I close the question of the possibility of using SPOUT as a solution to the problem. SPOUT CAM(even 800x600 30fps mode) causes a significant delay and slowdown) Also, the use of the SPOUT to NDI converter does works without delay, but does not transmit masks (screen).
Zoltán, a demo version of Realizzer is available for free download(www.realizzer.com
). You can download it, test it and find the right way to solve the problem. I beg you to do this. It seems to me that the only proven solution for transmitting a video stream without losing all the attributes from Arena (network and local) is NDI.