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I have some additional information.
The URL rtsp://192.168.88.130:554/onvif1 will open in VLC.
Opening the camera in an ONVIF utility (on my android phone), I receive the following:
Network Video Transmitter (NVT) name: IPC_778939 NVT type: ONVIF Model: IPC Address/URL: 192.168.88.130:5000 Media Profile: MainStream Resolution: 1280x720 Encoding: H264 H.264: Baseline Profile Level: 3.1 Transport protocol: RTP/RTSP/TCP RTP packets received: 2634 RTP packets lost: 0 Frame rate (fps): 12.5 Audio: G.711 A-Law ONVIF port: 5000 RTSP port: 554 Data Rate (Mbit/s): 2.698 1491413267411:1491413267411