madVR - high quality video renderer (GPU assisted)

[Asmodian]

It works for me.

madVR v0.92.17
Win 11 22000.282
NVIDIA 496.13 DCH

[zveroboy]

it`s strange...
maybe cos of .282 ?

[Asmodian]

Check for updates? I did get an update yesterday.

[zveroboy]

I will update next week (as I guess) and post result here.

[Rippner]

Originally Posted by zveroboy

madVR can`t switch the display modes.
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madVR 141
Win 11 22000.258
NVIDIA ForceWare 496.13 DCH

same problem! also, no hdr switch
madVR v0.92.17
Win 11 22000.282
NVIDIA 496.13 DCH

[ashlar42]

Envy starting to get interesting feature absent from madVR. The 1D Lut thing is something I'd be happy to pay for madshi in order for it to be added to madVR, if you'll ever read this.

[zveroboy]

Originally Posted by Rippner

same problem! also, no hdr switch
madVR v0.92.17
Win 11 22000.282
NVIDIA 496.13 DCH

is the StartAllBack installed?

[zveroboy]

Originally Posted by Rippner

same problem!

I meant switching the refresh rates (23Hz, 24Hz, 50Hz, 59Hz, 60Hz).
We're talking about the same thing, I hope?

[Asmodian]

I meant refresh rates as well.

But HDR switching does work for me too, as long as I make the video fullscreen.

[Rippner]

Originally Posted by zveroboy

is the StartAllBack installed?

nope

Originally Posted by zveroboy

I meant switching the refresh rates (23Hz, 24Hz, 50Hz, 59Hz, 60Hz).
We're talking about the same thing, I hope?

yes refresh rate

[zveroboy]

Asmodian
Rippner

2-monitors config (extended display mode) ?

[Rippner]

Originally Posted by zveroboy

Asmodian
Rippner

2-monitors config (extended display mode) ?

show only on 1
I use my aoc 24 for daily use and lg cx for movies

[zveroboy]

Rippner
Hmm...
It seems the issue at madVR side.

[Asmodian]

Originally Posted by zveroboy

2-monitors config (extended display mode) ?

No, only one display (LG CX).

[flossy_cake]

Originally Posted by ashlar42

I've found this useful, can't promise the same for you, but have a look: https://www.extron.com/product/videotools.aspx

You can select both PC (VESA) timings and HDMI (SMTPE) timings. If you use the advanced tab, you have all the details and work it out from there.

Thanks. According to that website it appears that:

SMPTE/CTA/DCI = "Automatic (HDTV)" in CRU = what I referred to as "TV mode"
VESA = "CVT standard" in CRU = what I referred to as "PC mode"

Unfortunately I cannot use PC mode timings otherwise my TV uses different, unsatisfactory video processing and locks out a lot of the picture controls, and no 24/50hz modes either.

So I am stuck with TV mode timings which appear limited to +/-0.003hz from the spec. I am not sure if this is my display's fault or the GPU driver not allowing it.

This is not a huge problem as the worst case scenario is Ctrl+J reporting a repeated frame every 2 hours, which means at most a dropped frame for a movie.

By the way, is it possible to map the Ctrl+J debug screen to a mouse button, such as middle click, or double click right mouse button? I'm just using a mouse only for HTPC operation in the lounge room, and I don't want the burden of a keyboard. MadVR's keyboard shortcuts section only seems to allow key combinations, whereas MPC-HC allows mouse clicks, but they can't be mapped to MadVRs Ctrl+J debug screen, only "OSD: display renderer statistics" which is a different, unrelated screen.
________________________________________________________

On a separate note, I'm having trouble understanding why HDR is so much more system intensive than SDR -- can anyone shed some light on this?

For example I have this Peru8k clip which is 4k60 in SDR. It plays flawlessly without any dropped frames on my i5-4570 + R9 380 system.

But 4k60 HDR clips are not playable -- my system struggles to render frames very slowly with constant pausing and breaks in audio. CPU is pegged at around 70% so doesn't seem to be a CPU issue -- maybe memory bandwidth issue? GPU is doing very little, some bursts of 50% usage every now and then, but mostly at 0% -- I presume this means it's not doing hardware decoding and everything is being done by CPU -- consistent with R9 380 being an old card that wouldn't be capable of HEVC decoding presumably. On my GTX 1070 system, GPU usage is pegged at 50% so I'm assuming that's the GPU's HEVC decoding taking a large portion of the load, and I get smooth playback.

Is 4k60 HDR really that much more system intensive than 4k60 SDR? I can't imagine it being that much more intensive, with maybe some higher bit depth render targets and an additional tonemap pass for the HDR to SDR conversion. Surely that can't be the difference between perfect playback and being totally unplayable?

[Asmodian]

Originally Posted by flossy_cake

Is 4k60 HDR really that much more system intensive than 4k60 SDR? I can't imagine it being that much more intensive, with maybe some higher bit depth render targets and an additional tonemap pass for the HDR to SDR conversion. Surely that can't be the difference between perfect playback and being totally unplayable?

Yes, that tone mapping can be VERY intensive. Adjust HDR tone mapping options to improve performance or turn off tone mapping to see how much impact it has.

[flossy_cake]

Originally Posted by Asmodian

Yes, that tone mapping can be VERY intensive. Adjust HDR tone mapping options to improve performance or turn off tone mapping to see how much impact it has.

Thanks, I've tried just now turning off HDR tone mapping in MadVR ("passthrough hdr to display"). This results in the expected "washed out" image when presented as SDR at the display. I observe no effect on performance on my system (i5-4570 + R9 380).

I've dabbled a bit with 2D pixel shaders in ReShade, and this seems like it wouldn't be particularly GPU intensive. It should only be a few lines of shader code at most, and the GPU has lots of cores to do it all in parallel to every pixel. In ReShade I'm seeing around 1-3% increase in GPU load from applying various tonemap shaders. However some tonemap shaders are much more GPU expensive so I guess the devil is in the details.

My GPU usage during playback is a bit curious:

[Asmodian]

That means you cannot decode the video fast enough. Is one HEVC and one AVC? You can probably use hardware decoding for the SDR one, but cannot for the HDR one. Look at CPU usage for both files.

[flossy_cake]

Originally Posted by Asmodian

That means you cannot decode the video fast enough. Is one HEVC and one AVC? You can probably use hardware decoding for the SDR one, but cannot for the HDR one. Look at CPU usage for both files.

Peru 4k60 SDR clip
VP9, 24mbps, CPU 65%, GPU 0% but occasionally spiking to 100%

LG 4k60 HDR clip
HEVC, 60mbps, CPU 70%, GPU 0% but occasionally spiking to 50%

I guess it's to do with VP9 vs HEVC and the bit rate?

And I suppose the fluctuating GPU usage means it's NOT doing hardware decoding, since on my other PC which uses a GTX 1070 -- which supports HEVC & VP9 -- the GPU usage is pegged at a constant 50% during playback.

[goldfield]

Originally Posted by flossy_cake

Thanks. According to that website it appears that:

But 4k60 HDR clips are not playable -- my system struggles to render frames very slowly with constant pausing and breaks in audio. CPU is pegged at around 70% so doesn't seem to be a CPU issue -- maybe memory bandwidth issue? GPU is doing very little, some bursts of 50% usage every now and then, but mostly at 0% -- I presume this means it's not doing hardware decoding and everything is being done by CPU

I don't know that much about the technology.
But for a long time I also had the problem, up to 4K / 60Hz everything ran smoothly, but 4K / 60Hz even had severe problems.

After a hint in the German Hifi-Forum I switched from D3D11 (copyback) to D3D11 (native) in the LAV-Filters under "Hardware device to use", and that means that 4K / 60Hz works fine for me.

Maybe it will solve the problem for you too.

But it is well known that deinterlacing and black bar detection do not work with D3D11 (native).