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Match and mux in dropped external subtitles

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Drag in subtitle files alongside .mkv files and they're matched to
the right video by episode code (S04E06, zero-padding and separator
insensitive, plus 4x06 as a fallback) and muxed in as extra subtitle
tracks. Any subtitle format mkvmerge accepts is recognized: SRT,
(S)SA, VobSub, WebVTT, PGS/SUP, USF, SAMI, TTML/DFXP, STL, Kate.

Matching works regardless of drop order — subtitles dropped before
their video are held pending until a matching video shows up, and
vice versa. Language, forced, and SDH flags are guessed from common
filename tokens (e.g. "eng", "forced", "sdh") to set the muxed
track's language/name/flags; unmatched subtitles are reported in the
status bar.
This commit is contained in:
l4kr
2026-07-08 10:37:56 +02:00
parent 304d9ad047
commit c7c125d40b
9 changed files with 511 additions and 21 deletions
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Services/MkvService.cs
+43 -4
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@@ -258,12 +258,13 @@ public class MkvService
IReadOnlyList<int> videoKeepIds,
IReadOnlyList<int> audioKeepIds,
IReadOnlyList<int> subtitleKeepIds,
IReadOnlyList<ExternalSubtitleTrack>? externalSubtitles = null,
IProgress<ProcessingProgress>? progress = null,
CancellationToken ct = default)
{
return StripTracksInternalAsync(
filePath, Path.GetFileName(filePath), outputFilePath,
videoKeepIds, audioKeepIds, subtitleKeepIds,
videoKeepIds, audioKeepIds, subtitleKeepIds, externalSubtitles,
progress, ct);
}
@@ -281,6 +282,7 @@ public class MkvService
null, // null = keep all video
scan.AudioKeepIds,
scan.SubtitleKeepIds,
null,
progress, ct);
}
@@ -386,6 +388,7 @@ public class MkvService
IReadOnlyList<int>? videoKeepIds,
IReadOnlyList<int>? audioKeepIds,
IReadOnlyList<int>? subtitleKeepIds,
IReadOnlyList<ExternalSubtitleTrack>? externalSubtitles,
IProgress<ProcessingProgress>? progress,
CancellationToken ct)
{
@@ -422,16 +425,52 @@ public class MkvService
AddTrackTypeArgs(psi, "--audio-tracks", "--no-audio", audioKeepIds);
AddTrackTypeArgs(psi, "--subtitle-tracks", "--no-subtitles", subtitleKeepIds);
// The one subtitle track the user chose to keep is always flagged
// as the default subtitle track in the output.
// Only one subtitle track in the whole output should ever be
// flagged default. If any external subtitle is marked default,
// it takes priority over the kept internal subtitle track.
bool hasExternalDefault = externalSubtitles != null && externalSubtitles.Any(s => s.IsDefault);
if (subtitleKeepIds != null && subtitleKeepIds.Count == 1)
{
psi.ArgumentList.Add("--default-track-flag");
psi.ArgumentList.Add($"{subtitleKeepIds[0]}:yes");
psi.ArgumentList.Add(hasExternalDefault ? $"{subtitleKeepIds[0]}:no" : $"{subtitleKeepIds[0]}:yes");
}
psi.ArgumentList.Add(filePath);
// Append each matched external subtitle file as its own input,
// with per-file options (language/name/flags) scoped to it.
if (externalSubtitles != null)
{
foreach (var sub in externalSubtitles)
{
if (!string.IsNullOrEmpty(sub.Language) && !string.Equals(sub.Language, "und", StringComparison.OrdinalIgnoreCase))
{
psi.ArgumentList.Add("--language");
psi.ArgumentList.Add($"0:{sub.Language}");
}
if (!string.IsNullOrWhiteSpace(sub.TrackName))
{
psi.ArgumentList.Add("--track-name");
psi.ArgumentList.Add($"0:{sub.TrackName}");
}
if (sub.Forced)
{
psi.ArgumentList.Add("--forced-display-flag");
psi.ArgumentList.Add("0:yes");
}
if (sub.HearingImpaired)
{
psi.ArgumentList.Add("--hearing-impaired-flag");
psi.ArgumentList.Add("0:yes");
}
psi.ArgumentList.Add("--default-track-flag");
psi.ArgumentList.Add(sub.IsDefault ? "0:yes" : "0:no");
psi.ArgumentList.Add(sub.FilePath);
}
}
using var process = new Process { StartInfo = psi };
process.Start();