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And, of course, after spending a day googling this with no real answers, I amend my search string slightly and find this, immediately after posting this thread... https://ipcamtalk.com/threads/videoloss-event.43296/ So it appears this is just a version of Homer Simpson's "everything's ok...

I've recently moved my system off constant recording and onto motion and line crossing detection instead. I'm starting to play around with using ISAPI to receive the event notifications so I can do something useful with them. I am receiving a fairly constant stream of video loss event alarms...

Thank you again, Alastair. I finally got time to spend on this today and it all worked flawlessly thanks to your advice and to Scott Lamb's neat python tftp server. I only had to retry one of the cameras as I'd carelessly left the tftp server running too long; other than that the NVR and the...

Right! Ok, that makes perfect sense, thank you. I think I'll have to go that route.

I'm sorry if this is a stupid question but having read the tftp guide I don't understand how I can use the tftp method without somehow first resetting the devices. If I simply reboot them (eg remove their PoE source then re-apply it) will they search for a tftp server as part of the boot...

Unfortunately they're all PoE. I do have PoE injectors for other purposes so I could connect the cameras to those if eliminating the NVR's PoE supply is needed at some point in the process, but it'll be hard to give them a true 12V supply.

Thanks. There are 5 cameras, all are the same model (I've also plugged directly into the NVR and discovered the other cameras' info that way) unfortunately. The cameras are really inaccessible so I'd prefer a method that doesn't involve me having to climb onto roofs or use a cherry picker(!) to...

Hello! I've been reading this thread (and all the linked threads/blog posts) with interest as I've recently moved into a house and inherited a rather nice Hikvision CCTV system with NVR. Only problem is, I can't log into the NVR as nobody knows the admin password. I've emailed hikvision EU...