holgersson@posteo.de Nils Freydank Quoting upstream: This program normalizes media files to a certain loudness level using the EBU R128 loudness normalization procedure. It can also perform RMS-based normalization (where the mean is lifted or attenuated), or peak normalization to a certain target level. slhck/ffmpeg-normalize https://github.com/slhck/ffmpeg-normalize/issues