Filter abitscope
  Convert input audio to audio bit scope video output.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (video)
abitscope AVOptions:
  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 "1024x256")
  s                 <image_size> ..FV..... set video size (default "1024x256")
  colors            <string>     ..FV..... set channels colors (default "red|green|blue|yellow|orange|lime|pink|magenta|brown")


