Filter overlay_qsv
  Quick Sync Video overlay.
    Inputs:
       #0: main (video)
       #1: overlay (video)
    Outputs:
       #0: default (video)
overlay_qsv AVOptions:
  x                 <string>     ..FV..... Overlay x position (default "0")
  y                 <string>     ..FV..... Overlay y position (default "0")
  w                 <string>     ..FV..... Overlay width (default "overlay_iw")
  h                 <string>     ..FV..... Overlay height (default "overlay_ih*w/overlay_iw")
  alpha             <int>        ..FV..... Overlay global alpha (from 0 to 255) (default 255)
  eof_action        <int>        ..FV..... Action to take when encountering EOF from secondary input  (from 0 to 2) (default repeat)
     repeat                       ..FV..... Repeat the previous frame.
     endall                       ..FV..... End both streams.
     pass                         ..FV..... Pass through the main input.
  shortest          <boolean>    ..FV..... force termination when the shortest input terminates (default false)
  repeatlast        <boolean>    ..FV..... repeat overlay of the last overlay frame (default true)

framesync AVOptions:
  eof_action        <int>        ..FV..... Action to take when encountering EOF from secondary input  (from 0 to 2) (default repeat)
     repeat                       ..FV..... Repeat the previous frame.
     endall                       ..FV..... End both streams.
     pass                         ..FV..... Pass through the main input.
  shortest          <boolean>    ..FV..... force termination when the shortest input terminates (default false)
  repeatlast        <boolean>    ..FV..... extend last frame of secondary streams beyond EOF (default true)


