This is a free app to convert videos to mp3, supported formats include mp4, mpeg, vob, and many other less known formats. The app has an easy to use interface, you can convert videos in just two or three clicks. Advanced settings are supported, you can change the bitrate and the target directory.

There are two ways to use the app:

The first way is to select a video file from the device's gallery. After that, you need to select the desired settings and click on the 'Convert' button. You can see the progress of your conversion in the notification area.