video stability issues

[JamesLDCC]

I have installed Zoneminder 1.34 on Debian 10 as per the install guide and I'm having issues with video from the capture cards not being stable.
it's like having a bad connection to the cameras -- horizontal lines through the image and parts of the image missing. Connections are all good.
I have reinstalled Debian 10 and I have also tried installing Opensuse 15.2 but having the same issue on both installs, previously I had Debian 9. and Zoneminder 1.32 installed and had no issues at all but my hdd failed so I thought I would install Debian 10.

Any help is much appreciated.

The pc.
AMD Athlon II x2 245 2.9G
Mainboard MCP61 4GB DDR2
2 x Geovision Gv-600 Pci 4 input cards

[burger]

I've used some other brands of capture cards, and while those can work, they are not convenient. I would recommend instead of capture cards, a video encoder. See https://wiki.zoneminder.com/Hardware_Compatibility_List I have been happy with Axis encoders. I don't recommend DVRs.

Since the capture cards work with the Kernel, you can have compatibility issues with drivers. It isn't always a problem, but there is no guarantee that future kernels will not break compatibility with the old device drivers (which may work 100%). For the capture cards, more information on how they work is at the video4linux wiki.