FFmpeg is a free and open source software library and application for use on Android devices. The application provides a command line interface to the library, allowing users to perform conversions on their media easily.

This tool is used to convert media such as audio and video files. It supports many codecs, including lossless ones. It also has a very simple and intuitive user interface, allowing you to perform complex operations without the need for complex instructions.

You can find more information about FFmpeg on the website.