Devices > Video Cards, Monitors, Televisions, and Projectors

MC and MadVR incorrect scaling resolution (ROHQ)

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tij:
My setup is described in my signature.

I have a setup where for 3D MC switches to 1080p (highest supported resolution for 3D) and for 2D MC switches to 2160p.

When starting video, MC switches to correct resolution dictated by MadVR setting of [devices] -> [display modes] ... TV info screen confirms it receives correct resolution

Problem ... MadVR scales video to resolution that PC was started in

so if i turn on my computer to 1080p ... MadVR will scale my 2D video to 1080p but MC outputs it in 2160p to TV (Windows do 1080p to 2160p???) ... see screen shot

if start PC in 2160p ... MadVR will scale 3D to 2160p but MC outputs it in 1080p to TV

i tested one more time and started PC in 720p ... MadVR scale my 2D 1080p to 1536x864 ... MC output it in 2160p to TV ... see screen shot


... so it seems MadVR is getting wrong information to which resolution to scale ... from MC? ... from LAV?


Can anybody confirm this?

PS. most people will not notice this as their desktop resolution will match the resolution they watch movies on ... but for 3D stuff it is a problem ... starting desktop in 4K ... when watching 3D it gets scaled to 4K only to be output to TV in 1080p (lots of GPU power could have been allocated to image quality instead of image size as 3D only works in 1080p)

Hendrik:
This is not something we have any influence over. Best to talk to the madVR author. Although its likely that your system is just reporting weird things. I would recommend to let MC switch the resolution instead of letting madVR do it, that has proven to be more reliable in the past.

tij:
Funny thing … it works in MC23 perfectly (did MC24 introduce newer MadVR?)

In MC [tools]->[options]->[video]->[display settings]->[display settings automatic change mode] is set to ON

I turn off MadVR [devices]->[display modes]->[switch to matching display mode...] ... but results are same

The reason i believe system is reporting correctly ... when i run 3D in MC23 ... settings for scalings are adjusted so scaling to 1080p (chroma ... as luma doesnt need scaling for 1080p output) is done within limit of 24fps with some margin to avoid frame drops

When same content is running in MC24 on same setting ... there is huge increase in rendering time (from around 20ms to 80ms) causing massive amount of frame drops ... which indirectly support theory that MadVR is indeed scaling 3D 1080p to 2160p ... and then something else (Windows?) scale it back to 1080p for TV output

How does MadVR decides to which resolution to scale ... LAV teels it? ... MC tells it? ... or it just do what it wants?

tij:
here is screenshot of 3D rendering … can see that TV receives 1080p and Dolby Digital ... can also see that MadVR upscales to 2160p

then something (Windows? ... MC? ... NVIDIA?) scales it back to 1080p to output to TV

So ... [Movie 1080p] -> [MadVR -> 2160p] ... [something? -> 1080p] ... [TV -> 1080p]

RD James:
What are your Windows scaling settings for 1080p and 2160p?
If they are set to different scales; e.g. 1080p at 100% and 2160p at 200%, that's likely to be a factor.

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