someone else on different forum:
"in my case, the 6320 screen sees the dahua cameras as only one stream, the main one, so I had to set h264 and now:
camera no. 1 is previewed on the screen in 2560x1440
camera no. 2 is previewed only in 1280x960
the cameras are identical, they have the same firmware version:
Device TypeDH-IPC-HFW1439TL1-A-IL
System VersionV2.860.0000000.29.R, Build Date: 2024-08-23
WEB VersionV3.2.1.2017784
ONVIF Version23.12(V2.0.1.0)
S/NAH0E0C3PAG02494
Algorithm Version1.0.6
Security Baseline VersionV2.4
at this point the recorder switched to the sub stream which is bad, I think it's better instead screen hang a regular tablet on the wall.
maybe someone can advise how to force the 6320 screen to use sub stream in dahuna camera"