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Old 24th August 2019, 11:25   #57201  |  Link
oldpainlesskodi
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Sorry, clearly I've lost the plot, as there I was thinking we were discussing HDR playback on a 4K TV that would, one way or another, by default have to support 10bit - my bad...
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Old 24th August 2019, 12:07   #57202  |  Link
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The TV supports 10-bit input but of course not with RGB at 60 Hz so you either have to send YCC 4:2:2 10-bit or RGB 8-bit. If you output YCC 4:2:2 obviously you lose chroma precision, but you also risk the graphics driver using lower quality conversion so many people using madVR prefer sending 8-bit RGB even with HDR, but as AMD insists on 10-bit for its HDR API it's the graphics driver that is doing the 10- to 8-bit dithering for output, and it would be better if madVR was doing it.
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Old 24th August 2019, 12:18   #57203  |  Link
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Makes perfect sense, from a technical point, but given all UHD HDR movies are 23p or 24p (apart from a few), why is it an issue? I guess thats what I am failing to understand.
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Last edited by oldpainlesskodi; 24th August 2019 at 12:22.
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Old 24th August 2019, 12:37   #57204  |  Link
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judder issues in TV where 60 hz is better and the movies you have named.

pretty much every Tv performances better with 8 bit then 10 bit.
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Old 24th August 2019, 13:03   #57205  |  Link
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Little help guys. Amd card, oled c8. When I manually switch hdr in win10 (madvr set to choose), everything is ok (pic 1). If i want hdr passthrough by choosing d3d11 10bit, hdr passthrough, display shows hdr tag but blacks are crushed (pic 2). On hdmi front everything is set to full (0-255). Any ideas?

pic1

pic2
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Old 24th August 2019, 13:18   #57206  |  Link
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HDR may invoke a diffrerent preset for HDR, you may not have configured your black level, if your black level is set to "LOW", try changing it to HIGH.
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Old 24th August 2019, 13:45   #57207  |  Link
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Thats the thing. OS HDR works as intended, AMD HDR is crushed. On tv (hdr settings) and gpu its on high, full, also madvr and lan video decoder. Dont know where else to set it.
p.s. Basicly it seems d3d11 is to blame, but dont know what i can do about it.

Last edited by mgermo; 24th August 2019 at 14:23.
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Old 24th August 2019, 16:24   #57208  |  Link
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Quote:
Originally Posted by ryrynz View Post
Overlock your card, reduce chroma settings down, remove any unnecessary prost processing (more than one sharpener, debanding) change some trade quality for performance options.
Madvr needs only memory overclock? Or it needs both core and memory overclock?

Last edited by Siso; 24th August 2019 at 16:48.
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Old 24th August 2019, 18:08   #57209  |  Link
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Both, core is very important but a memory overclock has a big impact too.
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Old 24th August 2019, 18:25   #57210  |  Link
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Both, core is very important but a memory overclock has a big impact too.
Thank you, sir!
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Old 24th August 2019, 18:48   #57211  |  Link
mclingo
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Quote:
Originally Posted by mgermo View Post
Thats the thing. OS HDR works as intended, AMD HDR is crushed. On tv (hdr settings) and gpu its on high, full, also madvr and lan video decoder. Dont know where else to set it.
p.s. Basicly it seems d3d11 is to blame, but dont know what i can do about it.
there are no known black crush issues with AMD HDR with or without d3d11 i am aware of, still think you've got something not set right on your setup.

Mine:

windows - 444 full RGB 8 bit
MADVR - 0-255 / 10 bit / FSE & use DIRECT3D ticked -
LG OLED EF950v TV - black level - high - brightness 50 / gamma 2.2
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Old 24th August 2019, 19:33   #57212  |  Link
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Quote:
Originally Posted by mclingo View Post
there are no known black crush issues with AMD HDR with or without d3d11 i am aware of, still think you've got something not set right on your setup.

Mine:

windows - 444 full RGB 8 bit
MADVR - 0-255 / 10 bit / FSE & use DIRECT3D ticked -
LG OLED EF950v TV - black level - high - brightness 50 / gamma 2.2

He might be using a displayport to Hdmi2.0 converter. These often cause gamma crush on TVs.
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Old 24th August 2019, 19:39   #57213  |  Link
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Quote:
Originally Posted by mclingo View Post
there are no known black crush issues with AMD HDR with or without d3d11 i am aware of, still think you've got something not set right on your setup.

Mine:

windows - 444 full RGB 8 bit
MADVR - 0-255 / 10 bit / FSE & use DIRECT3D ticked -
LG OLED EF950v TV - black level - high - brightness 50 / gamma 2.2
Shouldn't you have madVR set to 8bit matching your other 8bit config?
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Old 24th August 2019, 20:19   #57214  |  Link
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I have same settings. Windows default is 12bit, changed to 8bit for testing, no difference.
Discovered that you dont need to have hdr passthrough enabled, even if you have it on let madvr decide it decides on hdr mode (if you have d3d). And you dont need 10bit, if you put it on auto it goes to 10bit anyway. Unfortunately picture ramains way too dark aka i cant see anything (probably more than just black crush). If you need any more info...
p.s. Before I was on old 19.2 drivers, updated to new 19.8.1, same difference.
p.s.2. No hdmi-displayport converters
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Old 24th August 2019, 20:23   #57215  |  Link
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Quote:
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Shouldn't you have madVR set to 8bit matching your other 8bit config?
With AMD you have to send it 10 bit data or you cannot enable HDR. It is less than ideal.
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Old 24th August 2019, 21:44   #57216  |  Link
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Quote:
Originally Posted by skydreamer888 View Post

It is possible to implement an automatic switch of combinations of resolution, refresh rate, bit depth and color format in madVR?
I asked this a long time ago. Answer is no to bit depth and color format, I'm sure nothing has changed since.
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Old 24th August 2019, 23:36   #57217  |  Link
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So my 5700 went back to Best Buy today. I'm using my RX 560 until the non-reference 5700 XT's become available. I just got a new receiver and I'm having issues passing through 4k @ 60Hz, so I've got that mess to keep me busy until then.
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Old 25th August 2019, 05:22   #57218  |  Link
tp4tissue
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Quote:
Originally Posted by mgermo View Post
I have same settings. Windows default is 12bit, changed to 8bit for testing, no difference.
Discovered that you dont need to have hdr passthrough enabled, even if you have it on let madvr decide it decides on hdr mode (if you have d3d). And you dont need 10bit, if you put it on auto it goes to 10bit anyway. Unfortunately picture ramains way too dark aka i cant see anything (probably more than just black crush). If you need any more info...
p.s. Before I was on old 19.2 drivers, updated to new 19.8.1, same difference.
p.s.2. No hdmi-displayport converters
what tv is this.
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Old 25th August 2019, 05:23   #57219  |  Link
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Originally Posted by ryrynz View Post
I asked this a long time ago. Answer is no to bit depth and color format, I'm sure nothing has changed since.
Gave up on all'o'dat auto switch nonsense. I just built a dedicated madvr box,

12bit 23.976hz 444 no more fiddling.

It's just easier.
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Old 25th August 2019, 08:35   #57220  |  Link
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what tv is this.
LG c8 oled
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