Hello! Thanks for reading my post!
The main issue was more between Unreal Process and "python process" (I wrapped StreamDiffusion in a C++ exe).
So I had to find a way to give input frame to this "python process" and retrieve its output in Unreal main process. I used an OS pipe, but it wasn't efficient enough.
This project can be enhanced in many ways, but i moved forward on another project 😅