Licenses and notices
Original Convert by Ben Morin application code is made available under the MIT License.
The conversion engine is separate: the JavaScript FFmpeg interface uses MIT, while the WebAssembly @ffmpeg/core package declares GPL-2.0-or-later. The application license does not change the engine license.
An MIT license for the original application is not a claim that the complete, deployed app is MIT-only. Hosting the GPL engine entails its separate distribution obligations.