Marches uses Mediabunny 1.61.3 for browser MP4 output.
Copyright Vanilagy and contributors. Mozilla Public License 2.0.
License: /vendor/mediabunny-LICENSE.txt
Unmodified source for this version:
https://github.com/Vanilagy/mediabunny/tree/v1.61.3
https://registry.npmjs.org/mediabunny/-/mediabunny-1.61.3.tgz

Mediabunny is loaded only for video export. No map data is sent to its authors.