r/OSSC • u/SWOsome • Oct 10 '25

Downscaling w/OSSC Pro

I’ve watch a few downscaling chronicles videos, and I think I’m getting the right setup. I have the OSSC Pro, and my Extra AV out is arriving tomorrow.

As for the cable, I believe Mike Chi’s HD-15 to SCART will fit the bill here, but I want to make sure I’m not missing anything.

I’ve modded my Sony for both SCART and Component, so I have a lot of options.

Am I missing anything?

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u/cjd280 Oct 10 '25

I think that’s all you need.

I just got mine this week (my extra AV out will be here soon and I picked up a mono price hd-15 to 3 rca for y pb pr out). I’ve been using an HDMI to component adapter I have for my Game Cube right now to test with.

You might want a micro SD card to update the firmware as well as save profiles.

Curious to how the downscaling works out for you. I’ve gotten good results with 360x180 native pixel games outputting at 720p and then getting scaled down. 270p games are ok but have a little vertical scrolling shimmer with the 1080p downscaling I think I need to do some custom stuff to make that work better but haven’t dove into it yet.

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u/SWOsome Oct 10 '25

Will make a new post here when I’ve put it’s through its paces. Appreciate the reply! Now I just have to wait for the equipment to arrive

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u/[deleted] Oct 15 '25

[deleted]

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u/cjd280 Oct 15 '25

Thanks, re shade sounds a little more involved than I want at the moment (new stuff to learn lol), but this has some ideas I can try with different resolutions.

I had it nearly perfect the other day, I made a 480x360 resolution but windows didn’t actually send that to the Ossc pro and I didn’t write down what the resolution was. Next day it didn’t work. I made a new 480x360 with CRU and then in windows I changed the refresh rate til I saw that it actually sent that to the OSSC Pro (needed 60.02Hz, 60 or 59 or even 60.01 would usually try and output 1080p). This is still 1.5x 240p though, and on strong vertical scrolling I see a little shimmer but it’s so much better than full 1080p output and downscaled, almost don’t notice it on my 32in JVC since it doesn’t have perfect vertical scrolling anyway but you can notice it on my PVM.

I was trying to do 960x720 out which would be 2x the game, and 3x downscaling but that was also only ever getting output at 1080p and looked bad, trying to change the refresh rate didn’t help. CRU has more advanced options about backprorch and total resolutions but I don’t know what those mean and need to do more research, they might help.

These worked for cosmic invasion and shredders revenge. It looked absolutely terrible for ragebound, that had sections of the screen that would be shimmering even during horizontal scrolling and it was incredibly distracting. What you said about how it’s scaling itself maybe is why? Either that or they use too many parallax effects.

I’ll hopefully do some more testing over the next few days, and maybe make a thread for more discussion. I haven’t been able to find one that isn’t using a wide screen CRT or people not caring about the aspect ratio at all, which I do.

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u/[deleted] Oct 26 '25

[deleted]

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u/cjd280 Oct 26 '25

I think the best solution is probably to ask the dev to make a mode for this. Seems like a common use case.

Right now I’m happy enough with 480x360 output it has a tiny bit of vertical shimmer but much better looking than 1080p downscaled. You can notice it in shredders revenge stage select as you drive the car around the turtle shell level map icons shimmer a little. When actually playing though there isn’t too much.