首先，让我向您展示代码：
import vlc
player = vlc.MediaPlayer('rtsp://admin:admin@IP:554/cam/realmonitor?
channel=1&subtype=1')
player.play()
if(player.video_take_snapshot(0, imgname, 0, 0)) == 0
im = cv2.imread(imgname)
....
但是出现错误：
live555 demux error : Nothing to play for rtsp://admin:admin@IP:554/cam/realmonitor?channel=1&subtype=1'
main access error:cannot resolve admin port 0:name or service not known
access_realrtsp access error:cannot to connect to admin:0
main access error:connection failed
main access error : VLC could not connect to 'admin:0'
main input error:open of 'rtsp://admin:admin@IP:554/cam/realmonitor?channel=1&subtype=1' failed
main input error : your input cannot be opened
main input error: vlc is unable to open the mrl 'rtsp://admin:admin@IP:554/cam/realmonitor?channel=1&subtype=1'
但是我们使用ping命令测试Internet连接，它表明连接正常，我们尝试使用：curl IP:554连接554端口（554是服务器的rtsp控制端口相机），则显示错误：curl:(52) Empty reply from server
最有趣的是，三天前，相同的代码可以正常工作，我们该怎么办？
谢谢！！