Display time domain statistical information about the audio channels. Statistics are calculated and displayed for each audio channel and, where applicable, an overall figure is also given.

The filter accepts the following option:

length

Short window length in seconds, used for peak and trough RMS measurement. Default is 0.05 (50 miliseconds). Allowed range is [0.1 - 10].

A description of each shown parameter follows:

DC offset

Mean amplitude displacement from zero.

Min level

Minimal sample level.

Max level

Maximal sample level.

Peak level dB, RMS level dB

Standard peak and RMS level measured in dBFS.

RMS peak dB, RMS trough dB

Peak and trough values for RMS level measured over a short window.

Crest factor

Standard ratio of peak to RMS level (note: not in dB).

Flat factor

Flatness (i.e. consecutive samples with the same value) of the signal at its peak levels (i.e. either Min level or Max level).

Peak count

Number of occasions (not the number of samples) that the signal attained either Min level or Max level.