Easycvr cannot be played when cascaded to the superior platform. Troubleshooting

EasyCVR Video protocol convergence platform not only supports the access of conventional protocol , We also expanded Haikang SDK、 Dahua SDK、Ehome Private agreement . If the front-end device protocol is different and the number is large , You can use the EasyCVR Platform to integrate and manage all video channels , meanwhile EasyCVR Also support with other support GB28181 Platform cascade of protocol .

We have solved many problems EasyCVR The problem that the cascade cannot be played , In this article, we will share a similar case with different reasons . In the following projects ,EasyCVR Cascade to the upper platform , There is a problem that a video stream cannot be played and the display screen is black .

This problem is first analyzed through packet capturing , The packet capture finds that the superior platform has sent INVITE Play command , however EasyCVR The platform did not reply .

Check the field and find Subject The value in does not conform to the specification .

standard Subject Values are described below ：

So we followed the rules , Modify on the parent platform GB28181 agreement Subject In the value of the , The correct example should be as follows ：

Play normally after modification , The video preview is as follows ：