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21st August 2019, 03:14 | #161 | Link |
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They won't. They're using the latest release build of madvr which has had ALL KINDS of fixes in the betas. So the fact that it doesn't match doesn't surprise me now that j82k is using the latest beta.
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21st August 2019, 03:17 | #162 | Link |
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I don't have a clue about AMD cards. Do they maybe have similar metadata problems as nvidia had in the past? 696 was the number one would always get with the 1000 nits bogus metadata or windows HDR.
I wasn't using the test builds and still got it to work. edit: I can set the target peak nits up to 760 in madVR while keeping the "669" value, at 770 target peak it switches to "696". So 760 target peak nits might be a good value to use for people whose C8 can reach that as I assume that is the point up to where the TV will do no or the least amount of tone mapping. The fastest way to make the metadata change happen is to disable/enable 'output video in HDR format', so no need to restart the player like I did earlier. Last edited by j82k; 21st August 2019 at 03:42. |
21st August 2019, 04:15 | #163 | Link |
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AMD cards use the windows hdr which probably does still send fake metadata at 1000.
That's awesome about the max target nit. I can't wait to play this weekend! Also I really want to thank you for all this awesome information!! This has been a great learning experience for me and I truly appreciate it! Sent from my SM-G975U using Tapatalk
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21st August 2019, 04:45 | #164 | Link |
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I have also been testing madVR (latest beta) on my LG C8 and obtain similar results.
With dynamic target nits, using 10 000 nits as a maximal target causes clipping when the target peak nits are automatically set to 1000+. I've ended up using 750 peak and maximal target nits to avoid clipping. Even using 800 as maximal target has some clipping. Last edited by quietvoid; 21st August 2019 at 04:49. |
21st August 2019, 12:11 | #166 | Link |
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Hmm I could have sworn there was a discussion about the fact that HDR mode on nvidia had a slight advantage over amd due to the nvidia HDR api vs amd using the windows os HDR. I readily admit I could be 100% wrong though.
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21st August 2019, 12:14 | #167 | Link | |
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In what window size? 2/5/10/20% ... ?
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21st August 2019, 14:18 | #168 | Link |
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I guess that is up to you what window size to use and if you want to account for some ABL by using a larger one or not. I haven't given this much thought and usually use a 5-8% window when measuring peak brightness. I think the way ABL works is that it just evenly dims the whole picture so it shouldn't cause any clipping in highlight but I'm really not sure on this.
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21st August 2019, 17:21 | #169 | Link |
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I just went back to the good and old 385.28 nvidia driver and guess what....
Metadata changes happen instantly now! I can change madVR's "HDR target peak nits" value and see the C8s second last WB value change immediatley while the movie is playing. So the metadata change happens on the fly without me having to disable/enable HDR. This is also how I remembered things and is the reason why I was confused and thought madVR didn't change the metadata. Again just an Nvidia driver problem... I think all the newer Nvidia drivers behave like this, meaning metadata change requires retriggering of the HDR signal whereas with 385.28 it just happens on the fly... |
21st August 2019, 23:47 | #171 | Link | |
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22nd August 2019, 09:43 | #172 | Link | |||
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And indeed, everything applies immediately. @Manni: a huge thanks to you for your endless driver testing and finding the one (!) that is the best for Pascal cards!!! Quote:
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705 : passthrough 4000 705 : pixelshader 2501 - 10000 692 : passthrough 1000 692 : pixelshader 761 - 2500 669 : pixelshader 100 - 760 So, what does it mean exactly? - there are slightly different code values on B8 and C8 (I assume due to the max brightness difference) - the same 760 nits value can be applied in B8 as well!!! (the above mentioned brightness difference doesn't matter) - I checked and 760 nits value looks the best (vs 500 / 2000 / etc.), I haven't compared to passthrough yet
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22nd August 2019, 13:26 | #173 | Link | |
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Also, on a different subject, does using Smooth Motion in madVR improve 24fps material playback with regard to motion resolution? Theoretically the frames updating on the screen would be 120 and not 24, which should make things better for a sample and hold display. And with 120 frames to work with, blurring should be minimal, right? |
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22nd August 2019, 16:18 | #175 | Link | |
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Sent from my SM-G975U using Tapatalk
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HTPC: Windows 11, AMD 5900X, RTX 3080, Pioneer Elite VSX-LX303, LG G2 77" OLED Last edited by SamuriHL; 22nd August 2019 at 16:21. |
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22nd August 2019, 16:32 | #176 | Link | ||
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Found another really strange behavior of the C8 using the HDR color clipping test pattern from here:
https://drive.google.com/drive/folde...DUewbFsSXY1r8p There is a big difference of clipping points with certain colors depending on the color format output. It's especially noticeable with red and green. I used passthrough HDR and levels were of course set correctly. Red: RGB full/limited - clips at ~590 YCbCr 444/422 - clips at ~820 Green: RGB full/limited - clips at ~780 YCbCr 444/422 - clips at ~590 With other colors the difference wasn't that big but what's really strange is that red clips much earlier with RGB output but with green it's the opposite, it clips much earlier with YCbCr. These big differences can't be minor color conversion rounding errors right? Anyone able to confirm or explain this?? Quote:
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I assumed a different WB value shown means that the TV uses a different tone mapping curve but I could be wrong. Looking at HDR white clipping pattern I can't detect a change when going from 760 to 761 in madVR even though that causes the TV to show a different WB value. |
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22nd August 2019, 16:35 | #177 | Link | |
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I'll upload some selected clips later for those who wants to compare the result with pure passthrough (+ DTM).
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22nd August 2019, 19:09 | #180 | Link | ||||
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- in your example: 23p -> you're right - but the guys are experimenting in 60p (!) -> blending Quote:
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I also can't notice the difference between 760 and 761 (maybe with the test clips below).
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