OSSC (DIY video digitizer & scandoubler)

[maxtherabbit]

@marqs

the option to use AV3 as a sync source with LPF'd RGB is really cool, would it be much trouble to extend that to AV2 as well?

i.e. be able to use coax RCA cables for RGB going to AV2 and feed sync to the VGA port?

you could keep it to a single config option, just have 3 choices (AV1, AV2, off)

[SavagePencil]

Sampling phase was moved to advanced timing tweaker in last firmware.

Ah, but not a direct input on the remote?

[Harrumph]

Hmm right, I forgot there was direct button on the remote, I normally just go into the menu.

But this item in the list
** Enabled sampling phase adjustment while in menus
implies that it should work using the remote shortcut though.

The rest of your remote buttons work fine?

[nmalinoski]

@marqs

the option to use AV3 as a sync source with LPF'd RGB is really cool, would it be much trouble to extend that to AV2 as well?

i.e. be able to use coax RCA cables for RGB going to AV2 and feed sync to the VGA port?

you could keep it to a single config option, just have 3 choices (AV1, AV2, off)

I would think this would make more sense, because you're likely coming from a DE-15 port, and DE-15 to BNC and BNC to RCA adapters are dirt cheap compared to anything SCART.

[fernan1234]

Would it work to feed sync-on-green RGB into AV2 to avoid having to feed sync into AV3, and still benefit from the LPF? A lot of cheap Extron boxes can convert RGBS to RGsB.

[nmalinoski]

Would it work to feed sync-on-green RGB into AV2 to avoid having to feed sync into AV3, and still benefit from the LPF? A lot of cheap Extron boxes can convert RGBS to RGsB.

It would be a viable solution. The way I see it, the cost of an RGB interface and cabling (RCA to BNC cable(s) or RCA to RCA component cable plus RCA to BNC adapters) would be comparable to a properly-attenuating SCART cable, and cheaper than an RGB interface, BNC to SCART adapter, and an inline sync attenuator.

The downside is if you have mixed RGB and YPbPr sources, because occupying AV2 with RGB means that you'll need to manually switch between YPbPr and RGsB (switching cables and/or switching input on the OSSC); so, if you want to avoid that, the next-best option for YPbPr is AV1 (you'd encounter the same problems you're trying to avoid for RGB if you use AV3), which means you'll need some kind of relatively-pricey SCART adapter; and, if you're buying a SCART adapter anyway, you might as well keep using AV1 for RGB (Could still use an Extron interface to send all your RGsB, RGBS, and RGBHV sources to AV1) and AV2 for YPbPr.

[maxtherabbit]

Would it work to feed sync-on-green RGB into AV2 to avoid having to feed sync into AV3, and still benefit from the LPF? A lot of cheap Extron boxes can convert RGBS to RGsB.

sure that would work, but since he's already got the framework in place it seems like adding AV2 as an option should be trivial and would benefit certain setups

[strayan]

Can the OSSC scale by a factor of 1.25?

[H6rdc0re]

Can the OSSC scale by a factor of 1.25?

The OSSC works by line doubling.

[maxtherabbit]

hmmm changing from official release .83 to .84 my N64 profile is now showing bizarre green pixel fringes, nothing changed in my hardware or profile other than adjusting the sample rate tweak setting to match the new system

I'm thinking my OSSC doesn't like the new fitter seed?

[Sirotaca]

I think I might be seeing the same thing. It's proving tricky to pin down exactly what situations it occurs in, but it affects multiple consoles and doesn't happen on 0.83 with the same settings.

Spoiler

Notice the weird bright pixels in the morphing ball, and there's a spurious pixel in the pillar below as well.

[H6rdc0re]

Would running line 5x through an CRT monitor @1600x1200p look any good? I want to split the HDMI signal to both my LG OLED 55C6V and an Iiyama Vision Master Pro 454.

[maxtherabbit]

I think I might be seeing the same thing. It's proving tricky to pin down exactly what situations it occurs in, but it affects multiple consoles and doesn't happen on 0.83 with the same settings.

Spoiler

Notice the weird bright pixels in the morphing ball, and there's a spurious pixel in the pillar below as well.

yep looks like the same issue, I suggest a reversion back to the fitter seed used in .83

[marqs]

I think I might be seeing the same thing. It's proving tricky to pin down exactly what situations it occurs in, but it affects multiple consoles and doesn't happen on 0.83 with the same settings.

Spoiler

Notice the weird bright pixels in the morphing ball, and there's a spurious pixel in the pillar below as well.

yep looks like the same issue, I suggest a reversion back to the fitter seed used in .83

Unfortunately it doesn't work like that. Any change to the RTL code will make the previous fitter seed selection irrelevant and you need to start compila iterations from scratch. I recompiled the fw with another seed that almost meets timing, feel free to try if that helps (link).

[maxtherabbit]

I think I might be seeing the same thing. It's proving tricky to pin down exactly what situations it occurs in, but it affects multiple consoles and doesn't happen on 0.83 with the same settings.

Spoiler

Notice the weird bright pixels in the morphing ball, and there's a spurious pixel in the pillar below as well.

yep looks like the same issue, I suggest a reversion back to the fitter seed used in .83

Unfortunately it doesn't work like that. Any change to the RTL code will make the previous fitter seed selection irrelevant and you need to start compila iterations from scratch. I recompiled the fw with another seed that almost meets timing, feel free to try if that helps (link).

well the alternate version is working perfectly for me , pity you have to refit every time though

[Sirotaca]

Thanks marqs, that seems to have fixed it for me as well.

[nullifer]

I've also got the weird green pixels on .84.
I only see them in 5x mode though. (I think, it's the only time i've noticed them)

[Thomago]

Green pixels in 5x rings a bell ... may be a faulty HDMI cable, maybe try replacing it.

[nullifer]

Green pixels in 5x rings a bell ... may be a faulty HDMI cable, maybe try replacing it.

only started with .84 firmware (look at sirotaca's post, mine are green instead of white)

[Thomago]

Well, that actually makes a faulty cable sound more likely, cause why would the OSSC produce different looking pixel defects.
Really, try it, if only to rule out that scenario.

[nullifer]

Well, that actually makes a faulty cable sound more likely, cause why would the OSSC produce different looking pixel defects.
Really, try it, if only to rule out that scenario.

This page has one person describing also the green pixel fringe i'm also seeing, as well as someone with white pixels.
It's also being reported on VGPerfection.

Swapped cable. Still there

it's not a big deal for me since I'm using 3x anyways. Just reporting the issue

[diamondtron]

Does anyone know where to buy more of the HDMI to VGA adapters that videogameperfection used to sell? When I compared the adapter side by side with the tendak adapter, I preferred it over the tendak. I meant to buy more but they’re out of stock now, so I’m trying to find another place to buy the specific adapters.


https://www.videogameperfection.com/201 ... available/

[shmupsrocks]

For the new AV1 Taito F3 functionality, would I connect the HAS to the OSSC via AV1 and AV3 but select the AV1 input on the OSSC?

Also why would FirebrandX change his settings for the new firmware?

"I’m really looking forward to seeing people’s findings, as well as Firebrandx’s updated OSSC profiles!"

https://www.retrorgb.com/ossc-firmware- ... v0-84.html

[Harrumph]

Also why would FirebrandX change his settings for the new firmware?

Because his previous profiles were from before one could use fractional samplerates.

[Windfish]

Here's a question. Does the OSSC support different setting profiles for each input? I ask because several systems may be connected to a single OSSC input via a switch. Here is my particular use case: my GameCube and Wii will, via a component switch, connect to the OSSC's AV2. I would like to use my GCN's GameBoy Player, but the OSSC settings for the GameBoy Player will, presumably, be different than the GameCube proper.

How have people dealt with this?

[nmalinoski]

Here's a question. Does the OSSC support different setting profiles for each input? I ask because several systems may be connected to a single OSSC input via a switch. Here is my particular use case: my GameCube and Wii will, via a component switch, connect to the OSSC's AV2. I would like to use my GCN's GameBoy Player, but the OSSC settings for the GameBoy Player will, presumably, be different than the GameCube proper.

How have people dealt with this?

No, the OSSC's profiles are not dependent on input. You would configure one profile for GameCube proper and another for the Game Boy Player, and you would load the appropriate profile, regardless of which input the source is connected to.

If someone comes up with a reliable method of fingerprinting specific consoles based on the video signal (line counts, refresh rates, signal quirks, etc.), then I'm sure support for that would make it into the OSSC, along with support for automatically loading console-specific profiles, and possibly also baked-in, console-specific defaults.

[Sirotaca]

Here's a question. Does the OSSC support different setting profiles for each input? I ask because several systems may be connected to a single OSSC input via a switch. Here is my particular use case: my GameCube and Wii will, via a component switch, connect to the OSSC's AV2. I would like to use my GCN's GameBoy Player, but the OSSC settings for the GameBoy Player will, presumably, be different than the GameCube proper.

How have people dealt with this?

Which exact settings are you looking to change? 240p GameCube games are rare (only a couple of compilations as far as I know), so if you use GBI to output 240p or 360p you don't have to worry about the sampling settings overlapping with normal GameCube games. You should be fine with one profile for GameCube and one for Wii.

[Windfish]

Here's a question. Does the OSSC support different setting profiles for each input? I ask because several systems may be connected to a single OSSC input via a switch. Here is my particular use case: my GameCube and Wii will, via a component switch, connect to the OSSC's AV2. I would like to use my GCN's GameBoy Player, but the OSSC settings for the GameBoy Player will, presumably, be different than the GameCube proper.

How have people dealt with this?

Which exact settings are you looking to change? 240p GameCube games are rare (only a couple of compilations as far as I know), so if you use GBI to output 240p or 360p you don't have to worry about the sampling settings overlapping with normal GameCube games. You should be fine with one profile for GameCube and one for Wii.

I guess I am hamstrung by my lack of knowledge of the OSSC. I was unaware that profiles were a thing. From nmalinoski's comment above, it seems like they are not input-dependent. So, if I understand correctly you create your profiles (save them to onboard memory or a microSD) and load them (manually) as necessary?

[Harrumph]

To (perhaps) clarify, one single profile can contain a separate setting for each input video mode, i.e. 240p/360p/384p/480i/480p etc. In the case of Gamecube/GBP (using GBI) and Wii, a single profile slot can actually be used, at least if you are satisfied with generic modes. 480i and 480p output is identical for Gamecube and Wii. There would be a potential conflict however between GBI 240p and Wii VC 240p, if you want to use optimized mode for GBI.

[maxtherabbit]

you *can* link one specific profile to an input if you choose to - if you do this every time you select input X you will get profile Y

you can also link inputs to profiles, if you do this anytime you select profile X you will get input Y - this is the best way to have a profile for each console because you can have multiple profiles point at the same input this way