Distribute a standalone Windows binary (single .exe) for ffsubsync

[xmha97]

Hello Stephen (and maintainers),

Thank you for ffsubsync — it's extremely useful.

I'd like to request an official standalone Windows binary (single .exe) distribution of ffsubsync, similar to how tools like yt-dlp provide prebuilt executables. This would help many Windows users who are not comfortable installing Python and dependencies with pip or setting up virtual environments.

Benefits:

• Much easier onboarding for non-Python users.
• Fewer issue reports caused by environment/dependency differences.
• Ability to provide signed releases for improved user trust.

Suggested implementation approach (minimal effort, well-tested path):

1. Use PyInstaller (or similar) to build a single-file Windows executable from the Python package. Many projects use this and you can automate builds in CI. ([GitHub][1])
2. Add a GitHub Actions workflow that runs on new releases and produces Windows artifacts (.exe) and uploads them to the release page. There are existing Actions and examples for PyInstaller on Windows. ([Medium][2])
3. Decide whether to bundle ffmpeg inside the exe or to document that the user must have ffmpeg available on PATH. Bundling makes the exe bigger but more user-friendly; requiring external ffmpeg keeps the binary smaller and avoids legal/distribution questions.
4. Optionally sign the Windows executable (code signing) to reduce Windows Defender / SmartScreen warnings.

Notes / references:

• I saw an independent single-file distribution repo for ffsubsync (ffsubsync-bin) which shows demand for an official binary. It might be useful as a reference. ([GitHub][3])
• Latest official ffsubsync repo and releases are here. ([GitHub][4])

If you’d like, I can:

• Open a draft issue or PR with a sample GitHub Actions workflow (PyInstaller) and a .spec suggestion.
• Produce a tested GitHub Actions YAML to build & attach a Windows .exe on each release.

Thanks again for the great tool!