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Dynamic amplification of a sound file
Then I tried ffmpeg's dynaudnorm filter, using various options:
ffmpeg -i needs-levelling.wav -af dynaudnorm tmp.wav
ffmpeg -i needs-levelling.wav -af dynaudnorm=p=0.5 tmp.wav
ffmpeg -i needs-levelling.wav … -af dynaudnorm=r=0.6 tmp.wav
ffmpeg -i needs-levelling.wav -af dynaudnorm=m=50 tmp.wav
ffmpeg -i needs-levelling.wav -af dynaudnorm=m=100 tmp.wav
ffmpeg -i needs-levelling.wav -af dynaudnorm=r=.95 …