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The first command determined that audio is the required output from the .mp3 extension of the output file. I believe the conversion was a default. If you don't want the defaults you can specify the audio sample rate and the bit rate for the conversion, eg:
FFmpeg -i original.mp4 -ar 48000 -b:a 192k original.mp3
There is (very) comprehensive documentation on the ffmpeg site: ffmpeg Documentation
But if you'd prefer not to wade through all that, if you Google for "ffmpeg" followed by a few words describing what you want to achieve then (as ffmpeg is so widely used) you'll almost certainly find someone has asked (and been answered) before. That was how I learned to use it