Dumb member need help understanding

[Basjke]

Those are HDCVI analog cameras. They dont have IVS
Your XVR "might" have it and usually limited to I believe 4 rules

Regardless, my opinion on your original question is to use h.264.h, bitrate no less than 4096, 15FPS, record full time (green) PLUS motion and or IVS, check and record snapshots, and see what you get as far acceptable coverage and storage. I'll guess 14-21 days

If however your sole focus is on storage and not image quality or capturing the many things that may happen before or after your motion event gets recorded (which wont always be as precise as you imagine) you may want to consider a simple trail cam instead of an NVR and cameras.

Thanks for your reply. I suspected that HDVCI cameras don't support IVS, also because they are built 2017, and at that time I even never had heard about AI.
So, even in case my XVR has the setting, it still won't work?
I also have been reading up on motion vs IVS, and it seems the former option is less reliable, especially in my case where there are trees in the picture. I also understand that snapshots are recorded on an internal SD. Any idea what the limit of that SD card is?

 

[bigredfish]

No HDCVI cameras have IVS capability themselves even the newest ones. That is an AI type process that requires technology analog cameras simply dont have.

You may be able get it to work in limited fashion IF your XVR supports it. It may only support it for IP cameras. Yes it is vastly superior to old fashioned Motion Detection.
It only take few minutes to find out. Go to your XVR and look for IVS under Events. It may not even be visible until you activate IP cameras. You cant break it.

I dont believe your cameras have SD card slots? No your XVR doesn't.
Regardless, no, just check the buttons for record mode ON for snapshots on your XVR storage tab

 

[Revo2Maxx]

Amcrest 8ch Xvr was only allowed ( by design) to accept 2 IP cams, by giving up 2 Analog channels. so not much of an opportunity for substreams saving space on the drive.

Sorry not true. Yeah sure my Amcrest 7204 only supports 2 IP cameras but that is OLD DVR and not an XVR but my 16ch supports 8, my 5108-i3 8MP supports 8 and my older 7108-Ai also support 8 and that is on top of the Analog channels but yes does remove AI so why buy an AI DVR if the sole reason is to use as NVR.. Then truth be told I can remove all analog channels and make the DVR a complete 16ch or 24 ch NVR or XVR if you will.. But that isn't even what this is about.

And Analog cameras are not Ai it is in the DVRs setup AKA your XVR, this is where a dvr and NVR differ. The DVR is where all the magic happens for the cameras in most part. Sure some cameras offer OSD and can change image quality or change the way IR is used or add in Camera names.. But in an NVR all that info is from IP cameras. So with your CVI camera connected to your BNC cable to your XVR you can access that OSD by PTZ control of the XVR over what is called UTC.. There if your camera supports it you can change Encoding like my 5mp cameras I can run as 4mp or 1080p and I have to make that change in the cameras OSD.. Then once that is changed the DVR will also make that change.. But sub channel is done at the XVR level.. Here is a picture of my XVR that is really a DVR and my VERY old TVI 2mp from 2016 use UTC to access my OSD..