Filter showfreqs
  Convert input audio to a frequencies video output.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
showfreqs AVOptions:
  size              <image_size> ..FV...... set video size (default "1024x512")
  s                 <image_size> ..FV...... set video size (default "1024x512")
  mode              <int>        ..FV...... set display mode (from 0 to 2) (default bar)
     line            0            ..FV...... show lines
     bar             1            ..FV...... show bars
     dot             2            ..FV...... show dots
  ascale            <int>        ..FV...... set amplitude scale (from 0 to 3) (default log)
     lin             0            ..FV...... linear
     sqrt            1            ..FV...... square root
     cbrt            2            ..FV...... cubic root
     log             3            ..FV...... logarithmic
  fscale            <int>        ..FV...... set frequency scale (from 0 to 2) (default lin)
     lin             0            ..FV...... linear
     log             1            ..FV...... logarithmic
     rlog            2            ..FV...... reverse logarithmic
  win_size          <int>        ..FV...... set window size (from 16 to 65536) (default 2048)
  win_func          <int>        ..FV...... set window function (from 0 to 19) (default hanning)
     rect            0            ..FV...... Rectangular
     bartlett        4            ..FV...... Bartlett
     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 1)
  averaging         <int>        ..FV...... set time averaging (from 0 to INT_MAX) (default 1)
  colors            <string>     ..FV...... set channels colors (default "red|green|blue|yellow|orange|lime|pink|magenta|brown")
  cmode             <int>        ..FV...... set channel mode (from 0 to 1) (default combined)
     combined        0            ..FV...... show all channels in same window
     separate        1            ..FV...... show each channel in own window
  minamp            <float>      ..FV...... set minimum amplitude (from FLT_MIN to 1e-06) (default 1e-06)
  data              <int>        ..FV...... set data mode (from 0 to 2) (default magnitude)
     magnitude       0            ..FV...... show magnitude
     phase           1            ..FV...... show phase
     delay           2            ..FV...... show group delay


