Filter adenorm
  Remedy denormals by adding extremely low-level noise.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
adenorm AVOptions:
  level             <double>     ..F.A....T set level (from -451 to -90) (default -351)
  type              <int>        ..F.A....T set type (from 0 to 3) (default dc)
     dc              0            ..F.A....T
     ac              1            ..F.A....T
     square          2            ..F.A....T
     pulse           3            ..F.A....T

This filter has support for timeline through the 'enable' option.

