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Two things.
First is @Chainik saying that I no longer need to use copy? The manual still says use "copy-back".
Second, I thought @Blackfyre said that there was no difference between d3d11va and copy and I didn't see those differences in pictures. To me that made sense because it the mechanism should have nothing to do with color. But I see there is a massive difference in the two pictures which I must have somehow missed. But a possible explanation for the difference would be that it is being affected by SVP which brings me back to my first point.
So still confused.

What happens to your performance when you use copy? I assume it goes down?

Not gpu-next. That has nothing to do with this.

Unless a dev comes on and tells me that the way SVP has always works has now changed, then whether you recognise it or not, using d3d11va and not d3d11va-copy means that SVP is not working properly.

You're kind of mixing up colour with banding but I get what you mean. I did say that hwdec can affect banding depending on the card and parameters used. What happens if you set hwdec=no? If you still have the same banding then the issue is definitely not the card or hwdec but is probably your display and its setup. If the banding disappears then you need to check your card settings.

One of the reasons mpc-be came out was because HC was a dead project. But I forgot that it has been restarted. I've updated my original post.

The reason you get better performance with d3d11va over d3d11va-copy is because with d3d11va SVP can't properly process the frames. d3d11va-copy copies frams to system ram where SVP has full access to them. So unless SVP has changed and somehow has direct access to GPU memory, you need to use copy. But you probably already know this and you were just joking.

No. One of the reasons I switched from mpc to mpv is that it works better with SVP at any resolution.

I've asked the ffdshow question myself a long time ago. I don't remember getting an answer so I just set it to false. With mpv there could be a number of reasons for frame drops including a bug in the stats page, the hwdec you are using or something else. Also make sure that the SVP index is not lower than 1.0 because if it is then you may have to use a less compute heavy version of Rife. You are just going to have to troubleshoot it. If it's not affecting what you are seeing on screen then maybe don't worry about it too much until you see a problem

The purpose of the "lite" versions were never fully clear to me except for Rife 4.14 "lite" which is different to every model that came before it. But there is no  answer to your question, you just have to try them and see which one works best for you. As of right now, if you don't have a high end card then don't bother with anything above Rife 4.9. Rife 4.13 is computationally heavy even for a 4080. Rife 4.14 "lite" is not "lite" at all unless you have a card with high memory bandwidth like a 'maybe' a 3070ti and above.

I keep saying this but it's worth repeating. If you are new to this then don't do anything you see here because we are experimenting. SVP works out of the box.  Just uninstall everything, go to the SVP Rife AI page https://www.svp-team.com/wiki/RIFE_AI_interpolation and follow the instructions. All the information you need about the Rife, the DOS box and everything else is on that page. Once you have done that then have a look at the SVP Transcoding page https://www.svp-team.com/wiki/Manual:SVPcode. I don't transcode, but once you have followed those instructions there are others on here who can help you with any specific questions you have.

3840x2160 was watchable on the 4080, but with slow pan stutters. I updated the Nvidia Driver to latest version released yesterday and used the v14Test3 TensorRT library (Cuda 12.3) and the latest vslmrt.py with Rife 4.14v2 lite. It's still dropping frames but the slow pans are now mostly smooth. The 4090 should have no problem so you don't need to wait for a 5090.

I currently don't have any intention of using SVP with 4K but this should help to clarify your options.

I installed 537.58 and tbh it made little obvious difference. But the install tool was useful to completely fix some Nvidia driver issues I knew about but had only partially fixed. I just made another back up of everything. Thank you

Not necessarily. I would test 1.14 lite first because the 3080/3090 has a wider memory bus than even the 4070ti/4080 so the 3090ti might work better with Rife 1.14 lite than anything less than a 4090. Hopefully someone can help with other card comparisons.