Convert MP4 to MP3 is a free application to extract audio file from MP4 video. This utility can extract the audio data from your MP4/MPEG4 video files and convert to the most popular audio format MP3. It also produces good quality MP3 files from MP4 videos. Apart from MP4, the application also supports extracting audio from AVI, DivX, Xvid, FLV (Flash Video), Quicktime Video (.mov), DVD video, VOB video and converting it to MP3 format.