fix: don't extract embedded subtitles that have already been extracted (#2873)

CHANGELOG.md

@@ -7,11 +7,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 - Add `Streaming Engine` setting to Channel
   - `Legacy` - (default) uses existing streaming engine
-  - `Next` - will use ErsatzTV Next streaming engine, when it is compatible with ErsatzTV Legacy
+  - `Next` - uses ErsatzTV Next streaming engine
 
 ### Fixed
 - Fix `Add Playout` button not opening drop down menu (regression from v26.4.0)
 - Consistently apply playout offset when generating XMLTV
+- Schedule all required fallback filler in classic schedules
+- Don't extract embedded subtitles that have already been extracted
 
 ## [26.4.0] - 2026-04-18
 ### Changed

ErsatzTV.Application/Subtitles/Commands/ExtractEmbeddedSubtitlesHandlerBase.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.IO.Abstractions;
 using System.Security.Cryptography;
@@ -11,6 +12,7 @@ using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
+using Humanizer;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 
@@ -97,6 +99,8 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
         {
             foreach (List<Subtitle> allSubtitles in GetSubtitles(mediaItem))
             {
+                var sw = Stopwatch.StartNew();
+
                 var subtitlesToExtract = new List<SubtitleToExtract>();
 
                 // find each subtitle that needs extraction
@@ -129,6 +133,11 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
                     .Add("-hide_banner")
                     .Add("-i").Add(mediaItemPath);
 
+                var subtitleIndexes = subtitlesToExtract
+                    .OrderBy(s => s.Subtitle.StreamIndex)
+                    .Select(s => s.Subtitle.StreamIndex)
+                    .ToList();
+
                 foreach (SubtitleToExtract subtitle in subtitlesToExtract)
                 {
                     string fullOutputPath = Path.Combine(FileSystemLayout.SubtitleCacheFolder, subtitle.OutputPath);
@@ -138,7 +147,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
                         File.Delete(fullOutputPath);
                     }
 
-                    args.Add("-map").Add($"0:{subtitle.Subtitle.StreamIndex}")
+                    args.Add("-map").Add($"0:s:{subtitleIndexes.IndexOf(subtitle.Subtitle.StreamIndex)}")
                         .Add("-c:s").Add(subtitle.Subtitle.Codec == "mov_text" ? "text" : "copy")
                         .Add(fullOutputPath);
                 }
@@ -148,6 +157,8 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
                     .WithValidation(CommandResultValidation.None)
                     .ExecuteBufferedAsync(cancellationToken);
 
+                sw.Stop();
+
                 if (result.ExitCode == 0)
                 {
                     foreach (SubtitleToExtract subtitle in subtitlesToExtract)
@@ -157,11 +168,17 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
                             new { SubtitleId = subtitle.Subtitle.Id, Path = subtitle.OutputPath });
                     }
 
-                    logger.LogDebug("Successfully extracted {Count} subtitles", subtitlesToExtract.Count);
+                    logger.LogDebug(
+                        "Successfully extracted {Count} subtitles in {Duration}",
+                        subtitlesToExtract.Count,
+                        sw.Elapsed.Humanize());
                 }
                 else
                 {
-                    logger.LogError("Failed to extract subtitles. {Error}", result.StandardError);
+                    logger.LogError(
+                        "Failed to extract subtitles in {Duration}. {Error}",
+                        sw.Elapsed.Humanize(),
+                        result.StandardError);
                 }
             }
         }
@@ -300,7 +317,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem
     {
         foreach (string path in GetRelativeOutputPath(mediaItemId, subtitle))
         {
-            return !fileSystem.File.Exists(path);
+            return !fileSystem.File.Exists(Path.Combine(FileSystemLayout.SubtitleCacheFolder, path));
         }
 
         return false;