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The function SendEmptyFrames(false) called once before starting the camera does have an effect: at least the algorithm leaves the above "while" loop now. However, the application seems to slow down and i do not have responses from the cameras regularily (i use 2 cameras, making shots in turn).

Ok, i found the error:
while(!frame) { frame = camera_01->GetLatestFrame(); }
here the frame must be released every time in the loop