Filter pixscope
  Pixel data analysis.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
pixscope AVOptions:
  x                 <float>      ..FV..... set scope x offset (from 0 to 1) (default 0.5)
  y                 <float>      ..FV..... set scope y offset (from 0 to 1) (default 0.5)
  w                 <int>        ..FV..... set scope width (from 1 to 80) (default 7)
  h                 <int>        ..FV..... set scope height (from 1 to 80) (default 7)
  o                 <float>      ..FV..... set window opacity (from 0 to 1) (default 0.5)
  wx                <float>      ..FV..... set window x offset (from -1 to 1) (default -1)
  wy                <float>      ..FV..... set window y offset (from -1 to 1) (default -1)

This filter has support for timeline through the 'enable' option.

