How to convert MP4 video to MP3 audio file

How to convert MP4 video to MP3 audio file for free?
MP4 is a digital multimedia format most commonly used to store video and audio, while MP3 is an audio coding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio streaming or storage, as well as the standard of digital audio compression for the transfer and playback of music on most digital audio players. This simple video tutorial will show you how to convert MP4 video to MP3 audio file. Thanks for watching :)

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