Filter showwaves
  Convert input audio to a video output.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
showwaves AVOptions:
  size              <image_size> ..FV.... set video size (default "600x240")
  s                 <image_size> ..FV.... set video size (default "600x240")
  mode              <int>        ..FV.... select display mode (from 0 to 3) (default point)
     point                        ..FV.... draw a point for each sample
     line                         ..FV.... draw a line for each sample
     p2p                          ..FV.... draw a line between samples
     cline                        ..FV.... draw a centered line for each sample
  n                 <int>        ..FV.... set how many samples to show in the same point (from 0 to INT_MAX) (default 0)
  rate              <video_rate> ..FV.... set video rate (default "25")
  r                 <video_rate> ..FV.... set video rate (default "25")
  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


