Filter maskedthreshold
  Pick pixels comparing absolute difference of two streams with threshold.
    slice threading supported
    Inputs:
       #0: source (video)
       #1: reference (video)
    Outputs:
       #0: default (video)
maskedthreshold AVOptions:
  threshold         <int>        ..FV...... set threshold (from 0 to 65535) (default 1)
  planes            <int>        ..FV...... set planes (from 0 to 15) (default 15)

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

