Normalizing audio with Python

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From here:

from pydub import AudioSegment, effects

rawsound = AudioSegment.from_file("./input.m4a", "m4a")
normalizedsound = effects.normalize(rawsound)
normalizedsound.export("./output.wav", format="wav")

Note that the above example outputs a WAV file. To output M4A, use format="mp4".