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           0            ..FV...... draw a point for each sample
     line            1            ..FV...... draw a line for each sample
     p2p             2            ..FV...... draw a line between samples
     cline           3            ..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             0            ..FV...... linear
     log             1            ..FV...... logarithmic
     sqrt            2            ..FV...... square root
     cbrt            3            ..FV...... cubic root
  draw              <int>        ..FV...... set draw mode (from 0 to 1) (default scale)
     scale           0            ..FV...... scale pixel values for each drawn sample
     full            1            ..FV...... draw every pixel for sample directly


