C# WinForm - RTSP IP Camera Viewer
Briefly

RTSP is a network protocol for transmitting multimedia data over a network. It's commonly used in audio/video transmission, works on the application layer of the ISO/OSI reference model, and the default port is 554.
Practically every IP camera or NVR supports RTSP, but sometimes enabling RTSP and specific addresses might vary based on the manufacturer. VLC library can easily play RTSP streams in C# WinForm applications.
Read at CodeProject
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