Open source licences
The converter on this site is FFmpeg. That comes with obligations, and this page meets them.
FFmpeg
This site serves @ffmpeg/core 0.12.10, a WebAssembly build of FFmpeg, from /vendor/ffmpeg/0.12.10/. The build is configured with --enable-gpl and includes GPL-licensed components, so the whole build is distributed under the GNU General Public License version 2 or later.
Source: ffmpeg.org · git.ffmpeg.org · licence text at gnu.org.
ffmpeg.wasm
The JavaScript wrapper that starts the core and talks to it is ffmpeg.wasm, MIT licensed. Copyright © 2019 Jerome Wu and contributors.
Encoders inside this build
| Library | Used for | Licence |
|---|---|---|
| LAME | MP3 encoding | LGPL 2.1+ |
| libvorbis | OGG Vorbis encoding | BSD-3-Clause |
| libopus | Opus decoding (encoding is not offered — see why) | BSD-3-Clause |
| FFmpeg native | AAC, ALAC, FLAC, WMA, PCM, AIFF | LGPL 2.1+ / GPL 2+ |
| zlib | Compression inside containers | zlib |
Everything else
The rest of this site — the page generator, the stylesheet, the converter interface and the decision engine — is written by AppsOverflow LLC and is not open source. It contains no third-party JavaScript at all: no framework, no analytics, no font loader, no CDN.
Source requests
For a copy of the FFmpeg source corresponding to the build served here, write to ceo@appsoverflow.com.