Hello, I have a strange performance problem with a standard and very simple webcam capture prototype. I am using openCV inside Unreal engine (if that changes anything). I read() a frame from my webcam every .033s (30fps capped) at 640x480. The CPU is not a problem :)
If my webcam is pointed at light colors, mainly a white frame, the fps is at 120 (the whole app is capped at 120). But whenever I move the webcam, to record things with darker colors, the fps drops to 8 frame per second!
I've been profiling a lot, and all my cycles are coming from 1 line: cap.read(f). This is extremely strange to me, and I am going to guess maybe openCV has defaults that do image processing? Anyone has experienced this before? Should the read method be deterministic?
Thank you for any help, I am just starting out with openCV, so it could be something really simple :)
P.S. Using windows build (x64) v3.1.0. These are unmodified from the download.