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I'm looking at a way to ensure an audio file doesn't ever get too loud, but I do not want to change the samples if it is under a given threshold.

For example, I would like the file to have a maximum of -24dB. Anything in the file which is between -70dB and -24dB should not be changed.

Is there a way to accomplish this using the loudnorm extension of ffmpeg?

The following works if the input is over -24dB, but when it is under, it will increase the volume:

ffmpeg -i input.mp3 -vn -af loudnorm=I=-24 -ar 44.1k output.mp3

I'd like a way to decrease the volume only in areas where the input file is too loud.

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    Sounds like you want alimiter. See ffmpeg.org/ffmpeg-filters.html#alimiter
    – Gyan
    Commented Dec 4, 2021 at 4:44
  • @Gyan, I'll have to test that... Only I don't really see a way to specify the threshold in dB. Commented Dec 4, 2021 at 7:54
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    Add dB suffix e.g. limit=-30dB
    – Gyan
    Commented Dec 4, 2021 at 7:56

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