ZoneMinder

I've been tinkering with four 4k Lorex cameras hooked to a Zoneminder system running on an 8 core AMD APU machine w/16GB RAM booting Debian and two 4 TB disks for capture storage. ZM was installed natively via the Debian guide, no docker involved. ZM runs, the cameras work great, I have them all connected, configured and displaying in Zoneminder as monitors.

I am having trouble trying to figure out mocord with 4k cameras. I initially set them all to mocord and the zmc processes ate CPU and RAM until they fell over from OOM in mere seconds. Reading up on this the fix is to use the cameras low resolution substream for motion analysis and trigger recording the 4k stream to disk. Though I am not sure how this is accomplished. So far I have:

• Configured two monitors for each camera: the 4k stream and the 720p substream.

• Configure the substream to modect with analysis enabled.

• Configure the 4k stream to nodect with analysis and decoding enabled as well as setting the substream as a linked monitor to trigger recording.

I configured one camera like this and it doesn't appear to trigger any recording. In addition, the substream camera shows up in the montage displaying the same camera twice. I also still see heavy memory usage with /dev/shmem consuming 7GB but ZM reports it is only using 475MB of that 7GB or 6% which seems like a waste of RAM. Htop shows my 16 GB machine is sitting at 14.1GB mem and 2.75GB swap and all the zmc processes at the top of the memory use list.

I still have more research to do but any help to getting these things configured to record without filling up RAM or eating CPU until the machine falls over is greatly appreciated. I also just built a second system at another location using the same cameras but running on an older 12 core server with 32GB, same install procedure though it only monitors, no recording yet.