I am doing something similar as well. I am sending live video from one of my six unity cameras to a separate QT application using TCP. I have found the only way to remove the lag that occurs in Unity when taking progressive screenshots (about 1 every 0.1 seconds) is to use a small render texture (i am using 256x256). I then send all the pixels over TCP and reconstruct the image at the other end.
Let me know if you know figure out a better way.
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