The stuttering (not smooth) : MPG 274URDFW E16M

[dubigny154402d7]

I found a major bug. When I select MPRT in the OSD menu, if this setting isn't configured with a specific refresh rate, the screen goes black and loses all signal. You have to restart the computer or press the keyboard key to switch to HDR to disable MPRT.

Regarding the stuttering (not smooth) issue, if anyone knows how to fix this for online videos and streaming on offline media, I'd appreciate any information, since we're talking about fast fps here. I tried SDR in native 1080p dual-mode, which helps a little. If I set it to 60Hz, I get artifacts, like watching an old VHS tape, which is even more annoying.

I tested it and enabled hardware acceleration, but it didn't change anything. I also had a 1080 with an old, discontinued NT LED panel; I didn't have this problem and didn't notice this stuttering issue.

I had this problem on a 27" VA panel as well, although I experienced other slowdowns in games with the VA, but I thought the FAST-IPS setting might fix this issue for videos. I tested the native 24" OSD setting in SDR, which mitigates it somewhat, but not completely, which is still surprising. ChatGPT can't tell me anything other than that it's normal for 25fps videos. And that TVs don't have this problem because they have Dolby Vision, which handles the refresh rate and frame rate conversion. It suggests using AI modifications to adjust the video FPS, but my Apple TV BOX sometimes stutters too, even though it has its own Dolby Vision system. The videos don't stutter at all when I connect it to a Bimmer (cinema projector), so I find it hard to believe that the video FPS issue is the problem itself.

 

[dubigny154402d7]

J’ai installé la 5070 Ti de zéro avec une réinitialisation du pilote après l’avoir nettoyée avec le logiciel DDU au préalable, mais cela n’a rien changé. Cette fois, j’ai le VRR (Dynamic Refresh Rate). Mais rien n’a changé. Sur le boîtier TV, il n’est pas connecté via PC, mais directement au boîtier Apple TV via HDMI, et là aussi, il y a parfois des saccades, mais moins que sur PC. J’ai essayé de désactiver le DSC dans le menu OSD, plus précisément dans le menu Game, mais cela m’empêche de rester à 160Hz, m’obligeant à rester à 60Hz. Si je règle un maximum de 144Hz, par défaut c’est 1080p. Je peux le régler à un maximum de 120Hz. Je voulais voir si le DSC résoudrait le problème de moins de saccades dans les vidéos et sur l’Apple TV, alors je l’ai réactivé puisque je ne peux pas non plus le régler sur 10 bits ; cela me limite à 8 bits pour le RGB complet dans les couleurs du panneau de configuration Nvidia. En réactivant le DSC dans le menu OSD, plus précisément dans le menu Jeu, la couleur 10 bits revient, les couleurs redeviennent vives, et la luminosité HDR1000 est correcte. Ensuite, le taux de rafraîchissement de 160Hz revient en 4K natif. Je commence à penser que ce n’est pas un problème de carte graphique ou de réglages de l’ordinateur, car même connecté via HDMI au boîtier Apple TV, ça tousse quand même. Le moniteur lui-même est-il le problème, ou mon écran est-il défectueux ?
Image showing the difference between DSC ON/OFF settings :

 

[dubigny154402d7]

On Reddit, several people have also reported the same video stuttering issue, mainly in HDR. Some suggest that the screen doesn't have physical VRR (Virtual Refresh Rate), and that's why they think so, but could there be an update to improve this?Because adjusting the refresh rate doesn't change anything, and in 1080p dual resolution, it doesn't change much except to exacerbate the poor video quality and color distortion. On a 24" screen, you start to see flickering and accentuated artifacts, as if you were watching an old VHS tape printed on a film strip.

 

[dubigny154402d7]

Okay, this discussion helped me understand something. (

https://www.reddit.com/r/LGOLED/comments/11cn840

)

I went into my Apple TV's settings.
With its TV technology, there's a setting to adapt the picture frequency and dynamic range, and I turned it on.
It was off before.
It's better, but it's not perfect. Why?
I'm starting to understand that it's the 4K mini-LEDs; the more zones there are, the more this stuttering issue occurs, as if the image jumps and freezes in microseconds, it's not smooth.
So, for example, on a 2300-zone system, this issue will be even more pronounced.
Each LED zone adjusts itself individually for HDR. So, the more zones there are, the slower the update is for certain fast-moving details.
And, with 4K, there are more pixels in the time response time per frame. So, 1080p screens, which also have this issue, show it much less, and our eyes barely perceive it. That's why I didn't see these problems on a standard 1080p 60Hz screen.
And, Nvidia and Windows don't handle video adaptation; there's no match frame rate or match dynamic range for videos. Standard LED screens with lower resolution and smaller frame sizes also have micro-movements that are less sensitive to the eye, so we don't see any stuttering or juddering.
Therefore, I shouldn't talk about stuttering, but juddering. The problem likely stems from LED zones adjusting individually, where micro-variations in brightness are slow. Internal motion processing doesn't exist in the screen settings or in Nvidia, and each pixel updates at slightly different speeds. This results in visible micro-stuttering during fast movements in movies and on YouTube, even with a stable FPS.
And sometimes, micro-stuttering is even visible in close-ups of normally moving images with too much detail.

See a video example of the problem I'm seeing:

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It's much smoother if I switch to 1080p dual resolution in the OSD settings for YouTube videos. However, I paid for a 4K monitor, not 1080p, which is only suitable for competitive gaming. Watching 1080p videos with very poor color and HDR1000 quality is unacceptable; there's definitely a problem with this 4K monitor.