Replies: 13 comments 15 replies
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Leave it alone for a few minutes – the slower your hardware, the longer it will take. When you first run HyperHDR, a LUT is dynamically created in your home folder. |
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beside webOS requires special LUTs, you can find help here: https://github.com/satgit62/Ultimate-HyperHDR-Ambilight-fine-tuning-experience-for-LG-webOS-with-new-LUT-calibration- or calibrate lut forwarding flatbuffers to PC. |
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Thanks for the guide that i already read i forgot how many times. So i finally have been able to create lut files after trying again again and again and i don't know why it finally worked. Anyway. I compressed it at maximum 17 and put them on the folder. 
HyperHDR still complains he couldn't find it: 2025-07-14T00:59:30.093Z [FLATBUFSERVER] The LUT file is not loaded. A new LUT was requested. It usually takes less than a minute I guess this is the appropriate place for this hyperhdr bug, right ? |
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nope, piccap is handling switching lut tables depending on the mode. beside your luts naming is wrong. from @satgit62 script: |
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on the other hand: https://github.com/satgit62/satgit62.github.io/releases/download/v0.2.0-alpha/lut_compressed.tar.gz |
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Ok i leave don't worry.
It's again mentioned on your own guide https://github.com/awawa-dev/HyperHDR/wiki/lut-calibration where you are saying to specifically keep the name when compressing. Imho some details are missing from both guides and would prevent you from being bothered by people like me if it was present in it. |
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I made a mistake here (not in the guide) because I used a script for Webos that used uncompressed LUTs, but there's also another that uses compressed ones. Webos is a specific system, with Picaap, which uses its own capture engine with undocumented formats (e.g., captured SDR is no longer SDR after being captured by Webos). What I could do, I did by analyzing such frames (e.g., introducing NV12 to HyperHDR), but don't ask me about the nuances of installing on that system – you have a dedicated Discord for that, where the whole PicCap story began and developed. I think that's a fair suggestion. |
Hello, I can only think of the “Instant Game Response” (IGR) or the game mode on LG as a possible source of error. When "Instant Game Response" is enabled on LG TVs, HyperHDR may not be able to load the correct LUT because this feature blocks access to certain picture settings. This is because “Instant Game Response” puts the TV into a special gaming mode that is optimized for low latency and restricts the adjustment of many picture parameters - including PicCap video capture and the associated LUT table. This has been reported and confirmed by owners of LG C9 and CX series devices. When this option is disabled, the NV12 is recognized immediately and the corresponding LUT with the "index 1 for HDR YUV" is loaded correctly. If you have installed the HyperHDR version from my new guide, the compressed and uncompressed LUTs will be installed in the correct directories and the corresponding symlinks will be set. However, I think they have found the cause themselves in the meantime. If not, please let me know. |
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i have a LG G5 rooted with piccap and hyperhdr 22beta version. I've enabled nv12 in piccap. I've also downloaded the LUT in hyperhdr but if i exit and enter again in the hyperhdr app i cann see thtat there is no LUT table associated, so the LEDS are not working at all. I enabled HDR also in the webui of HyperHDR but still not working... If I disable the nv12 in piccap and disable HDR in hyperhdr it starts working fine. Can somebody tell me how to troubleshoot this? |
Hello, 
To do this, you must install the exact version I have provided in this guide. |
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sorry, my explanation was not good, i've followed that guide. The LUT table was downloaded from the hyperhdr loader app as you've told in the previous message and also in the guide.... when i press the compressed or uncomporessed button it says "installed" but if i exit and reenter the loader app is never loaded... i thinkt htat could be the issue why i can't see any Led ON... I was able to isolate one of the issues and if I enable this, all lights go off: 
IF don't enalbe it sometimes they work sometimes both piccap and hdr loader processes seems stopping working... Also i can see that sometimes the piccap process is at 99% cpu, even if i pause the video on the screen.... |
Hello, the compressed LUTs are usually loaded into the 
You can install them either in compressed or uncompressed form. The compressed ones are sufficient. |
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@bone6000 as you didnt provide any details about your led driver so I leave it just like that (the symptom fits): |
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I have this files in that directory I have a WS2812B led strip with a rp2040 and latest hyperserialpico firmware installed. It's connected via usb to the tv. 
This is the options in hyperhdr webui when working fine |
Latest? Which means? Provide logs from HyperHDR when it connects to it (handshake enabled) |
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@bone6000 |
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Correct but I have that configuration now because of I change it to the one mentioned by you (that's also the config in the guide) the Leds have no output... Also would like to remember that is when enabling this option. Without that is working fine... 
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This is the firmware I use in rp2040: https://github.com/awawa-dev/HyperSerialPico/releases/download/v11.0.0/HyperSerialPico_ws2812.uf2 Tomorrow will send logs |
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You still need to enable that (HDR-to-SDR Tone Mapping). And if you need help, just upload a complete HyperHDR log as a text file so we can see what's going on. |
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Hello, I've enabled the logs in debug mode and I can see this message repeating all the time: [FLATBUFSERVER] The NV12 image data size (0) does not match the width and height (0) or it's empty. I attach a video of the config in the TV: https://streamable.com/jm00lv. There you could see that the LUT dissapear after installing... I don't know if its a good behaviour or not Also attach this pictures of the webui of the HyperHDR now (leds not working due to the "Enable RGBW with dithering by Infinite Color Engine" option enabled... 
The log is here: |
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Why did you enable the "Enable RGBW with dithering via Infinite Color Engine" option in the Adalight controller? Your LEDs are RGB-only, not RGBW. |
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becuase it's mentioned in the guide: https://github.com/satgit62/Ultimate-HyperHDR-Ambilight-fine-tuning-experience-for-LG-webOS-with-new-LUT-calibration-#2-hyperhdr-installation-instructions Can you confirm if the other configurations are ok for my environment? Finally, do you know why i have to much errors like this? "The NV12 image data size (0) does not match the width and height (0) or it's empty." Thanks for answering |
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Okay, the tip regarding activation is, of course, aimed at users with SK6812RGBW LEDs. After all, only "RGBW" is specified. I will add a corresponding note to my instructions. I am unable to identify the other error in your HyperHDR log, as the log was captured too late. The data that PicCap sends to HyperHDR appears further up in the log. |
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@bone6000 “The NV12 image data size (0) does not match the width and height (0) or it's empty” means that PicCap/Hyperion-WebOS is sending empty images, which means capturing isn't working. |
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Bug report, debug log and your config file (FULL LOGS ARE MANDATORY)
Steps to reproduce
What is expected?
What is actually happening?
Get an error: The LUT file is not loaded. A new LUT was requested. It usually takes less than a minute
I tried to run lut calibration but Piccap crashes because it's too much heavy to produce 1280x720 screen capture.
System
HyperHDR Server OS:
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