From 6e3c1874936b767754cd9267749f35b27f2ae65f Mon Sep 17 00:00:00 2001 From: Piotr Niełacny Date: Wed, 15 Jul 2026 14:55:55 +0200 Subject: Fix race condition in concurrent subtitle conversion SubtitleEncoder.ConvertSubtitles parsed subtitles with libse's static Subtitle.Parse, which iterates a statically cached list of shared SubtitleFormat instances. Format parsers keep mutable per-parse state on the instance, so concurrent subtitle requests corrupted each other's output (cues mixed across streams and languages, truncated files) or failed with NullReferenceException when format detection broke down and Subtitle.Parse returned null. Parse through the injected ISubtitleParser instead. SubtitleEditParser instantiates a fresh format parser per call, so requests no longer share state. Its Parse method now returns the libse Subtitle directly (the SubtitleTrackInfo flattening was unused since the SubtitleEdit writer rework) so the writers keep full fidelity such as ASS styling. --- .../Subtitles/SubtitleEditParser.cs | 20 ++------------------ 1 file changed, 2 insertions(+), 18 deletions(-) (limited to 'MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs') diff --git a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs index d060b247da..d75eea5904 100644 --- a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs +++ b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs @@ -1,10 +1,8 @@ using System; using System.Collections.Generic; -using System.Globalization; using System.IO; using System.Linq; using Jellyfin.Extensions; -using MediaBrowser.Model.MediaInfo; using Microsoft.Extensions.Logging; using Nikse.SubtitleEdit.Core.Common; using SubtitleFormat = Nikse.SubtitleEdit.Core.SubtitleFormats.SubtitleFormat; @@ -30,7 +28,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles } /// - public SubtitleTrackInfo Parse(Stream stream, string fileExtension) + public Subtitle Parse(Stream stream, string fileExtension) { var subtitle = new Subtitle(); var lines = stream.ReadAllLines().ToList(); @@ -76,21 +74,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles throw new ArgumentException("Unsupported format: " + fileExtension); } - var trackInfo = new SubtitleTrackInfo(); - int len = subtitle.Paragraphs.Count; - var trackEvents = new SubtitleTrackEvent[len]; - for (int i = 0; i < len; i++) - { - var p = subtitle.Paragraphs[i]; - trackEvents[i] = new SubtitleTrackEvent(p.Number.ToString(CultureInfo.InvariantCulture), p.Text) - { - StartPositionTicks = p.StartTime.TimeSpan.Ticks, - EndPositionTicks = p.EndTime.TimeSpan.Ticks - }; - } - - trackInfo.TrackEvents = trackEvents; - return trackInfo; + return subtitle; } /// -- cgit v1.2.3