loudnorm

EBU R128 loudness normalization. Includes both dynamic and linear normalization modes. Support for both single pass (livestreams, files) and double pass (files) modes. This algorithm can target IL, LRA, and maximum true peak. To accurately detect true peaks, the audio stream will be upsampled to 192 kHz unless the normalization mode is linear. Use the -ar option or aresample filter to explicitly set an output sample rate.

The filter accepts the following options:

'I, i'

Set integrated loudness target. Range is -70.0 - -5.0. Default value is -24.0.

'LRA, lra'

Set loudness range target. Range is 1.0 - 20.0. Default value is 7.0.

'TP, tp'

Set maximum true peak. Range is -9.0 - +0.0. Default value is -2.0.

'measured_I, measured_i'

Measured IL of input file. Range is -99.0 - +0.0.

'measured_LRA, measured_lra'

Measured LRA of input file. Range is 0.0 - 99.0.

'measured_TP, measured_tp'

Measured true peak of input file. Range is -99.0 - +99.0.

'measured_thresh'

Measured threshold of input file. Range is -99.0 - +0.0.

'offset'

Set offset gain. Gain is applied before the true-peak limiter. Range is -99.0 - +99.0. Default is +0.0.

'linear'

Normalize linearly if possible. measured_I, measured_LRA, measured_TP, and measured_thresh must also to be specified in order to use this mode. Options are true or false. Default is true.

'dual_mono'

Treat mono input files as "dual-mono". If a mono file is intended for playback on a stereo system, its EBU R128 measurement will be perceptually incorrect. If set to true, this option will compensate for this effect. Multi-channel input files are not affected by this option. Options are true or false. Default is false.

'print_format'

Set print format for stats. Options are summary, json, or none. Default value is none.