How do I "drop every other frame" in SVP4?

I'm watching a Twitch.TV livestream via livestreamer -> MPC-HC of a guy building a new PC, and he's broadcasting at 60fps even though his webcam is only recording at 30fps.

So, if this was still SVP3, this would be the perfect use-case for me to enable the "Drop every other frame" option...but I can't find such a setting in SVP4.

Note that I can't use SVP 3.1.7 because it gives me weird flickering that I never got with 3.1.6 nor SVP4, but 3.1.6 is considerably slower.