It's very convenient that ffmpeg can also handle audio manipulation too.

Just modify the command below,  We set the volume to 18.64db, so you can adjust to whatever you need.

ffmpeg -i input.mp4 -filter:a "loudnorm=I=-18.64:TP=-1.5:LRA=11" -c:v copy output.mp4

output.mp4 will now be normalized to whatever do you specified above.

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