I have reported this issue before. The previous post is https://support.networkoptix.com/hc/en-us/community/posts/4418176150807-Plugin-receives-primary-and-secondary-stream-back-and-forth- . I observed this issue at 184.108.40.206660. I am still seeing the issue at 220.127.116.11785.
We implemented two plugins. One is a plugin that performs analytics inside the camera and delivers only the results to Nx VMS. (I'll call it Edge plugin) The other one works on the server, receives an encoded stream from Nx, performs analytics, and delivers the result to Nx VMS. (I will call it a server plugin) It is assumed that the user installs all plugins for convenience.
A problem occurs when two plugins select different streams.
The server plugin returns the manifest string as follows.
(The reason for doing this is that the server plug-in wants to use a secondary stream by default. Nx tells us that it works only by doing this. However, this way, the user cannot select a stream. This is not what we want.)
In this state, if the Edge plug-in selects the input as the Primary stream, both the Primary stream and the Secondary stream come to the server plug-in, and the two cannot be distinguished. And the plugin doesn't know if all frames are coming or not.
If the input of the edge plug-in is selected as the secondary stream, the server plug-in receives the secondary stream normally.
Under the above conditions, only secondary should come as a server plug-in regardless of which stream other plug-ins select.
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