How to convert from audio online you could try this out: online audio converter far apart best online audio converter free take While you are a regular Mac user, but periodically have to use a PC (or vice versa), you indeed need to get your movie and music be available in a variety of formats. One problem is that how do you get an mp3 sound track when you have a mp4 video in hand? Maybe you just absolutely need to listen to the music on a dedicated music player while on the go, without taking along a big size of video. Or maybe you just want to insert an MP3 file into a project for presentation purpose. Luckily, video converters have been around for several years, allowing users to convert songs from MP4 to MP3 format (Compressed audio file) on Mac/PC and give you the flexibility you need to have your favorite tunes at your fingertips.