Audio software credits
M4A export uses Mediabunny and its AAC encoder extension, version 1.56.2. Copyright 2026 Vanilagy and contributors. Both packages use the Mozilla Public License 2.0. The local AAC bundle changes only its dependency import to the adjacent Mediabunny file.
Mediabunny source · MPL 2.0 license
The AAC extension includes a WebAssembly build of FFmpeg's AAC encoder. FFmpeg is licensed under the GNU Lesser General Public License, version 2.1 or later. Its source and rebuild instructions are available below. The encoder loads only when the browser lacks native AAC encoding.
FFmpeg source · LGPL 2.1 license · Encoder build instructions