# Bundled binaries

AeroFetch spawns these from the **main process**. `yt-dlp.exe` (and optional
`aria2c.exe`) ship in the installer via electron-builder `extraResources` (outside the
asar archive) and are committed here so a fresh clone builds and runs.

`ffmpeg.exe` + `ffprobe.exe` are **NOT shipped in the installer** — they're the bulk of
its size, so they're downloaded on first run into `userData/bin` (see
`src/main/ffmpegSetup.ts`, pinned in `src/main/config.ts`). The copies here are used only
as a **dev seed** — `ensureManagedFfmpeg` copies them into `userData/bin` so `npm run dev`
needs no download — and are excluded from the shipped build.

```
resources/bin/
├── yt-dlp.exe     (bundled + committed)
├── ffmpeg.exe     (dev seed only — excluded from the installer)
├── ffprobe.exe    (dev seed only — excluded from the installer)
└── aria2c.exe     (optional, bundled)
```

## yt-dlp.exe

- Download: https://github.com/yt-dlp/yt-dlp/releases/latest
- Grab `yt-dlp.exe`.
- Unlicense / public domain.

## ffmpeg.exe + ffprobe.exe (dev seed only)

- The app downloads these on first run from the pinned upstream archive in
  `src/main/config.ts` (`FFMPEG_ARCHIVE_URL` + `FFMPEG_ARCHIVE_SHA256`). To bump the
  version, edit those constants — recompute the SHA-256 from the new zip — in their own
  commit (the "pinned decisions" discipline).
- For local dev, drop **both** `ffmpeg.exe` and `ffprobe.exe` here — they come together in
  the same archive's `bin/` folder and their versions must match. yt-dlp needs
  `ffprobe.exe` to read media durations; without it, duration-dependent post-processing
  fails with "ffprobe not found" (`--sponsorblock-remove`, `--force-keyframes-at-cuts`,
  and `--split-chapters` all error out). Any recent win64 build works, e.g.
  https://www.gyan.dev/ffmpeg/builds/ or https://github.com/BtbN/FFmpeg-Builds/releases.
- The installer no longer redistributes ffmpeg, so there's no ffmpeg license text to ship
  with the build — users fetch the binary from upstream themselves.

## aria2c.exe (optional)

- Powers the "Use aria2c downloader" toggle in Settings → Network for faster
  multi-connection downloads. If it's missing, that toggle silently falls back
  to yt-dlp's built-in downloader — nothing breaks.
- Download: https://github.com/aria2/aria2/releases (grab the `aria2-*-win-64bit-build1.zip`,
  copy `aria2c.exe` from it here).
- GPL-2.0 — ship its license text alongside the installer before release if bundled.

> Branding stays generic: AeroFetch is a "yt-dlp frontend." Keep upstream
> license texts with any distributed build.