Filter avectorscope
  Convert input audio to vectorscope video output.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
avectorscope AVOptions:
  mode              <int>        ..FV..... set mode (from 0 to 2) (default lissajous)
     lissajous       0            ..FV..... 
     lissajous_xy    1            ..FV..... 
     polar           2            ..FV..... 
  m                 <int>        ..FV..... set mode (from 0 to 2) (default lissajous)
     lissajous       0            ..FV..... 
     lissajous_xy    1            ..FV..... 
     polar           2            ..FV..... 
  rate              <video_rate> ..FV..... set video rate (default "25")
  r                 <video_rate> ..FV..... set video rate (default "25")
  size              <image_size> ..FV..... set video size (default "400x400")
  s                 <image_size> ..FV..... set video size (default "400x400")
  rc                <int>        ..FV..... set red contrast (from 0 to 255) (default 40)
  gc                <int>        ..FV..... set green contrast (from 0 to 255) (default 160)
  bc                <int>        ..FV..... set blue contrast (from 0 to 255) (default 80)
  ac                <int>        ..FV..... set alpha contrast (from 0 to 255) (default 255)
  rf                <int>        ..FV..... set red fade (from 0 to 255) (default 15)
  gf                <int>        ..FV..... set green fade (from 0 to 255) (default 10)
  bf                <int>        ..FV..... set blue fade (from 0 to 255) (default 5)
  af                <int>        ..FV..... set alpha fade (from 0 to 255) (default 5)
  zoom              <double>     ..FV..... set zoom factor (from 0 to 10) (default 1)
  draw              <int>        ..FV..... set draw mode (from 0 to 1) (default dot)
     dot             0            ..FV..... 
     line            1            ..FV..... 
  scale             <int>        ..FV..... set amplitude scale mode (from 0 to 3) (default lin)
     lin             0            ..FV..... linear
     sqrt            1            ..FV..... square root
     cbrt            2            ..FV..... cube root
     log             3            ..FV..... logarithmic
  swap              <boolean>    ..FV..... swap x axis with y axis (default true)
  mirror            <int>        ..FV..... mirror axis (from 0 to 3) (default none)
     none            0            ..FV..... no mirror
     x               1            ..FV..... mirror x
     y               2            ..FV..... mirror y
     xy              3            ..FV..... mirror both


