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            0            ..FV...... Rectangular
     bartlett        4            ..FV...... Bartlett
     hann            1            ..FV...... Hann
     hanning         1            ..FV...... Hanning
     hamming         2            ..FV...... Hamming
     blackman        3            ..FV...... Blackman
     welch           5            ..FV...... Welch
     flattop         6            ..FV...... Flat-top
     bharris         7            ..FV...... Blackman-Harris
     bnuttall        8            ..FV...... Blackman-Nuttall
     bhann           11           ..FV...... Bartlett-Hann
     sine            9            ..FV...... Sine
     nuttall         10           ..FV...... Nuttall
     lanczos         12           ..FV...... Lanczos
     gauss           13           ..FV...... Gauss
     tukey           14           ..FV...... Tukey
     dolph           15           ..FV...... Dolph-Chebyshev
     cauchy          16           ..FV...... Cauchy
     parzen          17           ..FV...... Parzen
     poisson         18           ..FV...... Poisson
     bohman          19           ..FV...... Bohman
  overlap           <float>      ..FV...... set window overlap (from 0 to 1) (default 0.5)


