Filter interleave
  Temporally interleave video inputs.
    Inputs:
        dynamic (depending on the options)
    Outputs:
       #0: default (video)
interleave AVOptions:
  nb_inputs         <int>        ..FV...... set number of inputs (from 1 to INT_MAX) (default 2)
  n                 <int>        ..FV...... set number of inputs (from 1 to INT_MAX) (default 2)
  duration          <int>        ..FV...... how to determine the end-of-stream (from 0 to 2) (default longest)
     longest         0            ..FV...... Duration of longest input
     shortest        1            ..FV...... Duration of shortest input
     first           2            ..FV...... Duration of first input


