madVR Options Explained

[StrifeLeonhart]

Originally Posted by JNW

Not exactly what you wanted but best you could do would be to use software decoding. That will use your CPU instead of GPU.

My friend that is exactly what I was trying to explain to Asmodian, that is exactly what I wanted to do, thank you so much for saying what I wanted to say but didn't know how.

I don't mind about adding more work for the CPU, I'm just trying to make the CPU take the work load instead of the GPU.

Now I would like to ask Asmodian, which options would I need to go through the "MaxQuality" settings to use Software decoding.

[huhn]

you should stop ignoring him and understand that this will cost you GPU power...

[Asmodian]

Originally Posted by StrifeLeonhart

I don't mind about adding more work for the CPU, I'm just trying to make the CPU take the work load instead of the GPU.

Using software decoding does not make the CPU take the workload instead of the GPU. It makes the CPU do a lot more work, while also making the GPU do more work.

I know it is counterintuitive, it seems like the CPU doing a lot more work would mean the GPU has less to do, but the way hardware decoding works on modern GPUs means that madVR has the most GPU power available when using native hardware decoding. The GPU has extra fixed function hardware that does the decoding directly into GPU memory which takes less GPU power than copying the data from system memory.

There are reasons to use software decoding but moving workload from the GPU to the CPU is not one of them.

Originally Posted by StrifeLeonhart

Now I would like to ask Asmodian, which options would I need to go through the "MaxQuality" settings to use Software decoding.

You do not change anything in madVR, hardware v.s. software decoding is an option in LAV Video.

[alexnt]

Is it correct to use
1080p23, 1080p24, 1080p60, 1080p120, 2560x1440p23, 2560x1440p24, 2560x1440p60, 2560x1440p120
under "list all display modes madvr may switch to" ?

My monitor is 1440p@144 but I use it @120Hz
The content I watch on this monitor is mostly 23.976 & 24 fps.

[huhn]

you sadly have to check the refreshrates manual 144 and 240 are usually 143 and 239 so a muliply of 23 refreshrate.

looking at all the modes provided maybe enough.
2560x1440p120 and 2560x1440p144

you can skip 144.

why would you ever want to switch to 1080?

[alexnt]

Originally Posted by huhn

you sadly have to check the refreshrates manual 144 and 240 are usually 143 and 239 so a muliply of 23 refreshrate.

looking at all the modes provided maybe enough.
2560x1440p120 and 2560x1440p144

you can skip 144.

why would you ever want to switch to 1080?

Thanks for the reply!
Because movies are 1080 but as I understand from what you said this not a correct assumption.

I'll stick with 2560x1440p120

[JNW]

Originally Posted by Asmodian

Using software decoding does not make the CPU take the workload instead of the GPU. It makes the CPU do a lot more work, while also making the GPU do more work. Verified with task manager.

I know it is counterintuitive, it seems like the CPU doing a lot more work would mean the GPU has less to do, but the way hardware decoding works on modern GPUs means that madVR has the most GPU power available when using native hardware decoding. The GPU has extra fixed function hardware that does the decoding directly into GPU memory which takes less GPU power than copying the data from system memory.

There are reasons to use software decoding but moving workload from the GPU to the CPU is not one of them.



You do not change anything in madVR, hardware v.s. software decoding is an option in LAV Video.

I'd never argue with you but not how it works on an Intel 11th Gen XE. Get better performance dropping to software. Depends on GPU most likely. Verified task manager. Same madVR, mpv.


EDIT: Merry Christmas Doom9

[Klaus1189]

So what GPU do you use?

[Asmodian]

Originally Posted by JNW

Get better performance dropping to software.

I am curious how you measured "better performance" along with which GPU you are using. Are you comparing to DXVA2 or D3D11, copyback or native?

Do you get lower GPU power draw when running software decoding?

The point I was arguing against with was the idea that you can free up GPU resources by using software decoding. Unless your GPU is pretty old, e.g. using a hybrid decoder, software decoding does not free up GPU resources. It actually uses more GPU resources due to the increased data transfer over the PCIe bus. This is usually a very minor effect with higher end GPUs; however, it is counter intuitive if you expect the CPU to have taken a lot of work from the GPU.

Sometimes you do get better performance overall with software decoding. This is because the GPU switches to a higher power (higher clock speed) mode due to the increased workload, which actually runs madVR better. The drivers don't seem to be that good at picking power levels for madVR's workload. I suggest using a mode other than "Optimal power" for Nvidia GPUs, unless power usage is very important to you.

[zamadatix]

Thanks for this thread, it helped me get IVTC working because I did not realize it would be broken with DXVA or D3D11 decoding (which is default in a lot of cases).

For those on MPC-BE you can configure this under View -> Options -> Internal Filters -> Video Decoders -> Video decoder configuration. In that window you'll find a "Hardware Acceleration" area. In my case, simply switching it to NVDEC works since I have an Nvidia GPU.

[TheGameMaster]

Maybe someone here can help. My MadVr is stuck on super-xbr for doubling. I want to continue to use NGU-Anti Alias. But no mater what I set MadVr to, it still runs super-xbr. I am using the 169 beta release on an HDR system. I did a complete re-install with no change. Any ideas?

[huhn]

you are mixing up chroma with luma?

[TheGameMaster]

I set it to NGU Anti-Alias and it's wont' switch to it. Chroma upscaling is set to NGU Anti-Alias Low. I have had it set to Very High luma doubling, and medium luma quadrupling, and high chroma for years. But after this update, it switched, on it's own, to super-xbr when you do a ctrl-J to view it. Unless you do not double, regardless of setting in MadVR settings, it only uses super -xbr for doubling. Very annoying. I want it to work like it did. I did a complete re-install and went back to an older version of MadVR and no change, and that included deleting the setting.bin and the madvr reg settings in windows 11. It's really strange.

[Asmodian]

Can you post a screenshot of your settings pages?

[TheGameMaster]

Here are the two screen shots. The control-j and the upscale page. As you can see, it is set to NGU-Antialias in settings. But in control-J it shows super-xbr. I have uninstalled, cleared the registery, and reinstalled. Same issue. I even tried going back to an earlier version of MPC-BE and MadVR to see if that would fix it. But no luck.

[TheGameMaster]

The OS I was on was Windows 11 Pro 22H2 Beta channel. I upgraded to 23H2 Canary channel (in order to force the upgrade I had to switch channels). Post-upgrade, MadVR is now behaving normally again. It is no longer stuck on super-xbr. That said, forcing me to use super-xbr did open my eyes to how useful that code set can be. It does run a lot cooler with less dropped frames than NGU-Anti-Alias with my set up. I'm running two GPUs - Radeon RX 5700XT and a still supported Nivida GTX 750ti - on a Aurus 570 Master board and Ryzen 3900 12 core CPU with 64 gigs of RAM. I use the 750ti as my audio card and hardware video decoder (CUVID - in LAV Video with hardware deinterlaceing). It frees up the 5700XT to do the rendering and presentation. Anyway, it works now.

[huhn]

hardware decoding is actually "free".
the real cost is the upload of the decode data which is gigantic with a copyback decoder like cuvid a native decoder could be cheaper.

what so ever a 5700 xt doesn't really care i speak out of experience with it.

[Charky]

Originally Posted by TheGameMaster

I'm running two GPUs - Radeon RX 5700XT and a still supported Nivida GTX 750ti - on a Aurus 570 Master board and Ryzen 3900 12 core CPU with 64 gigs of RAM. I use the 750ti as my audio card and hardware video decoder (CUVID - in LAV Video with hardware deinterlaceing). It frees up the 5700XT to do the rendering and presentation. Anyway, it works now.

Seems like an unnecessarily complicated setup.

EDIT : well, huhn beat me to it

[mark0077]

Just regarding this option

"calibration [disable calibration controls for this display]"

the guide mentions that if its set to disable calibration, that madVR defaults to assuming the TV is using REC 709. Is this still true though if the content is HDR and madVR is outputting in one of its HDR modes (like passthrough or pixel shader mode)j, or does madVR instead assume BT. 2020 in such cases?

[huhn]

in HDR output it will assume bt 2020 and PQ this also counts when output in HDR format is check in pixel shader else with pixel shader it will assume bt 709 and gamma 2.2.