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You should also use an option such as -c:a copy before the output file is specified so that ffmpeg copies the stream rather than re-encoding it, otherwise you lose quality.
– realgeek
Commented Jul 7, 2016 at 15:09
This shrunk all my mp3s to 3 seconds.... ffmpeg gave an error "[mp3 @ 0x7f975a800000] Estimating duration from bitrate, this may be inaccurate"
– Alec Jacobson
Commented Oct 26, 2020 at 13:07

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create code fences with backticks ` or tildes ~
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like so
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```
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