Loudness measurement according to EBU-R128https://kokkinizita.linuxaudio.org/linuxaudio/ebumeter-doc/quickguide.html
Ebumeter provides real-time level metering according to the EBU R-128
recommendation. The current release implements all features required
by the EBU document except the oversampled peak level monitoring.
ebumeter can only be used with JACK.
A separate command-line utility (ebur128) to measure audio files is
provided as well.