Ask HN: How do I send video output of a program on one Mac to another Mac?

Apologies if this question is off topic for HN. I am desperate.

There is a plethora of hardware and software solutions for capturing video, sharing desktops and streaming videos to TVs out there. None of those seems to be applicable for my specific problem.

I am posting here in the hope that some creative video minded person might be able to help. (Pointers to better places to ask this question are also appreciated.)

Question: On my two Macs I would like to send video output (from Resolume Avenue, Pure Data, Processing, whatever) via ethernet to a second machine. Preferably in a way that would allow to use the stream as a video input device in Quartz Composer or Resolume Avenue.

Is there a software to do this?