Greenish effect with fading effects

[Kirika-]

Also post your Make/Model monitor you are using and what Make/Model/Grade video cable (and is it HDMI or DP) you are using from the video card to the monitor.

[dragoonMage]

Video is here.

I'm using the Insignia 4K Ultra HD HDMI Cable (just bought it today, cos my prior one is 13 years old and I figured that may be the cause); model number NS-HG08505.

My computer is plugged into a TCL Series 6 55" 4K television; model number 55R615.

[Kirika-]

Sorry for the delay, been busy on my end

What you are seeing is a side effect of the image control of the TV.
Try toggling through the options in your TV's "Advanced picture settings" menu for the settings that handle "Video Interpolation" aka Motion Smoothing, which will be somewhere under:
Picture Mode
Local Dimming
Dynamic Contrast
Action Smoothing
LED action clarity
Natural Cinema
etc...

Somewhere in there will be the option that is causing it.

What you are experiencing is basically what is known as "The Soap Oprah Effect" that HD/4K Smart TVs have, were it's built in imagining system "mishandles" the input video to the point it looks bad with off colors, choppy motions, and/or flashes in brightness.
The fix is to disable that handler which then just passes through the video as-is (meaning then your video card's output is correctly displayed), however each TV manufacturer names and hides it differently within the TVs menus.
The purpose of the Video Interpolation system is so that video from older lower frame rate sources will "correctly" display on the 60+ refresh rate TV (say a 30fps DVD 720p movie up-scaled to 4k 60hz), by filling in the blanks so to speak on the gaps between the source frames and the output frames. The downside is that when fed a computer game video, where the FPS changes a lot, it can overload the Video Interpolation handler so it starts getting all ugly.

Info:
https://www.digitaltrends.com/home-t...o-turn-it-off/