Write subtitles using SubtitleEdit (#16805)

* Write subtitles using SubtitleEdit

We've been using SubtitleEdit to parse since 2021
https://github.com/jellyfin/jellyfin/pull/4984

I think it's time we start using it to write too

* Clean up ConvertSubtitles

* Add JsonWriter back

8 files changed, 79 insertions, 369 deletions

diff --git a/MediaBrowser.MediaEncoding/Subtitles/AssWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/AssWriter.cs
deleted file mode 100644
index 7d7b80e99d..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/AssWriter.cs
+++ /dev/null
@@ -1,57 +0,0 @@
-using System;
-using System.Globalization;
-using System.IO;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// ASS subtitle writer.
-    /// </summary>
-    public partial class AssWriter : ISubtitleWriter
-    {
-        [GeneratedRegex(@"\n", RegexOptions.IgnoreCase)]
-        private static partial Regex NewLineRegex();
-
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
-        {
-            using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
-            {
-                var trackEvents = info.TrackEvents;
-                var timeFormat = @"hh\:mm\:ss\.ff";
-
-                // Write ASS header
-                writer.WriteLine("[Script Info]");
-                writer.WriteLine("Title: Jellyfin transcoded ASS subtitle");
-                writer.WriteLine("ScriptType: v4.00+");
-                writer.WriteLine();
-                writer.WriteLine("[V4+ Styles]");
-                writer.WriteLine("Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding");
-                writer.WriteLine("Style: Default,Arial,20,&H00FFFFFF,&H00FFFFFF,&H19333333,&H910E0807,0,0,0,0,100,100,0,0,0,1,0,2,10,10,10,1");
-                writer.WriteLine();
-                writer.WriteLine("[Events]");
-                writer.WriteLine("Format: Layer, Start, End, Style, Text");
-
-                for (int i = 0; i < trackEvents.Count; i++)
-                {
-                    cancellationToken.ThrowIfCancellationRequested();
-
-                    var trackEvent = trackEvents[i];
-                    var startTime = TimeSpan.FromTicks(trackEvent.StartPositionTicks).ToString(timeFormat, CultureInfo.InvariantCulture);
-                    var endTime = TimeSpan.FromTicks(trackEvent.EndPositionTicks).ToString(timeFormat, CultureInfo.InvariantCulture);
-                    var text = NewLineRegex().Replace(trackEvent.Text, "\\n");
-
-                    writer.WriteLine(
-                        "Dialogue: 0,{0},{1},Default,{2}",
-                        startTime,
-                        endTime,
-                        text);
-                }
-            }
-        }
-    }
-}
diff --git a/MediaBrowser.MediaEncoding/Subtitles/ISubtitleWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/ISubtitleWriter.cs
deleted file mode 100644
index dec714121d..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/ISubtitleWriter.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-using System.IO;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// Interface ISubtitleWriter.
-    /// </summary>
-    public interface ISubtitleWriter
-    {
-        /// <summary>
-        /// Writes the specified information.
-        /// </summary>
-        /// <param name="info">The information.</param>
-        /// <param name="stream">The stream.</param>
-        /// <param name="cancellationToken">The cancellation token.</param>
-        void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken);
-    }
-}
diff --git a/MediaBrowser.MediaEncoding/Subtitles/JsonWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/JsonWriter.cs
index 1b452b0cec..0e40181016 100644
--- a/MediaBrowser.MediaEncoding/Subtitles/JsonWriter.cs
+++ b/MediaBrowser.MediaEncoding/Subtitles/JsonWriter.cs
@@ -1,44 +1,58 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
 using System.IO;
+using System.Text;
 using System.Text.Json;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
+using Nikse.SubtitleEdit.Core.Common;
+using Nikse.SubtitleEdit.Core.SubtitleFormats;
 
-namespace MediaBrowser.MediaEncoding.Subtitles
+namespace MediaBrowser.MediaEncoding.Subtitles;
+
+/// <summary>
+/// JSON subtitle writer.
+/// </summary>
+public class JsonWriter : SubtitleFormat
 {
-    /// <summary>
-    /// JSON subtitle writer.
-    /// </summary>
-    public class JsonWriter : ISubtitleWriter
+    /// <inheritdoc />
+    public override string Extension => ".json";
+
+    /// <inheritdoc />
+    public override string Name => "JSON Jellyfin";
+
+    /// <inheritdoc />
+    public override string ToText(Subtitle subtitle, string title)
     {
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
+        using var ms = new MemoryStream();
+        using (var writer = new Utf8JsonWriter(ms))
         {
-            using (var writer = new Utf8JsonWriter(stream))
+            var trackevents = subtitle.Paragraphs;
+            writer.WriteStartObject();
+            writer.WriteStartArray("TrackEvents");
+
+            for (int i = 0; i < trackevents.Count; i++)
             {
-                var trackevents = info.TrackEvents;
+                var current = trackevents[i];
                 writer.WriteStartObject();
-                writer.WriteStartArray("TrackEvents");
-
-                for (int i = 0; i < trackevents.Count; i++)
-                {
-                    cancellationToken.ThrowIfCancellationRequested();
-
-                    var current = trackevents[i];
-                    writer.WriteStartObject();
 
-                    writer.WriteString("Id", current.Id);
-                    writer.WriteString("Text", current.Text);
-                    writer.WriteNumber("StartPositionTicks", current.StartPositionTicks);
-                    writer.WriteNumber("EndPositionTicks", current.EndPositionTicks);
+                writer.WriteString("Id", current.Number.ToString(CultureInfo.InvariantCulture));
+                writer.WriteString("Text", current.Text);
+                writer.WriteNumber("StartPositionTicks", current.StartTime.TimeSpan.Ticks);
+                writer.WriteNumber("EndPositionTicks", current.EndTime.TimeSpan.Ticks);
 
-                    writer.WriteEndObject();
-                }
-
-                writer.WriteEndArray();
                 writer.WriteEndObject();
-
-                writer.Flush();
             }
+
+            writer.WriteEndArray();
+            writer.WriteEndObject();
+
+            writer.Flush();
         }
+
+        return Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Length);
     }
+
+    /// <inheritdoc />
+    public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
+        => throw new NotImplementedException();
 }
diff --git a/MediaBrowser.MediaEncoding/Subtitles/SrtWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/SrtWriter.cs
deleted file mode 100644
index 86f77aa067..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/SrtWriter.cs
+++ /dev/null
@@ -1,49 +0,0 @@
-using System;
-using System.Globalization;
-using System.IO;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// SRT subtitle writer.
-    /// </summary>
-    public partial class SrtWriter : ISubtitleWriter
-    {
-        [GeneratedRegex(@"\\n", RegexOptions.IgnoreCase)]
-        private static partial Regex NewLineEscapedRegex();
-
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
-        {
-            using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
-            {
-                var trackEvents = info.TrackEvents;
-
-                for (int i = 0; i < trackEvents.Count; i++)
-                {
-                    cancellationToken.ThrowIfCancellationRequested();
-
-                    var trackEvent = trackEvents[i];
-
-                    writer.WriteLine((i + 1).ToString(CultureInfo.InvariantCulture));
-                    writer.WriteLine(
-                        @"{0:hh\:mm\:ss\,fff} --> {1:hh\:mm\:ss\,fff}",
-                        TimeSpan.FromTicks(trackEvent.StartPositionTicks),
-                        TimeSpan.FromTicks(trackEvent.EndPositionTicks));
-
-                    var text = trackEvent.Text;
-
-                    // TODO: Not sure how to handle these
-                    text = NewLineEscapedRegex().Replace(text, " ");
-
-                    writer.WriteLine(text);
-                    writer.WriteLine();
-                }
-            }
-        }
-    }
-}
diff --git a/MediaBrowser.MediaEncoding/Subtitles/SsaWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/SsaWriter.cs
deleted file mode 100644
index b5fd1ed935..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/SsaWriter.cs
+++ /dev/null
@@ -1,57 +0,0 @@
-using System;
-using System.Globalization;
-using System.IO;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// SSA subtitle writer.
-    /// </summary>
-    public partial class SsaWriter : ISubtitleWriter
-    {
-        [GeneratedRegex(@"\n", RegexOptions.IgnoreCase)]
-        private static partial Regex NewLineRegex();
-
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
-        {
-            using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
-            {
-                var trackEvents = info.TrackEvents;
-                var timeFormat = @"hh\:mm\:ss\.ff";
-
-                // Write SSA header
-                writer.WriteLine("[Script Info]");
-                writer.WriteLine("Title: Jellyfin transcoded SSA subtitle");
-                writer.WriteLine("ScriptType: v4.00");
-                writer.WriteLine();
-                writer.WriteLine("[V4 Styles]");
-                writer.WriteLine("Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, TertiaryColour, BackColour, Bold, Italic, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding");
-                writer.WriteLine("Style: Default,Arial,20,&H00FFFFFF,&H00FFFFFF,&H19333333,&H19333333,0,0,0,1,0,2,10,10,10,0,1");
-                writer.WriteLine();
-                writer.WriteLine("[Events]");
-                writer.WriteLine("Format: Layer, Start, End, Style, Text");
-
-                for (int i = 0; i < trackEvents.Count; i++)
-                {
-                    cancellationToken.ThrowIfCancellationRequested();
-
-                    var trackEvent = trackEvents[i];
-                    var startTime = TimeSpan.FromTicks(trackEvent.StartPositionTicks).ToString(timeFormat, CultureInfo.InvariantCulture);
-                    var endTime = TimeSpan.FromTicks(trackEvent.EndPositionTicks).ToString(timeFormat, CultureInfo.InvariantCulture);
-                    var text = NewLineRegex().Replace(trackEvent.Text, "\\n");
-
-                    writer.WriteLine(
-                        "Dialogue: 0,{0},{1},Default,{2}",
-                        startTime,
-                        endTime,
-                        text);
-                }
-            }
-        }
-    }
-}
diff --git a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
index 8d237473a3..ddb078127b 100644
--- a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
+++ b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
@@ -26,7 +26,10 @@ using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.MediaInfo;
 using Microsoft.Extensions.Logging;
+using Nikse.SubtitleEdit.Core.Common;
+using Nikse.SubtitleEdit.Core.SubtitleFormats;
 using UtfUnknown;
+using SubtitleFormat = MediaBrowser.Model.MediaInfo.SubtitleFormat;
 
 namespace MediaBrowser.MediaEncoding.Subtitles
 {
@@ -72,55 +75,42 @@ namespace MediaBrowser.MediaEncoding.Subtitles
 
         private MemoryStream ConvertSubtitles(
             Stream stream,
-            string inputFormat,
+            SubtitleInfo inputInfo,
             string outputFormat,
             long startTimeTicks,
             long endTimeTicks,
-            bool preserveOriginalTimestamps,
-            CancellationToken cancellationToken)
+            bool preserveOriginalTimestamps)
         {
-            var ms = new MemoryStream();
-
-            try
-            {
-                var trackInfo = _subtitleParser.Parse(stream, inputFormat);
+            var subtitle = Subtitle.Parse(stream, Path.GetExtension(inputInfo.Path));
 
-                FilterEvents(trackInfo, startTimeTicks, endTimeTicks, preserveOriginalTimestamps);
+            FilterEvents(subtitle, startTimeTicks, endTimeTicks, preserveOriginalTimestamps);
 
-                var writer = GetWriter(outputFormat);
+            var formatter = GetWriter(outputFormat);
 
-                writer.Write(trackInfo, ms, cancellationToken);
-                ms.Position = 0;
-            }
-            catch
-            {
-                ms.Dispose();
-                throw;
-            }
+            var text = formatter.ToText(subtitle, "untitled");
+            var bytes = Encoding.UTF8.GetBytes(text);
 
-            return ms;
+            return new MemoryStream(bytes, 0, bytes.Length, false, true);
         }
 
-        internal void FilterEvents(SubtitleTrackInfo track, long startPositionTicks, long endTimeTicks, bool preserveTimestamps)
+        internal void FilterEvents(Subtitle track, long startPositionTicks, long endTimeTicks, bool preserveTimestamps)
         {
             // Drop subs that have fully elapsed before the requested start position
-            track.TrackEvents = track.TrackEvents
-                .SkipWhile(i => (i.StartPositionTicks - startPositionTicks) < 0 && (i.EndPositionTicks - startPositionTicks) < 0)
-                .ToArray();
+            track.Paragraphs
+                .RemoveAll(i => (i.StartTime.TimeSpan.Ticks - startPositionTicks) < 0 && (i.EndTime.TimeSpan.Ticks - startPositionTicks) < 0);
 
             if (endTimeTicks > 0)
             {
-                track.TrackEvents = track.TrackEvents
-                    .TakeWhile(i => i.StartPositionTicks <= endTimeTicks)
-                    .ToArray();
+                track.Paragraphs
+                    .RemoveAll(i => i.StartTime.TimeSpan.Ticks > endTimeTicks);
             }
 
             if (!preserveTimestamps)
             {
-                foreach (var trackEvent in track.TrackEvents)
+                foreach (var trackEvent in track.Paragraphs)
                 {
-                    trackEvent.EndPositionTicks = Math.Max(0, trackEvent.EndPositionTicks - startPositionTicks);
-                    trackEvent.StartPositionTicks = Math.Max(0, trackEvent.StartPositionTicks - startPositionTicks);
+                    trackEvent.StartTime = new TimeCode(TimeSpan.FromTicks(Math.Max(0, trackEvent.StartTime.TimeSpan.Ticks - startPositionTicks)));
+                    trackEvent.EndTime = new TimeCode(TimeSpan.FromTicks(Math.Max(0, trackEvent.EndTime.TimeSpan.Ticks - startPositionTicks)));
                 }
             }
         }
@@ -142,14 +132,14 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             var subtitleStream = mediaSource.MediaStreams
                .First(i => i.Type == MediaStreamType.Subtitle && i.Index == subtitleStreamIndex);
 
-            var (stream, inputFormat) = await GetSubtitleStream(mediaSource, subtitleStream, cancellationToken)
+            var (stream, info) = await GetSubtitleStream(mediaSource, subtitleStream, cancellationToken)
                         .ConfigureAwait(false);
 
             // Return the original if the same format is being requested
             // Character encoding was already handled in GetSubtitleStream
             // ASS is a superset of SSA, skipping the conversion and preserving the styles
-            if (string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase)
-                || (string.Equals(inputFormat, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase)
+            if (string.Equals(info.Format, outputFormat, StringComparison.OrdinalIgnoreCase)
+                || (string.Equals(info.Format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase)
                     && string.Equals(outputFormat, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase)))
             {
                 return stream;
@@ -157,11 +147,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles
 
             using (stream)
             {
-                return ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, endTimeTicks, preserveOriginalTimestamps, cancellationToken);
+                return ConvertSubtitles(stream, info, outputFormat, startTimeTicks, endTimeTicks, preserveOriginalTimestamps);
             }
         }
 
-        private async Task<(Stream Stream, string Format)> GetSubtitleStream(
+        private async Task<(Stream Stream, SubtitleInfo Info)> GetSubtitleStream(
             MediaSourceInfo mediaSource,
             MediaStream subtitleStream,
             CancellationToken cancellationToken)
@@ -170,7 +160,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
 
             var stream = await GetSubtitleStream(fileInfo, cancellationToken).ConfigureAwait(false);
 
-            return (stream, fileInfo.Format);
+            return (stream, fileInfo);
         }
 
         private async Task<Stream> GetSubtitleStream(SubtitleInfo fileInfo, CancellationToken cancellationToken)
@@ -266,13 +256,13 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             };
         }
 
-        private bool TryGetWriter(string format, [NotNullWhen(true)] out ISubtitleWriter? value)
+        private bool TryGetWriter(string format, [NotNullWhen(true)] out Nikse.SubtitleEdit.Core.SubtitleFormats.SubtitleFormat? value)
         {
             ArgumentException.ThrowIfNullOrEmpty(format);
 
             if (string.Equals(format, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase))
             {
-                value = new AssWriter();
+                value = new AdvancedSubStationAlpha();
                 return true;
             }
 
@@ -282,27 +272,29 @@ namespace MediaBrowser.MediaEncoding.Subtitles
                 return true;
             }
 
-            if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase) || string.Equals(format, SubtitleFormat.SUBRIP, StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase)
+                || string.Equals(format, SubtitleFormat.SUBRIP, StringComparison.OrdinalIgnoreCase))
             {
-                value = new SrtWriter();
+                value = new SubRip();
                 return true;
             }
 
             if (string.Equals(format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase))
             {
-                value = new SsaWriter();
+                value = new SubStationAlpha();
                 return true;
             }
 
-            if (string.Equals(format, SubtitleFormat.VTT, StringComparison.OrdinalIgnoreCase) || string.Equals(format, SubtitleFormat.WEBVTT, StringComparison.OrdinalIgnoreCase))
+            if (string.Equals(format, SubtitleFormat.VTT, StringComparison.OrdinalIgnoreCase)
+                || string.Equals(format, SubtitleFormat.WEBVTT, StringComparison.OrdinalIgnoreCase))
             {
-                value = new VttWriter();
+                value = new WebVTT();
                 return true;
             }
 
             if (string.Equals(format, SubtitleFormat.TTML, StringComparison.OrdinalIgnoreCase))
             {
-                value = new TtmlWriter();
+                value = new TimedText10();
                 return true;
             }
 
@@ -310,7 +302,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             return false;
         }
 
-        private ISubtitleWriter GetWriter(string format)
+        private Nikse.SubtitleEdit.Core.SubtitleFormats.SubtitleFormat GetWriter(string format)
         {
             if (TryGetWriter(format, out var writer))
             {
diff --git a/MediaBrowser.MediaEncoding/Subtitles/TtmlWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/TtmlWriter.cs
deleted file mode 100644
index ea45f2070a..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/TtmlWriter.cs
+++ /dev/null
@@ -1,60 +0,0 @@
-using System.IO;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// TTML subtitle writer.
-    /// </summary>
-    public partial class TtmlWriter : ISubtitleWriter
-    {
-        [GeneratedRegex(@"\\n", RegexOptions.IgnoreCase)]
-        private static partial Regex NewLineEscapeRegex();
-
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
-        {
-            // Example: https://github.com/zmalltalker/ttml2vtt/blob/master/data/sample.xml
-            // Parser example: https://github.com/mozilla/popcorn-js/blob/master/parsers/parserTTML/popcorn.parserTTML.js
-
-            using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
-            {
-                writer.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
-                writer.WriteLine("<tt xmlns=\"http://www.w3.org/ns/ttml\" xmlns:tts=\"http://www.w3.org/2006/04/ttaf1#styling\" lang=\"no\">");
-
-                writer.WriteLine("<head>");
-                writer.WriteLine("<styling>");
-                writer.WriteLine("<style id=\"italic\" tts:fontStyle=\"italic\" />");
-                writer.WriteLine("<style id=\"left\" tts:textAlign=\"left\" />");
-                writer.WriteLine("<style id=\"center\" tts:textAlign=\"center\" />");
-                writer.WriteLine("<style id=\"right\" tts:textAlign=\"right\" />");
-                writer.WriteLine("</styling>");
-                writer.WriteLine("</head>");
-
-                writer.WriteLine("<body>");
-                writer.WriteLine("<div>");
-
-                foreach (var trackEvent in info.TrackEvents)
-                {
-                    var text = trackEvent.Text;
-
-                    text = NewLineEscapeRegex().Replace(text, "<br/>");
-
-                    writer.WriteLine(
-                        "<p begin=\"{0}\" dur=\"{1}\">{2}</p>",
-                        trackEvent.StartPositionTicks,
-                        trackEvent.EndPositionTicks - trackEvent.StartPositionTicks,
-                        text);
-                }
-
-                writer.WriteLine("</div>");
-                writer.WriteLine("</body>");
-
-                writer.WriteLine("</tt>");
-            }
-        }
-    }
-}
diff --git a/MediaBrowser.MediaEncoding/Subtitles/VttWriter.cs b/MediaBrowser.MediaEncoding/Subtitles/VttWriter.cs
deleted file mode 100644
index 3e0f47b5ae..0000000000
--- a/MediaBrowser.MediaEncoding/Subtitles/VttWriter.cs
+++ /dev/null
@@ -1,53 +0,0 @@
-using System;
-using System.IO;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading;
-using MediaBrowser.Model.MediaInfo;
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    /// <summary>
-    /// Subtitle writer for the WebVTT format.
-    /// </summary>
-    public partial class VttWriter : ISubtitleWriter
-    {
-        [GeneratedRegex(@"\\n", RegexOptions.IgnoreCase)]
-        private static partial Regex NewlineEscapeRegex();
-
-        /// <inheritdoc />
-        public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
-        {
-            using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
-            {
-                writer.WriteLine("WEBVTT");
-                writer.WriteLine();
-                writer.WriteLine("Region: id:subtitle width:80% lines:3 regionanchor:50%,100% viewportanchor:50%,90%");
-                writer.WriteLine();
-                foreach (var trackEvent in info.TrackEvents)
-                {
-                    cancellationToken.ThrowIfCancellationRequested();
-
-                    var startTime = TimeSpan.FromTicks(trackEvent.StartPositionTicks);
-                    var endTime = TimeSpan.FromTicks(trackEvent.EndPositionTicks);
-
-                    // make sure the start and end times are different and sequential
-                    if (endTime.TotalMilliseconds <= startTime.TotalMilliseconds)
-                    {
-                        endTime = startTime.Add(TimeSpan.FromMilliseconds(1));
-                    }
-
-                    writer.WriteLine(@"{0:hh\:mm\:ss\.fff} --> {1:hh\:mm\:ss\.fff} region:subtitle line:90%", startTime, endTime);
-
-                    var text = trackEvent.Text;
-
-                    // TODO: Not sure how to handle these
-                    text = NewlineEscapeRegex().Replace(text, " ");
-
-                    writer.WriteLine(text);
-                    writer.WriteLine();
-                }
-            }
-        }
-    }
-}