There is a few delay to capture frames from IP camera

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I've a Dahua IP camera. I want to read frames from it. The connection string is: rtsp://user:pass@ip:554/live. I've found that rtsp use network caching. In VLC, there isn't any delay when I use ':rtsp-caching=1' or ':network-caching=1' but some frames are lost. Also, in web browsers, there isn't any delay. As I found, there are two solution to solve my problem: 1- using http protocol: but I can't find the http connection string!! 2- using rtsp with less caching size of protocol: but i can't find this parameters in OpenCV, OpenCVsharp or Emgu!!