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Add support for VobSub subtitle streams (#16552)

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* Add support for VobSub subtitle streams

* update logic to determine separate extraction for VobSub subtitles

* simplify VobSub extraction logic and fix ffmpeg command

* Match `ExtractAllExtractableSubtitlesMKS` with `ExtractAllExtractableSubtitlesInternal` Matroska's VobSub option

* Add a comments clarify why MKS was used, and remove the redundant VobSub extension branch

* remove redundant VobSub format check

* fix type errors
This commit is contained in:
Neptune
2026-05-31 22:18:25 +07:00
committed by GitHub
parent 13c6549b42
commit 6f0ff89bdc
4 changed files with 74 additions and 15 deletions
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36
MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
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@@ -220,12 +220,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles
Path = outputPath,
Protocol = MediaProtocol.File,
Format = outputFormat,
IsExternal = false
IsExternal = MediaStream.IsVobSubFormat(outputFormat)
};
}
var currentFormat = subtitleStream.Codec ?? Path.GetExtension(subtitleStream.Path)
.TrimStart('.');
var currentFormat = subtitleStream.Codec ?? Path.GetExtension(subtitleStream.Path).TrimStart('.');
// Handle PGS subtitles as raw streams for the client to render
if (MediaStream.IsPgsFormat(currentFormat))
@@ -475,6 +474,10 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
return subtitleStream.Codec;
}
else if (MediaStream.IsVobSubFormat(subtitleStream.Codec))
{
return "mks";
}
else
{
return "srt";
@@ -488,6 +491,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
return "sup";
}
else if (MediaStream.IsVobSubFormat(subtitleStream.Codec))
{
// FFmpeg cannot mux VobSub subtitle streams back into the .idx/.sub pair, so we use .mks container instead.
return "mks";
}
else
{
return GetExtractableSubtitleFormat(subtitleStream);
@@ -500,7 +508,8 @@ namespace MediaBrowser.MediaEncoding.Subtitles
|| string.Equals(codec, "ssa", StringComparison.OrdinalIgnoreCase)
|| string.Equals(codec, "srt", StringComparison.OrdinalIgnoreCase)
|| string.Equals(codec, "subrip", StringComparison.OrdinalIgnoreCase)
|| string.Equals(codec, "pgssub", StringComparison.OrdinalIgnoreCase);
|| string.Equals(codec, "pgssub", StringComparison.OrdinalIgnoreCase)
|| MediaStream.IsVobSubFormat(codec);
}
/// <inheritdoc />
@@ -516,7 +525,8 @@ namespace MediaBrowser.MediaEncoding.Subtitles
foreach (var subtitleStream in subtitleStreams)
{
if (subtitleStream.IsExternal && !subtitleStream.Path.EndsWith(".mks", StringComparison.OrdinalIgnoreCase))
if (subtitleStream.IsExternal
&& !subtitleStream.Path.EndsWith(".mks", StringComparison.OrdinalIgnoreCase))
{
continue;
}
@@ -603,6 +613,8 @@ 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);
if (streamIndex == -1)
@@ -616,9 +628,10 @@ namespace MediaBrowser.MediaEncoding.Subtitles
outputPaths.Add(outputPath);
args += string.Format(
CultureInfo.InvariantCulture,
" -map 0:{0} -an -vn -c:s {1} -flush_packets 1 \"{2}\"",
" -map 0:{0} -an -vn -c:s {1}{2} -flush_packets 1 \"{3}\"",
streamIndex,
outputCodec,
outputFormatOption,
outputPath);
}
@@ -653,6 +666,8 @@ 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);
if (streamIndex == -1)
@@ -666,18 +681,17 @@ namespace MediaBrowser.MediaEncoding.Subtitles
outputPaths.Add(outputPath);
args += string.Format(
CultureInfo.InvariantCulture,
" -map 0:{0} -an -vn -c:s {1} -flush_packets 1 \"{2}\"",
" -map 0:{0} -an -vn -c:s {1}{2} -flush_packets 1 \"{3}\"",
streamIndex,
outputCodec,
outputFormatOption,
outputPath);
}
if (outputPaths.Count == 0)
if (outputPaths.Count > 0)
{
return;
await ExtractSubtitlesForFile(inputPath, args, outputPaths, cancellationToken).ConfigureAwait(false);
}
await ExtractSubtitlesForFile(inputPath, args, outputPaths, cancellationToken).ConfigureAwait(false);
}
private async Task ExtractSubtitlesForFile(