How VideoWallSetCamerasCommandData work: The Collection<FQID> VideoWallSetCamerasCommandData.CameraFQIDList auto sort FQIDs?

MIP
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1

I was trying to use VideoWallSetCamerasCommandData to configure

four cameras to be displayed on an monitor with 2x2 layout.

Let the following “drawing” my monitor on Smart Wall of

Milestone XProtect Smart Client, with A, B, C and D as the monitor screen:

---------------------

| A | B |

---------------------

| C | D |

---------------------

______||_______

And I want to:

  • send FQID of camera 4 to screen A;
  • send FQID of camera 3 to screen B;
  • send FQID of camera 2 to screen C;
  • send FQID of camera 1 to screen D;

Those cameras will be sorted and displayed as follow:

---------------------

| 4 | 3 |

---------------------

| 2 | 1 |

---------------------

______||_______

I also tried sending with two/more identical FQIDs so that two/more of the screens will be displaying the video feed from the same camera, but only one will be displayed.

Expected outcome:

---------------------

| 4 | 3 |

---------------------

| 3 | 1 |

---------------------

______||_______

Actual outcome:

---------------------

| 4 | 3 |

---------------------

| 1 | null |

---------------------

______||_______

Attached with my code snippets below.

//1 add target cameras FQID into collection, including null camera FQID
Collection<FQID> CollectionCameraFQID = new Collection<FQID>();
 
//2 add camera object to collection, where cam1,cam4, cam3 and cam2 are FQIDs of camera objects.
CollectionCameraFQID.Add(cam4);  
CollectionCameraFQID.Add(cam3);  
CollectionCameraFQID.Add(cam2);  
CollectionCameraFQID.Add(cam1);  
 
  //3 Initialize VideoWallSetCamerasCommandData
 VideoWallSetCamerasCommandData VMS_SetCameras = new VideoWallSetCamerasCommandData
{
   CameraFQIDList = CollectionCameraFQID,
   Position = 1
};
 
 //4 Compile message
VMS_message = new VideoOS.Platform.Messaging.Message(MessageId.Control.VideoWallSetCamerasCommand, VMS_SetCameras);
 
 //5 Send message to video wall
EnvironmentManager.Instance.SendMessage(VMS_message, VMS_FQIDSelectedMonitor);

I found a solution by dividing and sending them in four commands with only only one camera FQID and different position for each of the command,

but the performance is slow.

2

This is unfortunately due to the design of the smart wall feature. The order of the listed cameras is (as you have also observed) not preserved by the internal communication system. Same for the duplicate camera IDs - only one will be passed on.

Unfortunately the only way to get around this is the way you have already done it - by sending multiple commands.

I will pass on your request to our product management, so that they can take this into consideration for future releases.

3

Okay, noted.

Thanks for the reply.