I encountered two problems with the green screen keying, the first is the keylight after the machine side will also show a little green, so I used a roto to fix, adjusted to alpha, so that it restores the original color of the machine. The second is the above recording rod through the problem, I also want to use roto to solve it, but roto after that part became a black background, so I tried to adjust the parameters of roto. You can see the two bezier curve in the color side of the mode is different.