No this is a local 4k file that I always use when testing out different settings on my tv(interpolation) or jrivers JRVR hdr settings. When I download a movie sometimes I get full download speed which is 100 Mbps when seeders are good enough. And the test-speedometer is showing that it is ok. I have done the taming of defender procedure and chosen even more folders and files that is suggested. I have seen that this irratic performance of movie rendering is something that I see at my parents tv or my brother´s tv and I have seen it in tv store(could just be motion settings is off) as well. but I concentrate on my parents (which I see often) and my own tv. The very bad rendering and stuttering that I had initially or at the start of this thread, are mostly gone now. But sometimes it happens. It is something interfering and it is not JRiver software. This is very strange and it is not one movie file or tv channel ( I dont' watch so much tv).
Anyways...I have most of the time good rendering now, either with JRVR(highly recommend and which I use) or Madvr. JRVR is unik because, 1.It is very easy to use 2. high picture quality and with low impact on your gpu. I dont know of any other renderer that deliver this combo high picture quality/very low impact on the gpu. (I chose the quality preset and even tweaked a bit more and chose FSRCNNX 8 (advanced upscaling doubling) and under advanced, I chose to untick "Allow HW decoder direct rendering on mismatches size(a qualitytrade for better performance) and also chose jinc on downscaling. In OSD the rendering shows 4.6/4.7 milliseconds which is very good imo(HDR mode). Lgs trumotion, dejudder at 6 or even 5 and BFI off. It is much more smooth and I have less unvanted jerky or shimmering effect on the edge of moving object especially in a bright picture/high contrast senario, like the start scene(white room scene) of Alien Covenant. My gpu is msi ventus rtx 3050 8 gb and I built a new desktop back in may/June, which is updated in OP.
I Am much more happy now than in the beginning of this thread. So there most likely where many factors contributing, like my rtx 3050 gpu was brand new and got better with newer nvidia driver, Bios updates(I read several bios updates mentioning cpu performance and cpu settings), updates on the TVs firmware, and improvements on the JRVR renderer( I noticed improvement after the launching of JRiver 30) and at last one get to know how the features in JRVR and Madvr and picture settings on my tv works and what work not so good.I ended up using JRVR :-). And Madvr has been dead for a while now and dont do any developments anymore and also requires a better gpu. I also ended up on using dejudder at 6 or even 5. Set it to high, one get too much unwanted/unatural motion(the motion itself or like fast motion get glitchy or uneven). with the Lg C2 I would guess I could lower it to between 3 and 5, as C2 did a huge stepp forward in motion processing, truemotion(their interpolation tool/dejudder for 23 hz movies). C2 also got way less artifacts from the use of interpolation, much lower.
The best result I have seen is 5:5 pulldown with only Bfi at low or medium, no other truemotion/interpolation in use and lock JRiver to show 2160p119/2160p120 to force the pulldown and smooth motion ticked off(madvr setting), but I get glitches that shows up in the OSD(glitches I remove by lowering the qualitysettings in madvr), colorless and blackblinking when I use madvr exclusive picturemode setting(which I need, otherwise I get a stuttery and shimering effect on moving objects. So inbetween all the blackblinking...is see superb motion, no shimmering or stutter or microstutter. But I dont know if what I see counts, due to so much is not working as it should (blackblinking and the colorless picture could hide ex. shimmering effect on objects in motion (alien movie)). But I have looked closely and I Am pretty sure it is pretty perfect, as eve wrote earlier in the thread. That said, I Am very satified with what I get by using JRVR. I used to use dejudder at 7 and that even did not do it for me sometimes. Now I use only 5 or 6 or just choose natural motion choice in truemotion. Also the artifacts are less visable too( I aslo think Lg has got better interpolation implemented in their truemotion software through firmwareupdates). Thumbs up for Jrivers renderer(JRVR) which now is very good and more is to come, I read now on JRiver 31, especially tonemapping looks interesting :-).