Solar panels are always improving, check the latest & greatest specs vs what you now have.
And since you use the cam at night, assuming you are using the solar to charge a battery. Look into the latest lithium batteries.
I believe you mean a video cable (VGA or HDMI) and not Serial (RS232)?
Is there are flicker when only viewing the menu? If no, doubtful this is a resolution issue but check by changing the NVR output resolution & test - typ. is 1920x1080 (1080p).
Camera setting can sometimes cause the moire...
Back in the day the Adult Entertainment Expo was held in Las Vegas the same dates as CES - those were fun nights!
They switched ~ 2012, that was my last CES show.
Cisco is way too $$ for the average user. Polycom is now just Poly - less expensive but like Cisco geared towards corporate needs.
Recommend checking out the Logitech conferencing products. Good selection from personal VC to large conference rooms & covers most platforms.
All ^^^ browsers use Chromium (Chrome, Edge Opera, Brave & more) as their code base, Firefox is the exception.
They add their bows & ribbons on top of Chromium to cater to their needs.
Cheaper, easier & better solution - will prevent any hum or interference:
Use CAT6 balens to extend Audio signals. Many venders make these, I prefer RDL, they have extenders for balanced & unbalanced audio, passive & active Tx & Rx.
It does have an IR rcvr, typically located somewhere in the front of the unit. Sometimes easy to find by shining a flashlight into the front.
Shortcut fix is to block the front of the NVR.
Another option is to change the IR device ID of the NVR by following the manual instructions, page 18...