Unable to Use Multiple Internet Protocol (IP) Cameras as the Inputs for Multi-Channel Face Detection C++ Demo

• Command used for two IP cameras as the inputs for Multi-Channel Face Detection C++ Demo: -i rtsp://admin:gamma@172.18.70.113:8554/CH001.sdp/ rtsp://admin:admin@172.18.70.125:8554/CH001.sdp/
• Encountered error: method DESCRIBE failed: 404 Stream Not Found

Use a comma to separate two IP cameras' addresses instead of a space for the Multi-Channel Face Detection C++ Demo: -i rtsp://camera_address_1,rtsp://camera_address_2