subs2srs (GTK4 port)

A tool that creates Anki flashcards from movies and TV shows with subtitles, for language learning.

This is a GTK4 / .NET 10 rewrite of the UI layer. The processing core (subtitle parsing, ffmpeg calls, SRS generation) is carried over from the original with minimal changes.

Credits

• Christopher Brochtrup — original author
• erjiang — Linux/Mono port
• nihil-admirari — updated dependencies

What changed from the Mono/WinForms version

Area	Old (erjiang fork)	This port
UI toolkit	WinForms on Mono	GTK4 via GirCore
Runtime	Mono	.NET 10+
System.Drawing	Required everywhere	Removed — SrsColor, FontInfo used instead
Serialization	BinaryFormatter	System.Text.Json (ObjectCloner)
Preferences format	Custom key = value text with regex updates	JSON (preferences.json)
Progress dialogs	BackgroundWorker + modal DialogProgress	async/await + IProgressReporter
PropertyGrid (Preferences)	WinForms PropertyGrid	ColumnView with editable cells
Preview dialog	BackgroundWorker (deadlocked on Wayland)	Task.Run + async
Font/Color pickers	WinForms dialogs	FontDialogButton / ColorDialogButton (native GTK4)
VobSub support	Built-in	Optional (compile with EnableVobSub=true)
MS fonts	Required fontconfig workaround	Not needed
Build system	mcs / xbuild	dotnet publish via Makefile

Removed components

• SubsReTimer — separate tool, not part of this port
• DialogAbout — removed (was WinForms bitmap-based)
• DialogPreviewSnapshot — merged into DialogPreview
• DialogVideoDimensionsChooser — removed (size set directly in settings)
• GroupBoxCheck — WinForms custom control, not needed in GTK

Dependencies

Runtime:

• .NET 10+ runtime
• GTK 4
• ffmpeg
• mp3gain (only if using audio normalization)
• mkvtoolnix (mkvextract, mkvinfo) (only for MKV track extraction)

Build:

• .NET 10+ SDK

Optional:

• noto-fonts-cjk — for Japanese/Chinese/Korean text

Build

make build

Test

make test

Install

AUR

yay -S subs2srs-gui

Manual

git clone https://github.com/ajatt-tools/subs2srs.git
cd subs2srs
sudo make install

Installs to /usr/lib/subs2srs/, launcher to /usr/bin/subs2srs.

Uninstall

sudo make uninstall

Configuration

On first run, preferences.json is created in ~/.config/subs2srs/.

If a preferences.txt from a previous version exists in the same directory, it is automatically migrated to JSON on first launch. The old file is left intact.

Projects are saved as .s2s.json files (File → Save/Load Project).

Edit preferences via Preferences dialog or by editing preferences.json directly.

Adding a new preference

1. Add default constant to PrefDefaults
2. Add property to PreferencesData.cs with default from PrefDefaults
3. Add delegating property to ConstantSettings
4. Add to DialogPref.BuildPropTable() + DialogPref.SavePreferences()
5. Add to Logger.writeSettingsToLog()
6. If the preference maps to Settings.Instance, add to Settings.Reset()

Parallelism

Set max_parallel_tasks in Preferences → Misc (or in preferences.json):

• 0 — auto (number of CPU cores, default)
• 1 — sequential (no parallelism)
• N — use up to N threads for media generation

Building with VobSub support

VobSub (.sub/.idx) parsing requires System.Drawing.Common and is disabled by default. To enable:

dotnet publish subs2srs/subs2srs.csproj -c Release -p:EnableVobSub=true

License

GPL-3.0-or-later