Media Player on Windows 8 implements "Windows Media Player Network Sharing Service" which uses the default RTSP port that the RTSPServer demo will attempt to use. In such a situation, you have one of two options:
1. Stop the "Windows Media Player Network Sharing Service"
2. Start the RTSP server on a different port.
Products | Support | Feedback: Why Does Starting a Server on the Default RTSP Port Fail when I Run the Windows 8 RTSPServer Demo? | Introduction | Help Version 19.0.2017.6.27
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