https://github.com/OpenIPC/

https://team.openipc.org/ipcam_dms/ (note the english translated link)

Be sure to firewall your cameras on your router to only intranet, do not let them access internet or they phone home

(you can let them sync time by capturing ITP requests and running your own service on your router)

We also got hammered by a patent troll because apparently, the math behind stitching fisheye lenses into a flat video plane is somehow patented.

This seems to be a thing for the commercial broadcast space:

* https://en.wikipedia.org/wiki/VISCA_Protocol

As opposed to the more security (residential?) camera protocol of:

* https://en.wikipedia.org/wiki/ONVIF

* Comparison: https://ikancorp.com/choosing-the-right-ptz-control-protocol...