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I need to convert some CD mastered audio to be sent to Spotify.

Spotify does not prefer CD mastered but it has some loudness suggestions:

( https://artists.spotify.com/en/help/article/loudness-normalization )

    Target the loudness level of your master at -14dB integrated LUFS 
and keep it below -1dB TP (True Peak) max. This is best for lossy 
formats (Ogg/Vorbis and AAC) and makes sure no extra distortion’s 
introduced in the transcoding process.

    If your master’s louder than -14dB integrated LUFS, make sure 
it stays below -2dB TP (True Peak) to avoid extra distortion. This 
is because louder tracks are more susceptible to extra distortion 
in the transcoding process.

Is this doable with ffmpeg? Any other program?

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For sure it can!

You can do this with the loudnorm filter:

ffmpeg -i input.mp3 -af loudnorm=I=-14:LRA=11:TP=-1 output.mp3

I = integrated loudness

LRA = loudness range

TP = true peak

It seems that you can get better results by running a second pass. You can do it manually like mentioned here or by using ffmpeg-normalize, which can do it in one go.

Example with same parameters:

ffmpeg-normalize input.flac -t -14 -lrt 11 -tp -1 output.flac

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  • wow, I'm totally speachless. ffmpeg ftw!
    – Antti Rytsölä
    Commented Feb 18, 2022 at 20:05
  • 1
    @AnttiRytsölä truly one software to rule them all
    – mashuptwice
    Commented Feb 18, 2022 at 20:08
  • Current (04/2022) command line is ffmpeg-normalize input.flac -t -14 -lrt 11 -tp -1 -ext flac -c:a flac -o output.flac
    – Antti Rytsölä
    Commented Apr 17, 2022 at 8:50

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