A free program for Android, by iVoice Translate.

Fast Video to MP3 Converter is a free, versatile, and user-friendly tool for converting video and audio from one format to another. The app is designed to work offline and does not require an Internet connection to convert your files. You can use it on your mobile devices, such as Android phones, tablets, and other mobile devices.

You can choose from a variety of video and audio formats. In addition, you can specify the size of the output file, the quality level, and the number of files to convert. The app supports a wide range of formats, including MP4, MOV, MP3, WAV, AIFF, OGG, FLAC, and more. You can even convert to a different audio format, such as MP2, MP3, OGG, etc.

The app has a built-in audio extractor that lets you extract audio from your videos and a video trimmer that lets you trim your videos. You can specify the length of the output file and the quality level.