Muting a video only silences playback — the audio data is still embedded in the video file, and the file size stays large. When you Extract Audio From Video, it actually pulls the sound out into a separate, much smaller MP3 file you can use independently of the video.
Extract Audio From Video

Extract Audio From Video

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Extract Audio From Video: Only Need the Sound, Not the File? You’ve got a video, but all you actually want […]