Can I stream video from an analog camera to a DVR?

Question

CCTV

There is a facility with several dozen analog cameras and a couple of antediluvian DVRs. There is an idea to slowly upgrade to digital, but it is impossible to replace all the cameras at once.
Is there any adapter that can plug analog cameras into digital? Or is such an adapter unprofitable in terms of money?

Answer 1

1 option. Most likely, your DVRs are able to give an RTSP stream per channel. We pick them up and write them with an IP video recorder.
Option 2. Purchase of AHD/CVI/SDI DVR. Slowly change the cameras, without re-laying the cable. As a rule, in addition to supporting AHD/CVI/SDI, analog CVBS cameras are also supported.

Answer 2

There are no normal, cheap and autonomous solutions. You can pervert, take a rasberi pi, take a simple capture board with a usb connection from China, write a converter for linux from the capture card to onvif and upload the code to raspberry. Dalle - install these things and use analog cameras as onvif devices.
It will be more expensive and more expensive to pull a twisted pair cable instead of coke and buy new cameras (decent ones cost about 100 bucks)

Answer 3

If Igor B is satisfied with the maximum resolution of 2MP, then the best solution is to replace the DVR and the required cameras with those that support AHD/CVI/SDI/TVI. It's up to you to decide which standard you need.