# FFmpeg Notice

Absolute Utilities & Tools (AUT) bundles **FFmpeg** to provide media inspection,
transcoding and audio extraction. FFmpeg is a separate program: AUT runs
`ffmpeg.exe` / `ffprobe.exe` as child processes and is not linked against
any FFmpeg library.

## Licence

This copy of FFmpeg is an **LGPL-only build**, licensed under the
**GNU Lesser General Public License, version 3** (it was configured with
`--enable-version3` and **without** `--enable-gpl` or `--enable-nonfree`).
The full licence text is in `FFmpeg-LGPL-3.0.txt` next to this file.

The FFmpeg libraries are shipped as separate DLLs (`avcodec-63.dll`,
`avformat-63.dll`, ...). You may replace them, or the whole FFmpeg folder,
with your own compatible build; AUT locates `ffmpeg.exe` in its
`resources\bin` folder at run time.

## Source code

| Item | Value |
| :--- | :--- |
| FFmpeg version | `n9.0.2-28-g669f5ab083` (built 2026-10-17) |
| FFmpeg source | https://github.com/FFmpeg/FFmpeg/tree/669f5ab083 |
| Build recipe | https://github.com/BtbN/FFmpeg-Builds (tag `autobuild-2026-10-17-20-51`, variant `win64-lgpl-shared-9.0`) |
| Binary archive | `ffmpeg-n9.0.2-28-g669f5ab083-win64-lgpl-shared-9.0.zip` |
| Archive SHA-256 | `00ab3bc8fe02554bd0fffac9968bba498d1ab7e899a4871b85fbba828a50bfcc` |

Absolute Autonomy (Pty) Ltd will also provide the corresponding source code
on request for at least three years from the date of distribution.

External libraries compiled into this build are themselves under
LGPL-compatible licences (BSD, MIT, ISC, Apache-2.0, LGPL, zlib and similar),
including: aom, dav1d, kvazaar, mp3lame, openh264, opus, rav1e, SVT-AV1,
theora, vorbis, vpx, webp, zimg.

## Bundled file manifest

`scripts/fetch-ffmpeg.ps1` checks every provisioned file against this table.

| File | SHA-256 |
| :--- | :--- |
| `avcodec-63.dll` | `2af9e8446207c81776c931bb25d601239b1640c904e5ac39b60ac6f6e77d104b` |
| `avdevice-63.dll` | `dcb3ea632e621a9c5a885e822c6cb691c0fd7fe27680291f0bdf372af482752c` |
| `avfilter-12.dll` | `eacd7654624215009240a30b93f191a1b2675d9160a7ddd63cd9f999c84410ca` |
| `avformat-63.dll` | `653e7419590f97142df2e3db5da73684d45b71d01a3b7f22045db501947beb86` |
| `avutil-61.dll` | `22f2df521436d62eca15ed1796b4813a0c1cd6eac0ec6fc6d9f2fdd7d3cdb2d2` |
| `ffmpeg.exe` | `95222b4af4a40c72bac5424eb7d89114585aef3fddf1845582419fd4e66eea9d` |
| `ffprobe.exe` | `e3fab05b99e8a81eb7c3d5418f6eacf515bf48fa99664bf2c9043fc45bc034e0` |
| `swresample-7.dll` | `8ca4e583d6f0a9490774f122f71127d97020c81bbe7e9495e99154ee6ed421a7` |
| `swscale-10.dll` | `f92b017fbaea4b14ff98ce8d8d03e9c2bb2ea3a93917a90771677a1ee90008e8` |

## Codec patents

Software licences do not grant patent rights. Distributing H.264 / H.265
encoders (OpenH264, Kvazaar) commercially may require patent licences from
the relevant pools; review this before general release.