Devices > Video Cards, Monitors, Televisions, and Projectors

When Windows display scaling is above 100%, MC downscales video

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fitbrit:
I have my custom display modes to always play at 3840x2160 on the HTPC. However, for readability purposes we have the Windows display scaling set to 175% in the living room. When I look at MadVR stats, or the Zoom setting in the OSD, I see that MC is downscaling the image to 57%. This is obviously to compensate for the 175% Windows scaling. But is MC really downscaling and then letting Windows upscale, even when the native resolution of the video is 3840x2160p? Or is it just that this is what the software has to report, and the image I am seeing is untouched?

I don't seem to recall this always happening. I seem to recall that video would play (and report in MadVR) that it was playing at 3840x2160 regardless of the Windows scaling setting. But then again I seem to remember lots of things that didn't ever happen and forget those that did!
Happy to provide further information if needed.

tij:
It was always like this ... MadVR will upscale by DPI setting (in your case by 175%) ... you can see this in MadVR OSD

Then something else (MC? ... Windows?) downscales befire output.

I dont think its just software reporting ... image is defenitely being scaled by MadVR - GPU utilization goes up by a lot.

This has been discussed before ... but most ppl say modern GPU is powerful enough to do this ... as i have walk around for this, i did not press on the issue ... at the time it was more important for me to get SSA/ASS subtitles implemented ... which it was :)

EDIT: not sure if this is jyst MC ... or other players using MadVR (MPCHC or VLC) are doing this too ... as i had no time to test

EDIT2: this might also be reason Theatre View is experiencing high GPU use for some users

On my system (nvidia 1070... with DPI bypassed for MC)  ... 2160p23 Theatre View is nornally using around 8% of gpu ... on 2160p60 use is around 9% ... in both cases ocassionally hitting around 24% use

EDIT3: tried turning off my DPI bypass for MC ... funny thing happens ... at 175% DPI , MadVR does not scale ... at 125% DPI, MadVR scales ... some funky logic here ... GPU dependant? ... driver dependant? ... MC dependant?

fitbrit:
Thanks Tij

I think you have it backwards. According to MadVR and MC OSD, MadVR is downscaling the image and Windows is then upscaling it. Thanks for confirming that this is going on.

My second comment for you is a question - how did you bypass MC from the Windows DPI settings?

tij:

--- Quote from: fitbrit on March 04, 2021, 11:58:29 pm ---Thanks Tij

I think you have it backwards. According to MadVR and MC OSD, MadVR is downscaling the image and Windows is then upscaling it. Thanks for confirming that this is going on.

My second comment for you is a question - how did you bypass MC from the Windows DPI settings?

--- End quote ---

sent you PM ... the developers don't like this mentioning as it can cause more trouble than it solve for average user

tij:
here is what happen to my system if I don't bypass DPI

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