Mp3 Media Converter
Media converter allows you to convert your media (videos of flv, 3gp, mp4 and more…) files to mp4 or mp3;
Advanced options supports setting start and end positions, allows you to extract short audio from a movie to create your ring tone.
This app uses LGPL ffmpeg and mp3lame libraries as underlying codecs.
Source: Mp3 Media Converter – Android Apps on Google Play