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                         ..FV.... show lines
     bar                          ..FV.... show bars
     dot                          ..FV.... show dots
  ascale            <int>        ..FV.... set amplitude scale (from 0 to 3) (default log)
     lin                          ..FV.... linear
     sqrt                         ..FV.... square root
     cbrt                         ..FV.... cubic root
     log                          ..FV.... logarithmic
  fscale            <int>        ..FV.... set frequency scale (from 0 to 2) (default lin)
     lin                          ..FV.... linear
     log                          ..FV.... logarithmic
     rlog                         ..FV.... reverse logarithmic
  win_size          <int>        ..FV.... set window size (from 4 to 16) (default w2048)
     w16                          ..FV....
     w32                          ..FV....
     w64                          ..FV....
     w128                         ..FV....
     w256                         ..FV....
     w512                         ..FV....
     w1024                        ..FV....
     w2048                        ..FV....
     w4096                        ..FV....
     w8192                        ..FV....
     w16384                       ..FV....
     w32768                       ..FV....
     w65536                       ..FV....
  win_func          <int>        ..FV.... set window function (from 0 to 18) (default hanning)
     rect                         ..FV.... Rectangular
     bartlett                     ..FV.... Bartlett
     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
  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                     ..FV.... show all channels in same window
     separate                     ..FV.... show each channel in own window
  minamp            <float>      ..FV.... set minimum amplitude (from FLT_MIN to 1e-006) (default 1e-006)


