You can extract the sounds of your videos in two formats: MP3 or M4A.
It's like converting your video files into audio files.
The extracted audio can be edited, either by adjusting its volume or by trimming unwanted regions. You can also add a fade-in and a fade-out so that the audio does not start or end abruptly.
It supports several video formats (mp4, 3gp, webm,...)