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FFMPeg Normalize Audio mp3

We can use this command to find the max volume: ffmpeg -i sound.mp3 -af volumedetect -f null -y nul &> original.txt It will return something like [Parsed_volumedetect_0 @ 0x7fa4f7d00000] n_samples: 4997376 [Parsed_volumedetect_0 @ 0x7fa4f7d00000] mean_volume: -27.6 dB [Parsed_volumedetect_0 @ 0x7fa4f7d00000] max_volume: -12.3 dB [Parsed_volumedetect_0 @ 0x7fa4f7d00000] histogram_12db: 663 [Parsed_volumedetect_0 @ 0x7fa4f7d00000] histogram_13db: 1846 [Parsed_volumedetect_0 @ […]