(mediaSource.Path, mediaSource);
+            var inputPath = _mediaEncoder.GetInputPathArgument(mediaSource.Path, mediaSource);
             var outputPaths = new List<string>();
             var args = string.Format(
                 CultureInfo.InvariantCulture,
@@ -672,7 +672,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
                 var outputCodec = IsCodecCopyable(subtitleStream.Codec) ? "copy" : "srt";
                 // FFmpeg does not provide an .idx/.sub muxer, so VobSub streams must be written as MKS files.
                 var outputFormatOption = MediaStream.IsVobSubFormat(subtitleStream.Codec) ? " -f matroska" : string.Empty;
-                var streamIndex = EncodingHelper.FindIndex(mediaSource.MediaStreams, subtitleStream);
+                var streamIndex = EncodingHelper.GetSubtitleStreamIndexForFfmpeg(mediaSource, subtitleStream);
 
                 if (streamIndex == -1)
                 {
-- 
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