gen7

gistfile1.txt

$('gen7')
  .iter(101,()=>{
  this.silence(100000)
  .rect2d(0, 0, 1000, 100, 1, 1000, 100)
  .rect2d(0,0,Math.abs(1000-i*10),100,0,1000,100)
  .reverse()
  .saveimg('gen7/' + i, [_.envelope([1, 1, 333, 1, 0, 667])
    .dup(99), _.envelope([0, 1, 333, 1, 1, 333, 1, 0, 333])
    .dup(99), _.envelope([1, 0, 333, 0, 0, 333, 0, 1, 333])
    .dup(99)
  ], 1000, 100)
}).once();

# then ran ffmpeg command: ffmpeg -framerate 24 -i %d.png -c:v libx264 -pix_fmt yuv420p gen7.mp4