Latency on my Flanders monitor fed by UltraStudio 4K Mini?

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jeremyratzlaff

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Latency on my Flanders monitor fed by UltraStudio 4K Mini?

PostMon Jan 13, 2025 3:59 pm

I have had my colour grading suite set up for over a year now, and I've always dealt with this latency issue on my UltraStudio 4K Mini SDI-fed Flanders Scientific DM220 reference monitor. It is several frames behind the Resolve playback on my GUI monitors, whioch is always incredibly distracting to clients when they are sitting in with me.

Is there a way to fix this?

I have already looked at my preferences, and in my "Video and Audio I/O" the "Audio monitoring delay" has already been set to 0. I already tried that when I first set everything up. What else could be causing this latency issue?

edit: I am on a Macbook Pro w/ M2 Max.
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Uli Plank

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostTue Jan 14, 2025 1:14 am

You may get more exposure in the "Resolve" subforum.
My disaster protection: export a .drp file to a physically separated storage regularly.

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jeremyratzlaff

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostTue Jan 14, 2025 5:50 am

Uli Plank wrote:You may get more exposure in the "Resolve" subforum.

Thank you - will do!
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Andy Mees

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostWed Jan 15, 2025 12:12 am

In Resolve's User Preferences, maybe try adjusting the Fairlight >> Video monitor offset control.
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Luis_X

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostWed Jan 15, 2025 4:47 am

Well reading your post I thought I would check to see if I had any delay. I have a Mac connected to an FSI looping to LG OLED. The LG has a 6g SDI-HDMI converter. The signal is 4-4-4 RGB.

I used my phone to record all three to see if there was any delay which I have never noticed. So I shot the GUI, the Flanders and the LG all in the same frame.

And the results are weird. On an edit the LG shows the cut first, the next frame is the GUI showing the cut, and the next frame is the Flanders showing the cut. So over three frames (at 30fps) the first to show the cut is the OLED at the end of the signal chain!!!

This is pretty much imperceptible since I have never noticed it, but the results are odd.

If you are getting a bigger delay, maybe check to see if you have any processing going on on the Flanders. Mine has a Noise Reduction setting that says "Faster" whatever that is. I never use NR on that panel.

PS - as a bonus the phone revealed a color shift in the OLED. Though to my eye it looks a spot on match to the Flanders. Time for a re-calibration. But now I have a nifty tool in my pocket to check display matching.
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mpetech

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostWed Jan 15, 2025 4:57 pm

Luis_X wrote:PS - as a bonus the phone revealed a color shift in the OLED. Though to my eye it looks a spot on match to the Flanders. Time for a re-calibration. But now I have a nifty tool in my pocket to check display matching.


What app is this? Is your phone calibrated to do calibration?
I never had the luck with smartphones being dependable for video calibration.
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Uli Plank

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostThu Jan 16, 2025 12:35 am

Yes, sometimes a camera can reveal things the eye doesn't see so clearly.
Which phone is it? An iPhone? If so, which settings?
My disaster protection: export a .drp file to a physically separated storage regularly.

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MacBook M1 Pro, 16 GPU cores, 32 GB RAM, MacOS 14.7.2
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Marc Wielage

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostFri Jan 17, 2025 5:16 am

We generally run our LG OLEDs in "Video Game Mode," which is less than 40ms. I find that's fine for most applications (it's about 1 frame at 24fps), and we can easily compensate that with the user prefs in Resolve.

I tell clients to disregard the GUI monitors and only watch the main calibrated color monitor. My standard line is, "that's the only thing that will tell you the truth."

I can't speak to what the latency is on Flanders monitors, but I think this is an "it is what it is" situation and the client is just going to have to live with it. As long as sound is in sync with picture, there is no real problem.
Certified DaVinci Resolve Color Trainer • AdvancedColorTraining.com
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Andrew Kolakowski

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostMon Jan 20, 2025 5:26 pm

Flanders should be <1 frame as this is standard for pro monitors.
Your result is rather very strange.
Is it on PC with 1 GPU ?
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Luis_X

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostThu Jan 23, 2025 9:29 pm

I had the monitor connected to a MacPro. But just plugged up M1 macbook pro with a newer version of Desktop Video just to eliminate that. There is about a two frame latency with all flavors of signals both SDI and HDMI. I installed an additional little scopes monitor in the signal chain and neither it nor the OLED had any latency, while the FSI did. I also tried a direct feed using Resolve's Clean Feed with the other monitors still on SDI, still about two frame latency.

This seems odd but I have learned it is normal as this is an older LCD panel running Flanders Color Fidelity Engine version 1. I saw an older post from the head of FSI USA saying it is normal and that if you want to speed things up try the Fast setting. I tried that but from what I can tell it only sped image rendering up about a half a frame.

Anyway, that is to answer questions. I personally am not concerned and am happy as things are.

As far as the phone shooting the screen and seeing color differences. I shot using an iPhoneSE with both the default iOS app and the BMD camera app. Can see difference in white point, bigger difference than my old tired eyes can discern. Both panels read 6500k white on a colorimeter, but without custom spectral correction. I'm no color scientist but I think some of it has to do with metameric differences between different panel technologies. Take a look at two screens through your phone at your own risk!
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Andrew Kolakowski

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostThu Jan 23, 2025 9:32 pm

If monitor is "slow" then not much you can do. Typically pro monitors are <1 frame of latency.
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Uli Plank

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Re: Latency on my Flanders monitor fed by UltraStudio 4K Min

PostThu Jan 23, 2025 11:36 pm

I tend to blame metamerism too.
Point different cameras at different screens (or fluorescent colors) and you’ll be surprised.
My disaster protection: export a .drp file to a physically separated storage regularly.

Studio 19.1.3
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MacBook M1 Pro, 16 GPU cores, 32 GB RAM, MacOS 14.7.2
SE, USM G3

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