A free app for Android, by iApp Inc..

Video to MP3 Converter is an easy-to-use app to convert video to audio. You can choose between many video formats like MP4, AVI, MOV, MKV, etc. And you can also convert your audio files from MP3, AAC, AC3, WAV, FLAC, etc. 

To use this app, you have to first select your video file from your device’s library or from your camera roll. Next, you need to select the time range of the video you want to cut. You can choose from the beginning, middle, or end of the video. You can also choose the audio file format like MP3, AAC, AC3, WAV, etc. After that, you can choose the size of the output audio file. After clicking “Start,” the conversion will begin. You can watch the progress of the conversion in the progress bar. When the conversion is complete, you will be notified. You can also save the output audio file in your device’s folder.