Filter hilbert
  Generate a Hilbert transform FIR coefficients.
    Inputs:
        none (source filter)
    Outputs:
       #0: default (audio)
hilbert AVOptions:
  sample_rate       <int>        ..F.A... set sample rate (from 1 to INT_MAX) (default 44100)
  r                 <int>        ..F.A... set sample rate (from 1 to INT_MAX) (default 44100)
  taps              <int>        ..F.A... set number of taps (from 11 to 65535) (default 22051)
  t                 <int>        ..F.A... set number of taps (from 11 to 65535) (default 22051)
  nb_samples        <int>        ..F.A... set the number of samples per requested frame (from 1 to INT_MAX) (default 1024)
  n                 <int>        ..F.A... set the number of samples per requested frame (from 1 to INT_MAX) (default 1024)
  win_func          <int>        ..F.A... set window function (from 0 to 18) (default blackman)
     rect                         ..F.A... Rectangular
     bartlett                     ..F.A... Bartlett
     hanning                      ..F.A... Hanning
     hamming                      ..F.A... Hamming
     blackman                     ..F.A... Blackman
     welch                        ..F.A... Welch
     flattop                      ..F.A... Flat-top
     bharris                      ..F.A... Blackman-Harris
     bnuttall                     ..F.A... Blackman-Nuttall
     bhann                        ..F.A... Bartlett-Hann
     sine                         ..F.A... Sine
     nuttall                      ..F.A... Nuttall
     lanczos                      ..F.A... Lanczos
     gauss                        ..F.A... Gauss
     tukey                        ..F.A... Tukey
     dolph                        ..F.A... Dolph-Chebyshev
     cauchy                       ..F.A... Cauchy
     parzen                       ..F.A... Parzen
     poisson                      ..F.A... Poisson
  w                 <int>        ..F.A... set window function (from 0 to 18) (default blackman)
     rect                         ..F.A... Rectangular
     bartlett                     ..F.A... Bartlett
     hanning                      ..F.A... Hanning
     hamming                      ..F.A... Hamming
     blackman                     ..F.A... Blackman
     welch                        ..F.A... Welch
     flattop                      ..F.A... Flat-top
     bharris                      ..F.A... Blackman-Harris
     bnuttall                     ..F.A... Blackman-Nuttall
     bhann                        ..F.A... Bartlett-Hann
     sine                         ..F.A... Sine
     nuttall                      ..F.A... Nuttall
     lanczos                      ..F.A... Lanczos
     gauss                        ..F.A... Gauss
     tukey                        ..F.A... Tukey
     dolph                        ..F.A... Dolph-Chebyshev
     cauchy                       ..F.A... Cauchy
     parzen                       ..F.A... Parzen
     poisson                      ..F.A... Poisson


