>>1006097
FFmpeg recordings using USB cameras, with a timestamp overlay.
This is one of the few times you should just bite the bullet and get a camera setup that works offline, then firewall it.
Most big name shit cameras don't work without access to botnet, so avoid those, but the other big names like dahua and hikvision do work without botnet.
Any pre-made sets are preferable to rolling your own, as they have perfect pixel overlay for the date/time, which also changes the colors of the pixels comprising the text according to the brightness of the background image.
Somehow they introduce the overlay into the encoding stream in such a way that the encoder never blurs the date/time, which can be used for authentication.