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Display Settings Automatic Change Mode

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IAM4UK:
My primary PC that runs MC 25 sends its signal via HDMI to a Marantz SR-7013 AVR, which sends the video to an LG OLED panel with 3840x2160 resolution. I have the AVR setup to pass the video signal through without scaling or "enhancement." I would like to rely on the OLED for scaling, so I would like for MC to send "native" signals from various content I play.
To get this result (and so far, I've failed), I have tried "Options/Video/Display Settings/Display Settings automatic change mode" set to "On" and also set to "Custom" with various settings per type. But there aren't enough types specified for the kinds of content I play, so "Custom" doesn't yield usable results. (For example, FILM [23.976 fps] comes in at least two resolutions for my content [1080p and 2160p], but there's only one such setting selectable.) And "On" doesn't work for "...automatic change mode." Also, curiously, although I have "NTSC (29.97/59.94 fps)" set to "1920x1080 at 59 fps," that setting is ignored whenever I play NTSC cable television content...MC upconverts it to 3840x2160.

Any ideas how I can achieve the desired result of "native" signal from PC through AVR to OLED, where it's finally scaled to the fixed-pixel display resolution of that panel?

BryanC:
In this case wouldn't you just want to lock the panel at 4K and disable Automatic Change Mode altogether?

If not, you can use custom madvr profile rules to achieve your desired result.

wer:
I have a similar setup to you, with an LG OLED.  I don't do much 4k however.

Your desire to have the LG do the scaling is understandable, as the scaler is very good.  However, after having done quite a lot of testing during the setup of my system, I would recommend you make one change in your thinking.

My suggestion is that you let MadVR do the scaling for NTSC content.  With the proper settings and the more advanced scaling options turned on, you will get a much better final image with MadVR scaling than sending it untouched to the LG.  To do this you set the output resolution for NTSC to be 1080 (or 2160 if you prefer).

As far as 1080 vs 2160 auto switching for your HD vs 4k content, I believe you have something of a catch-22.  As you have seen, MC is a bit deficient here, and does not allow separate settings for 4k vs 1080p, since it only has one setting for the 23.976 framerate.  I wish JRiver would improve this.

So I think the only way you can achieve what you want is to have MadVR do the resolution changing.  The rub is that JRiver has historically advised against this because that capability does not work reliably inside MC.

You can refer to the link Bryan gave you to try and set that up, but I don't use it so I'm not very familiar with it.

rec head:
I have a 2016 LG OLED and madVR scaling is so much better. On some content it doesn't matter but dark scenes are night and day with madVR being a very obvious improvement.

Maybe yours is newer and better.

IAM4UK:
Thanks for the replies. My OLED is also 2016 model (and I use the 3D capability, so it's about the best TV for me...)

I will dig into the madVR options. One other consideration is that even though I use Certified 18Gbps HDMI cables, I see some sparkles if I send 2160p upconverted content from the PC.

Since y'all are obviously well-informed, I'll ask another related question that probably is not an MC thing:  When I watch HDR content via MC, all content I watch after that is played back as if it were HDR, even if it's not. Rebooting the computer is the only way to reset that; simply restarting MC isn't enough. Thoughts?

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