smacke/ffsubsync
Automagically synchronize subtitles with video. observed · 2026-08-28
Health v2 · maintenance only
84/100
- Activity 94
- Release rhythm 62
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: 205
- age_days: 2747
- days_rel: 40
- days_push: 40
- n_releases_24m: 4
Adoption not part of the score
7854 stars · 322 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
FFsubsync is a Python command-line tool that automatically synchronizes subtitle files (e.g., SRT) with video or audio, using voice activity detection and FFT-based audio analysis or a reference subtitle. It also offers a browser-based version that runs entirely client-side via ffmpeg.wasm.
Use cases
- sync subtitles with a video automatically
- fix subtitles that are offset from the movie audio
- align srt file to correct starting point in video
- resync downloaded subtitles to my video file
- sync subtitles using a correctly-timed reference subtitle
- batch sync subtitles from the command line
- sync subtitles in the browser without installing anything
When to choose
- you have mistimed subtitles and want automatic, language-agnostic alignment
- you want a scriptable CLI tool for bulk subtitle syncing
- you prefer a no-install browser option that keeps files local
When to avoid
- you need to translate, edit, or author subtitles rather than just time-shift them
- you need a GUI subtitle editor with visual timeline adjustment
- your video has no speech and no reference subtitle to sync against
Facets
cli-tool · maturity active
audio-processing speech-recognition cli developer-tools media developer-tools python cli cross-platform browser windows subtitles srt ffmpeg subtitle-sync voice-activity-detection captions vlc video audio command-line macos linux
2 sources
- readme: https://github.com/smacke/ffsubsync · fetched 2026-08-28 · bd8048763033
- registry_pypi: https://pypi.org/pypi/ffsubsync/json · fetched 2026-08-29 · e54cf1b5dbb0
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| smacke/ffsubsync | main | 84 |
For agents
markdown · JSON · MCP: product_card(name="smacke/ffsubsync")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem