adrc

Apply spectral dynamic range controller filter to input audio stream.

A description of the accepted options follows.

transfer

Set the transfer expression.

The expression can contain the following constants:

ch

current channel number

sn

current sample number

nb_channels

number of channels

t

timestamp expressed in seconds

sr

sample rate

p

current frequency power value, in dB

f

current frequency in Hz

Default value is p.

attack

Set the attack in milliseconds. Default is 50 milliseconds. Allowed range is from 1 to 1000 milliseconds.

release

Set the release in milliseconds. Default is 100 milliseconds. Allowed range is from 5 to 2000 milliseconds.

channels

Set which channels to filter, by default all channels in audio stream are filtered.