Here it is: https://gist.github.com/Yamakaky/0f0546ea0aeb4ed220caa82d814b7d68.
This will create the REPLAYGAIN_TRACK_PEAK and GAIN (-a is not implemented). It
should support any codec supported by ffmpeg. It must be run one time ahead of
time.
In liquidsoap, a basic support is to use `amplify(1.0, override =
"REPLAYGAIN_TRACK_PEAK", source)`. It however doesn't support pre-amp or
clipping.
BTW, do you know why
https://wiki.hydrogenaud.io/index.php?title=ReplayGain_specification#Reduced_gain
uses a factor of 20? I thought 3dB = x2 amp, but with this formula it's more
around 7dB.
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