I have a 4 year-old Logitech Webcam c920, windows 7 64 bit, and power director 16 and YouCam, and a 24" external monitor -- with no internal webcam, and a lenovo ThinkPad with an internal webcam. I have selected the external logitech webcam.
I can set the FPS in Power Director but I don't think so in YouCam. Of note, however, is that the webcam image in PowerDirector is very different than the one in YouCam. In PowerDirector, my head is at the top of the screen. In YouCam, it is centered. I don't know why. In both cases, the resolution of the webcam image seems low, even if I set it to 1080 by ... in the software. I suspect that my WebCam may need to be replaced.
I will have to try out the settings suggested in the link above, however, the logitech software is not the friendliest to use. Perhaps I can find another webcam settings software package.
Thank you