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 16 to 65536) (default 2048)
  win_func          <int>        ..FV..... set window function (from 0 to 19) (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
     bohman                       ..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                     ..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)


