Install bs1770gain by entering the following commands in the terminal:
sudo apt update sudo apt install bs1770gain
measure and adjust audio and video sound loudness
The command line tool bs1770gain is a loudness scanner compliant with ITU-R BS.1770 and its flavors EBU R128, ATSC A/85, and ReplayGain 2.0. It helps normalizing the loudness of audio and video files to the same level.