EVR/VMR horrendous downscaling. Is it normal?

[mzso]

Hello!

Unfortunately I didn't find a DVB program that works with madvr. So I'm forced to use one of these.
All of them produce a really ugly image when I downscale it, horribly aliased. I often have the DVB program window on top in a small size and do something else until something of interest is shown.
It just looks really bad:

[turbojet]

Can you adjust the resizer in the pvr program?

NextPVR supports madvr and dvb also I think JRiver does but it's $.

[mzso]

Originally Posted by turbojet

Can you adjust the resizer in the pvr program?

NextPVR supports madvr and dvb also I think JRiver does but it's $.

I tried NextPVR. It's bugged with madVR. It also can't use LAV which has the best deinterlacer available to me.

I use progDVB. Which has EVR-CP but no settings available. So I don't know what's the point.

Maybe I'll have a look at JRiver.

[JanWillem32]

The artifacts seen are aliasing problems caused by resizers that do not compensate for the Nyquist frequency. The regular resizer functions of the EVR and VMR don't have lowpass before resizing functionality nor resizers with a reducing sampling kernel. The custom renderer types based on the EVR and VMR don't have such functionality either, except for those I implemented in the experimental builds.

[mzso]

Originally Posted by JanWillem32

The artifacts seen are aliasing problems caused by resizers that do not compensate for the Nyquist frequency. The regular resizer functions of the EVR and VMR don't have lowpass before resizing functionality nor resizers with a reducing sampling kernel. The custom renderer types based on the EVR and VMR don't have such functionality either, except for those I implemented in the experimental builds.

Okay. So that means that I need to find a DVB program with madVR support, to have decent downscaling. "Great"...

[STaRGaZeR]

No, it's not normal. That looks like nearest neighbor. Check your GPU drivers and settings.

[mzso]

Originally Posted by STaRGaZeR

No, it's not normal. That looks like nearest neighbor. Check your GPU drivers and settings.

I'm unavare of any relevant settings. What would I check driver wise?

[JanWillem32]

I'm sorry to be the bringer of the bad news, but nearest neighbor-like output is to be expected when you're dealing with aliasing artifacts. The driver is actually at fault here, but you can't change that. It's nothing special; the drivers and the EVR just don't implement this kind of advanced functionality. The control panels that the video drivers offer allow you to set some video-related filters. In some cases some "enhancement" filters will be enabled by default, and those cause distortions that can be annoying. I see some possible sharpening artifacts in that picture, so maybe you can disable the sharpening filter(s).
As for the resizer selection for EVR CP, you can review the setting in the "View", "Options", "Output" menu.

[STaRGaZeR]

Lean and mean EVR leaves the resizing up to the driver, as said. If you see that crappy resizing, your GPU/driver is at fault. Unless you have something messed up with the driver, you should get at least basic bilinear. Without more info on your setup there's nothing more to suggest really.

[mzso]

Originally Posted by JanWillem32

As for the resizer selection for EVR CP, you can review the setting in the "View", "Options", "Output" menu.

You seem to assume, I'm using mpc-hc. But I don't, I use progDVB. I mpc-hc doesn't seem to with my tuner card. (And I use madVR with it anyway.)

Originally Posted by STaRGaZeR

Lean and mean EVR leaves the resizing up to the driver, as said. If you see that crappy resizing, your GPU/driver is at fault. Unless you have something messed up with the driver, you should get at least basic bilinear. Without more info on your setup there's nothing more to suggest really.

There's nothing interesting in my setup. I have a GTS450 with the latest driver.

[QBhd]

Have you tried SmartDVB?

SmartDVB

QB

[turbojet]

I use nextpvr with madvr and lav filters and it works well, what problems are you having with it?

Also Potplayer might be able to use your card, it works for 3 different atsc ones for me and you can use whatever renderer and decoder you want but you can in nextpvr too.

[mzso]

Originally Posted by turbojet

I use nextpvr with madvr and lav filters and it works well, what problems are you having with it?

Also Potplayer might be able to use your card, it works for 3 different atsc ones for me and you can use whatever renderer and decoder you want but you can in nextpvr too.

Several problems. The video was misaligned sometimes, half outside screen or not scaled. The OSD was wrong too, I forgot how.
But as I understand it's bug for everyone. Are you sure you're actually using madVR?
With LAV I only got a blackscreen. With HW acceleration. Didn't try without, because it's pointless without it and HW deinterlacing.

Potp apparently doesn't support DVB-C.

[mzso]

Originally Posted by QBhd

Have you tried SmartDVB?

SmartDVB

QB

I will. But since it also only has EVR...

[QBhd]

Originally Posted by mzso

I will. But since it also only has EVR...

?? I go to that site specifically for PotPlayer... doesn't SmartDVB use PotPlayer, and as such use madVR?

Just spit balling here since I don't use DVB, but I do use PotPlayer and madVR.

QB

[mzso]

Originally Posted by QBhd

?? I go to that site specifically for PotPlayer... doesn't SmartDVB use PotPlayer, and as such use madVR?

Just spit balling here since I don't use DVB, but I do use PotPlayer and madVR.

QB

I was actually thinking of another DVB program. I tried this one already. Couldn't get it to work at all with my tuner. Seems DVB-S only.

[QBhd]

bummer... Well that is the extent of my DVB knowledge

QB

[pirlouy]

It' not the original question, but FWIW I use DVB with MPC-HC and madVR. It works well.

If it does not work with you, there are active delopers, so you can open a ticket on their tracker.

[mzso]

Originally Posted by pirlouy

It' not the original question, but FWIW I use DVB with MPC-HC and madVR. It works well.

If it does not work with you, there are active delopers, so you can open a ticket on their tracker.

DVB-C? Didn't work out for me. It found only a few channels but they didn't work. It's settings are weird. It lacks settings for what others have and has ones that others don't. (bandwidth, offset vs symbol rate, modulation.)

[pirlouy]

Arf no. In my case, it's DVB-T. I don't know for DVB-C.
For settings, indeed you're limited, but for my limited use, it's perfect. A little rectangle in corner of the screen with Madvr and LAV doing good job.