Filter showspatial
  Convert input audio to a spatial video output.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
showspatial AVOptions:
  size              <image_size> ..FV..... set video size (default "512x512")
  s                 <image_size> ..FV..... set video size (default "512x512")
  win_size          <int>        ..FV..... set window size (from 1024 to 65536) (default 4096)
  win_func          <int>        ..FV..... set window function (from 0 to 19) (default hann)
     rect                         ..FV..... Rectangular
     bartlett                     ..FV..... Bartlett
     hann                         ..FV..... Hann
     hanning                      ..FV..... Hanning
     hamming                      ..FV..... Hamming
     blackman                     ..FV..... Blackman
     welch                        ..FV..... Welch
     flattop                      ..FV..... Flat-top
     bharris                      ..FV..... Blackman-Harris
     bnuttall                     ..FV..... Blackman-Nuttall
     bhann                        ..FV..... Bartlett-Hann
     sine                         ..FV..... Sine
     nuttall                      ..FV..... Nuttall
     lanczos                      ..FV..... Lanczos
     gauss                        ..FV..... Gauss
     tukey                        ..FV..... Tukey
     dolph                        ..FV..... Dolph-Chebyshev
     cauchy                       ..FV..... Cauchy
     parzen                       ..FV..... Parzen
     poisson                      ..FV..... Poisson
     bohman                       ..FV..... Bohman
  overlap           <float>      ..FV..... set window overlap (from 0 to 1) (default 0.5)


