in MP3 metadata (using mp3info or ffprobe ):

This encoding method adjusts the amount of data (bitrate) used per second based on the complexity of the music.

Jaanemann — 2006mp3vbr320kbps Vmr

in MP3 metadata (using mp3info or ffprobe ):

This encoding method adjusts the amount of data (bitrate) used per second based on the complexity of the music.