板子是德邦威视8168开发板，按照DM8168 DVR RDK User Guide 跑RTSP例程，用VLC播放器播放无画面显示，终端打印信息如下：
root@dvr:/opt/netra# ./wis-streamer
NetraDrvInit: 9
NetraDrvInit: 2
queue id:0
NetraDrvInit: 6
NetraDrvInit: 8
queue id:0
Initializing...
Failed to create RTSP server: bind() error (port number: 8551): Address already
in use
queue id:0
queue id:0
Initializing...
Failed to create RTSP server: bind() error (port number: 8554): Address already
in use
Initializing...
root@dvr:/opt/netra# Initializing...
Failed to create RTSP server: bind() error (port number: 8553): Address already
in use
Failed to create RTSP server: bind() error (port number: 8552): Address already
in use
求各位大虾指点
