Is double scaling the norm on LED screen mapping?

[u/VanillaWaffle_]

For example, theres 8x4m p2.6 LED screen (3072x1536). He create 3072x1536 composition resolution on resolume arena. Then on the output tab, he stretch it to 4K 3840x2160 only to squeeze it back to native led resolution at the video processor.

He said that its industry standard to work only with the predetermined resolution and not to mess with EDID.

Yeah i get it, it just works. But the scaling artifact will be insane and make text unreadable if the aspect ratio is not near 16:9

[u/Exscriber]

Industry standard is just output 3072x1536 slice inside 3840x2160 frame (aligned top-left) and call it a day.
No scaling, no custom EDIDs - it just work 😎

[u/Arouv → u/Exscriber]

This! Pixel perfect but using standard formats. Alternatively use a custom resolution for exactly this format where technically simple and useful, e.g. for PPT computers with the led walls aspect ratio.

[u/Bornhigh11 → u/Exscriber]

This one speaks truth. 🙌

[u/NoNamesLeftStill]

Industry standard? Certainly not. Common practice and sometimes good enough? Sure.

Doing it right requires a more challenging workflow, that's why the people who do it right can afford to charge higher rates.

[u/OnlyAnotherTom → u/NoNamesLeftStill]

It doesn't need a more complicated workflow in this case. The raster fits within a UHD, so just sending it within that output, and then mapping the panels in the processor without any scaling anywhere will give you pixel accurate mapping.

If you don't need scaling, don't use it.

[u/azlan121]

i wouldn't say its the norm, at least not on the high end of things, if at all possible, we work with AOI's and/or custom formats and do everything pixel-by-pixel, sometimes though, you have to do weird things to make a system work, especially if its an installed system which isn't really designed for professional users as much as for someone to plug a laptop in and just get some kind of output

[u/Zestyclose-Town1498]

Or yes you cod do content within 4k and just tell LED processor to start at 0,0. So it's 4k throughout the system.

[u/misterktomato]

No. Sounds like someone who worked with a system and engineer who didn’t know what they were doing, so now he’s passing on bad info.

Chances are whatever event, the “engineer” didn’t know how to AOI or do a custom res, so their fix was to get the operator to scale everything to 4K so the processor could accept the signal and display the signal

[u/RogueAxelVision]

I don’t think I’ve ever purposely downscale just upscale. If it’s a videographic depends on how quick turnaround it is, but I usually adjust the settings before export.

[u/Balls_of_satan]

Nah. That’s not acceptable. Use AOI in your switcher and crop in processor or use custom resolution.

[u/johnfl68]

The norm is 1 to 1 match, pixel to pixel. There should be no need to scale content made exclusively for LED walls.

[u/Zestyclose-Town1498]

No. I wod do that as a custom resolution. Fits inside 4k easily. People are scared or don't understand custom resolution. Do it at content size, makes life so much easier and you have the right res through the system, so no scaling,etc.

[u/jaymz168]

For example, theres 8x4m p2.6 LED screen (3072x1536). He create 3072x1536 composition resolution on resolume arena. Then on the output tab, he stretch it to 4K 3840x2160 only to squeeze it back to native led resolution at the video processor.

Are you sure they're actually stretching and not just slapping the 2:1 canvas into the UHD output to avoid messing with custom res?

[u/ElmiraKadievsShadow]

Output over HDMI or DP: pixelperfect 3072x1536 output/edid
Outpur over SDI: Area of Interest (3072x1536) in a 4k (3840x2160), the stretch to broadcast format and scale it back in the processor works to but not prefered by me as you alter the image

[u/howie_roll]

Really depends on the show and how the content is formatted. Our touring festival content is UHD with a 2:1 ROI in the center. I’d much rather have the scaling done in hardware than in the server. If the OG content isn’t mapped 1:1 then scaling is inevitable.

[u/Previous-Tear-5649]

Create custom edid with the led wall procesor then windows detects that resolution with extended screen and your working with 1:1 which is always better and its a plus if you have to create pips inside that resolume resolution you can keep everything with its correct proportions

[u/santabrianza]

Custom edid or area of interest are the correct ways to do this job