Video quality depends on all of those factors:
1) Internet speed (2+Mbps stable UPLOAD stream with low latency)
2) Webcam device/hardware (Logitech C910 or better)
3) Light intensity - webcam sensor is pretty small and to be able to grab 30 FPS the light should be bright enough or sensor will need more time to grab video frame
4) Avoid flickering (Light frequency should be compatible with frequency of webcam FPS)
5) Fast CPU required. Even 2 similar i5 based laptops would give a different result. Laptop should be fast enough or it would not be able to catch 30 FPS
Check any popular websites and you will see 90% (more or less) of webcam streams are pretty bad, only small part of girls/studios can set up good hardware/light/room/furniture and get high attention from customers. You will also realize good quality streams always stay on top of online models list - that's why you might think webcam site is good. It more depends on video stream coming from girls
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