A free program for Android, by Power Video Player.

Video to MP3 Converter, MP3 Cutter & Video Cutter is an application that can extract audio from video or convert it to audio. This app is very easy to use, so it is very suitable for most people.

It is very simple and fast, so you can do everything you need to in a short time. You can choose between the mp3 and wav file format.

One of the best features of this app is that whenever you cut a clip, you will be able to keep the original quality.