Devices > Video Cards, Monitors, Televisions, and Projectors
MadVR banding
MediaMongrel:
--- Quote from: jmone on January 30, 2021, 07:32:16 pm ---I have no idea about the "Startech DP-to-HDMI adapter" or any issues that may introduce, does the laptop not have a HDMI port?
--- End quote ---
The laptop does have HDMI, but it's just HDMI 1.4b... hence my need to use the DisplayPort 1.4 for outputting UHD with HDR.
The Startech DP 1.4 to HDMI adapter is CDP2HD4K60H... and info can be found here:
https://www.cdw.ca/product/startech.com-usb-c-to-hdmi-adapter-hdr-4k-60hz-usb-c-to-hdmi-converter/5456613?pfm=srh
This may be a useful accessory for some other folks out there.
If it helps the conversation, my exact Lenovo Thinkbook 15 G2 (gen 2) ITL (Intel) model is 20VE006UUS. Specs can be found here:
https://psref.lenovo.com/Detail/ThinkBook/ThinkBook_15_G2_ITL?M=20VE006UUS
wer:
Comparisons to PowerDVD and VLC aren't germane to diagnosing MadVR configuration issues, because they don't use MadVR.
Download MPC-HC, and configure it to use its own copy of MadVR. If that does work, then there's something to be worked out with your JRiver/MadVR configuration.
If that doesn't work, you either have an issue due to your driver or Startech adapter, or it's a MadVR problem that will require madshi to address it.
MediaMongrel:
Okay... so i went back and put all my MadVR settings as you suggested, Jmone... and the banding was as bad as it has ever been.
Then I went and turned HDR off in Windows Display setting, as you suggested, Tij. Well... right there, all banding in JRiver disappeared... great image quality! Also, when playing both SDR and HDR content, they initially looked as I might expect they would (HDR was not dull and greyed-over). However, I wasn't getting the HDR logo popping up in the corner of my LG CX tv, as it normally does when it detects HDR content, so I investigated and noticed a few issues.
Apparently, as soon as I turn off HDR in Windows Display settings, for the external monitor (tv), it automatically limits it to SDR '8bit'. Even if I tell MadVR that the tv device is capable of 10bit native display bitdepth... my tv shows that it is still receiving just 8bit (after i do an Easter egg button combo to bring up a special window showing incoming signal info). No MadVR setting I tried could force a 10bit signal out when Windows Display setting for the device was limited to SDR 8-bit. Tried letting MadVr decide, passthrough HDR to display, and tone map HDR using pixel shaders.
The next issue I discovered, after turning off HDR in Windows Display, was that the HDR-like-but-Non-HDR signal I was seeing on my tv seemed somewhat brighter in the scene(s) I was using as reference (Hobbit - Desolation of Smaug). It still had perfect blacks... but the highlights seemed brighter. I opened up a couple HDR anime movies I'd also been using as reference (Akira, and Weathering You) and saw that their highlights were likewise up'd... but it was totally washed out in the case of Weathering You! Like, WAY washed out, as you can see in the attached jpg... also showing MadVR render stats (Ctrl J) and Windows Display output.
Sooo.... looks like a case of one step forward, two steps back. lol
tij:
on HDR (including HDR logo pop up on TVs) see https://yabb.jriver.com/interact/index.php/topic,126153.0.html
EDIT: also strange ... MadVR is downscaling 4K ... is your TV a true 4K TV ... what is your Desktop scaling (DPI)?
MediaMongrel:
Okay, an update!
So, with HDR off in Windows settings, as before... in MadVR tv device, i tried 'passthrough HDR to display' but unchecked 'send HDR metadata to the display'. Voila - the dull grey'd out video i would expect from HDR content played on an SDR screen. Then...
I tried for the 1st time, 'tone map HDR using pixel shaders' with 'output video in HDR format' box checked. Same overly bright problem as before. But then...
I tried 'tone map HDR using pixel shaders' and UNchecked the box 'output video in HDR format'. Okay... this one I'm not too sure what is happening under the hood. I think my TV would probably do the best job of decoding HDR data... it's kind of weird if MadTV is trying to process HDR and apply it to RGB values PRIOR to sending it to my tv... not knowing what's really going on makes me suspicious, BUT... the image shows NO banding, and NO blown out highlights. It looks just like i was previously watching in VLC or PowerDVD.
However, my tv still doesn't show a popup HDR content logo, and it's incoming stream still shows it is an 8-bit signal its receiving. If I'm not mistaken, that means, even if I get a darn good image, HDR or not... I'm seeing a reduced colour spectrum than what the original content was (yes, 10bit encoded .mkv file). Hmmm...
Anyways, here is another screen grab showing MadVR stats (Ctrl J) and Windows Display.
Any comments/insights regarding the recent stats... 8bit vs 10bit... HDR logo popups on tvs... and 'tone map HDR using pixel shaders' without 'output video in HDR format'?
Sorry tij, I just noticed ur link between this and my last post... haven't read it just yet, but will shortly. Thanks!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version