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How to use sox to compress mp3?

I would like to reduce the file size of some mp3 audio using sox. I think that I can reduce stereo sound by only 1 channel (i.e. Mono), reduce the sampling rate and decrease the bit depth. I believe sox cannot do this. Is this true or did I do it right?

$ sox -r 8000 -c 1 2008-12-28-2.MP3 foo.mp3 sox WARN formats: can't set sample rate 8000; using 44100 sox WARN formats: can't set 1 channels; using 2
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1 answer

Arguments must go before the output file:

 sox 2008-12-28-2.MP3 -r 8000 -c 1 foo.mp3

They can also be represented as effects:

 sox 2008-12-28-2.MP3 foo.mp3 remix 1 rate 8000
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Source: https://habr.com/ru/post/910919/

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