利用 ffmpeg 的 maskedmerge 滤镜, 从视频中提取移动对象

ffmpeg    -i background.png    -i video.mkv    -filter_complex    "
      color=#00ff00:size=1280x720 [matte];
      [1:0] format=rgb24, split[mask];
      [0:0][mask] blend=all_mode=difference, 
         curves=m=‘0/0 .1/0 .2/1 1/1‘, 
         format=gray,
         smartblur=1,
         eq=brightness=30:contrast=3, 
         eq=brightness=50:contrast=2, 
         eq=brightness=-10:contrast=50,
         smartblur=3,
         format=rgb24 [mask];
      [matte][mask] maskedmerge,format=rgb24
   "    -shortest    -pix_fmt yuv422p    result.mkv