Licenses & Source

Last updated: July 24, 2026

Mediamorphy runs FFmpeg in your browser. The conversion is performed by @ffmpeg/core v0.12.10 — the single-threaded WebAssembly build of FFmpeg published by the ffmpegwasm project. We serve this binary unmodified from the upstream build. Because the build enables GPL-licensed components (notably x264 and x265), the resulting binary is licensed under the GNU General Public License, version 2 or later (GPL-2.0-or-later).

The binary we serve

Package: @ffmpeg/core version 0.12.10 (single-thread build).
FFmpeg version: n5.1.4.
Build: compiled to WebAssembly with Emscripten by the ffmpegwasm project, with --enable-gpl --enable-libx264 --enable-libx265 --enable-libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libopus --enable-zlib --enable-libwebp --enable-libfreetype --enable-libfribidi --enable-libass --enable-zimg.
Effective license of the combined binary: GPL-2.0-or-later.

Full license texts

The BSD-3-Clause, MIT, ISC, zlib, WTFPL, and FreeType (FTL) licenses that apply to individual components are short permissive licenses; their full texts are included with each component's source (linked below) and are also widely available online.

Corresponding source

In accordance with the GPL, the complete corresponding source used to produce the WebAssembly binary is available here:

Hosted archive: ffmpeg.wasm-core-0.12.10-src.tar.gz (~1.1 MiB) — the ffmpegwasm build project at release tag v0.12.10, including the Dockerfile and build/ scripts that pin FFmpeg n5.1.4 and fetch and compile x264, x265, libvpx, LAME, and the other components listed below.
Upstream repository & exact tag: github.com/ffmpegwasm/ffmpeg.wasm @ v0.12.10 (tag archive: v0.12.10.tar.gz).
Upstream FFmpeg source: FFmpeg n5.1.4 is available from the FFmpeg git repository (tag n5.1.4). The GPL-licensed codec sources used by this build are the ffmpegwasm forks referenced by the build's Dockerfile, e.g. x264 and x265.

Components & their licenses

Component	Role	License
FFmpeg (n5.1.4)	Media framework (GPL-enabled build)	LGPL-2.1+ / GPL-2.0+
x264	H.264 video encoder	GPL-2.0+
x265	H.265/HEVC video encoder	GPL-2.0+
libvpx	VP8/VP9 video codec	BSD-3-Clause
LAME	MP3 audio encoder	LGPL-2.1+
libvorbis	Vorbis audio codec	BSD-3-Clause
libogg	Ogg container	BSD-3-Clause
libtheora	Theora video codec	BSD-3-Clause
Opus	Opus audio codec	BSD-3-Clause
libwebp	WebP image codec	BSD-3-Clause
FreeType	Font rendering	FTL or GPL-2.0
FriBidi	Unicode bidirectional text	LGPL-2.1+
libass	Subtitle rendering	ISC
zimg	Scaling / colorspace	WTFPL
zlib	Compression	zlib
@ffmpeg/ffmpeg, @ffmpeg/util	JavaScript wrapper	MIT

No warranty

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

Trademarks

FFmpeg is a trademark of the FFmpeg project. This site is not affiliated with or endorsed by the FFmpeg or ffmpeg.wasm projects.