Filter showwavespic
  Convert input audio to a video output single picture.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
showwavespic AVOptions:
  size              <image_size> ..FV.... set video size (default "600x240")
  s                 <image_size> ..FV.... set video size (default "600x240")
  split_channels    <boolean>    ..FV.... draw channels separately (default false)
  colors            <string>     ..FV.... set channels colors (default "red|green|blue|yellow|orange|lime|pink|magenta|brown")
  scale             <int>        ..FV.... set amplitude scale (from 0 to 3) (default lin)
     lin                          ..FV.... linear
     log                          ..FV.... logarithmic
     sqrt                         ..FV.... square root
     cbrt                         ..FV.... cubic root


