ffmpeg for Nebo Media: the GPL source

Nebo Media (a plugin for Nebo) carries its own build of FFmpeg's ffmpeg and ffprobe programs and runs them as separate programs. That build is licensed under the GNU General Public License, version 2 or later (it includes x264, x265, vid.stab and Rubber Band); it contains nothing non-free. This repository is its complete corresponding source. Nebo Media's own code is not part of it.

What is here

Path	What
scripts/build-ffmpeg.sh	Builds ffmpeg and ffprobe for one platform from the pinned upstream sources (scripts/build-ffmpeg.sh <rust-target-triple>)
scripts/check-ffmpeg.sh	Checks a build: GPL v2 or later, never non-free, every component present, links only the operating system
SOURCES.md	Every upstream release tarball the build uses, with its URL and sha256 (all unmodified)
buildinfo/<platform>.txt	Each released platform's exact configure line
LICENSE, LICENSES/	The GPL v2 text and the licences of every library in the build
models/rnnoise-lq.rnnn.gz	The RNNoise model Nebo Media (0.5.2 and later) gives ffmpeg's arnndn filter at run time; see SOURCES.md

Each Nebo Media release has a GitHub release here tagged nebo-media-<version> whose asset nebo-media-ffmpeg-source-<version>.tar.gz holds every upstream tarball, the scripts and the configure lines for that release.

Building it yourself

The scripts build on the platform they target (Windows is cross-built on Linux with mingw-w64). They need a C toolchain, pkg-config, nasm (x86_64), meson, ninja, cmake and autotools. Put the tarballs in build/downloads/ (or let the script download them), then run scripts/build-ffmpeg.sh aarch64-apple-darwin (or another triple listed in the script). The result is written to vendor/<triple>/.

To use your own build with Nebo Media, put ffmpeg and ffprobe in one folder and set NEBO_MEDIA_FFMPEG_DIR to that folder.

The RNNoise model

Since Nebo Media 0.5.2 the build includes FFmpeg's arnndn filter, and Nebo Media passes it the RNNoise model lq.rnnn ("leavened-quisling", from Gregor Richards' rnnoise-models). The model is data read by the filter at run time, not part of the ffmpeg build: Nebo Media embeds it gzip-compressed and writes it beside ffmpeg. models/rnnoise-lq.rnnn.gz is that exact file; SOURCES.md gives its upstream URL and both sha256s. Its README (LICENSES/rnnoise-models-README.txt) states the model is not subject to copyright.

Licence and patents

FFmpeg and the GPL libraries are GPL v2 or later; the other libraries are under the licences in LICENSES/. Patent pools exist for H.264 and HEVC separately from any software licence; AV1 (AOMedia Patent License 1.0) and VP9 are royalty-free.