Filter bandreject
  Apply a two-pole Butterworth band-reject filter.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
bandreject AVOptions:
  frequency         <double>     ..F.A....T set central frequency (from 0 to 999999) (default 3000)
  f                 <double>     ..F.A....T set central frequency (from 0 to 999999) (default 3000)
  width_type        <int>        ..F.A....T set filter-width type (from 1 to 5) (default q)
     h               1            ..F.A....T Hz
     q               3            ..F.A....T Q-Factor
     o               2            ..F.A....T octave
     s               4            ..F.A....T slope
     k               5            ..F.A....T kHz
  t                 <int>        ..F.A....T set filter-width type (from 1 to 5) (default q)
     h               1            ..F.A....T Hz
     q               3            ..F.A....T Q-Factor
     o               2            ..F.A....T octave
     s               4            ..F.A....T slope
     k               5            ..F.A....T kHz
  width             <double>     ..F.A....T set band-width (from 0 to 99999) (default 0.5)
  w                 <double>     ..F.A....T set band-width (from 0 to 99999) (default 0.5)
  mix               <double>     ..F.A....T set mix (from 0 to 1) (default 1)
  m                 <double>     ..F.A....T set mix (from 0 to 1) (default 1)
  channels          <channel_layout> ..F.A....T set channels to filter (default 0xffffffffffffffff)
  c                 <channel_layout> ..F.A....T set channels to filter (default 0xffffffffffffffff)
  normalize         <boolean>    ..F.A....T normalize coefficients (default false)
  n                 <boolean>    ..F.A....T normalize coefficients (default false)
  transform         <int>        ..F.A..... set transform type (from 0 to 3) (default di)
     di              0            ..F.A..... direct form I
     dii             1            ..F.A..... direct form II
     tdii            2            ..F.A..... transposed direct form II
     latt            3            ..F.A..... lattice-ladder form
  a                 <int>        ..F.A..... set transform type (from 0 to 3) (default di)
     di              0            ..F.A..... direct form I
     dii             1            ..F.A..... direct form II
     tdii            2            ..F.A..... transposed direct form II
     latt            3            ..F.A..... lattice-ladder form

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

