A free app for Android, by inglesdivino.
If you are looking for a tool that you can use to separate the audio from a video clip, then this easy-to-use mobile app will be able to help you. With Extract Audio from Video app, you will be able to extract the sound of a video file in a few simple steps.
The app will allow you to convert several video formats such as MP4, 3GP, WebM and more into MP3 or M4A formats. All you have to do is upload the clip and with few adjustments, you will be able to turn it into an audio file. You will have the option to adjust the volume, trim unwanted parts, or add fade-in and fade-out transitions.