If you tend to extract the audio track of an MP4 video to save the storage space of your device, you could choose M4A format. It is a filename extension of audio-only MPEG-4 files. An interesting fact is that MP4 stands for MPEG-4 Part 14. So to tell the truth, M4A and MP4 have something in common. Therefore, if you choose the right video converter, it will be not difficult to convert MP4 to M4A. In the following parts, we will show you 3 online and offline amazing video to audio converters for both Windows and Mac. Later, we will discuss whether it is really practical to change MP4 to M4A by changing the filename extension directly.