FFmpeg 6.0.1
Since* 4.4
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Remedy denormals in audio by adding extremely low-level noise.

This filter shall be placed before any filter that can produce denormals.

A description of the accepted parameters follows.

level

Set level of added noise in dB. Default is -351. Allowed range is from -451 to -90.

type

Set type of added noise.

dc

Add DC signal.

ac

Add AC signal.

square

Add square signal.

pulse

Add pulse signal.

Default is dc.

#

Commands

This filter supports the all above options as commands.