Filter tile
  Tile several successive frames together.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
tile AVOptions:
  layout            <image_size> ..FV..... set grid size (default "6x5")
  nb_frames         <int>        ..FV..... set maximum number of frame to render (from 0 to INT_MAX) (default 0)
  margin            <int>        ..FV..... set outer border margin in pixels (from 0 to 1024) (default 0)
  padding           <int>        ..FV..... set inner border thickness in pixels (from 0 to 1024) (default 0)
  color             <color>      ..FV..... set the color of the unused area (default "black")
  overlap           <int>        ..FV..... set how many frames to overlap for each render (from 0 to INT_MAX) (default 0)
  init_padding      <int>        ..FV.....  set how many frames to initially pad (from 0 to INT_MAX) (default 0)


