NVR hard disk video recorder is connected to easycvr through the national standard gb28181 protocol. What is the reason why the device channel information is not displayed?

EasyCVR The video convergence cloud platform can support a wide range of access protocols and device types , Including the national standard GB28181 agreement 、RTSP/Onvif、RTMP etc. , It also supports manufacturer private agreements and SDK, Include HIKSDK、DAHUA、 The sea, Ehome etc. . The platform can be distributed RTSP、RTMP、FLV、HLS、WebRTC Video streams of the same format , Can realize full terminal 、 Full platform coverage .

There's user feedback , stay EasyCVR In the platform , Passed the national standard GB28181 Access Agreement NVR Digital Video Recorder , But the platform does not display device channel information . We checked the situation .

The investigation found that , When refreshing channel information , Device sent catalog, however EasyCVR It's all due to not parsing catalog news . Through packet capturing analysis, we know , This catalog The news is 3717bytes, After network transmission, it is sent automatically , Lead to EasyCVR Unable to read the complete package data , Therefore, the channel cannot be displayed .

Found in code ,EasyCVR Read TCP Packet time , It's not dealt with TCP Subcontracting . Then it needs to be optimized here , reading TCP Data time , Determine whether it is subcontracting ：

After optimization according to this method , Accessed by this user NVR The device information can be displayed normally .

EasyCVR In complex network environment , Gather all kinds of scattered video resources in a unified way 、 Integrate 、 centralized management . In terms of video capability ,EasyCVR It can realize live video real-time monitoring 、 Cloud video 、 Cloud storage 、 Playback and retrieval 、 Intelligent alarm 、 Video snapshot 、 Video transcoding and distribution 、 Platform cascade, etc .

The platform is based on the cloud edge end integration architecture , Unified management of complex and changeable underlying resources , And can reasonably schedule resources 、 Share Information 、 Data interaction , Make the system more efficient 、 Stable , Achieve better collaboration among modules . Interested users can go to the demonstration platform for experience or deployment testing .