Filter maskedmin
  Apply filtering with minimum difference of two streams.
    slice threading supported
    Inputs:
       #0: source (video)
       #1: filter1 (video)
       #2: filter2 (video)
    Outputs:
       #0: default (video)
maskedmin AVOptions:
  planes            <int>        ..FV...... set planes (from 0 to 15) (default 15)

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

