Filter afftdn
  Denoise audio samples using FFT.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
afftdn AVOptions:
  nr                <float>      ..F.A.... set the noise reduction (from 0.01 to 97) (default 12)
  nf                <float>      ..F.A.... set the noise floor (from -80 to -20) (default -50)
  nt                <int>        ..F.A.... set the noise type (from 0 to 3) (default w)
     w               0            ..F.A.... white noise
     v               1            ..F.A.... vinyl noise
     s               2            ..F.A.... shellac noise
     c               3            ..F.A.... custom noise
  bn                <string>     ..F.A.... set the custom bands noise
  rf                <float>      ..F.A.... set the residual floor (from -80 to -20) (default -38)
  tn                <boolean>    ..F.A.... track noise (default false)
  tr                <boolean>    ..F.A.... track residual (default false)
  om                <int>        ..F.A.... set output mode (from 0 to 2) (default o)
     i               0            ..F.A.... input
     o               1            ..F.A.... output
     n               2            ..F.A.... noise

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

