LaminGaming
@lamingaming
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The one I used for the screenshots is this one by Retro Verse: https://videogameperfection.com/products/pal-n64-svideo/
It happens with every cable I’ve tried regardless of how well shielded it is, so it doesn’t seem to be an interference issue with the cables themselves, I think it’s probably got something to do with how the PAL N64 is outputting the signal or how the Koryuu is treating it. I don’t know if this issue happens with an NTSC N64. I also checked the composite output and that was okay, so it’s only the s-video output.
Here’s another edit this time showing composite on the left and s-video on the right. With the s-video you can clearly see the lines on the red and blue of Mario’s clothes.
Interesting, I guess that makes sense. I had a feeling it might potentially be a limitation of the OSSC but wasn’t sure.
If it was possible, I think it would’ve been ideal if you had control over the horizontal multiplication in some way, maybe as a separate setting or something. At least then, it would help to account for particular resolutions with PAL and NTSC.
Speaking of PAL, I recently found out that I can 4x scale 480×270 (512×288 cropped) to 1440×1080 (3x horizontal and 4x vertical) by using the 384 optimised mode, which gives me an integer scaled 4:3 aspect ratio. Whereas, the 512 optimised mode can only 4x scale 480×270 to 960×1080 (2x horizontal and 4x vertical), which doesn’t work. This is why I think having control over the horizontal multiplication would help in instances like this.
Here’s a screenshot I took showing a 512×288 game at 4x using the 384 optimised mode:
Yeah, there are scrolling diagonal lines that show up prominently in primary colours, such as reds, greens, and blues. It only seems to happen with my N64, as I’ve tried the same S-Video cable on my SNES and had no issues. So I’m assuming it’s an issue with the N64 and not the Koryuu itself, but I honestly don’t know. I’ve also read posts from other people experiencing the same thing, so I know it’s not my N64 in particular.
I still can’t work out what the issue is, so I decided to get some sound recordings directly from the OSSC to share what I’m talking about:
• NORMAL.wav – Is using stock settings.
• CHANNELS SWAPPED.wav – Has only “Swap left/right” turned on.
• MONO MODE.wav – Has only “Mono mode” turned on.
https://drive.google.com/drive/folders/1RH31R0fcuK88GHWqHAbth2o4oX4zhUQO?usp=sharing
I’m thinking maybe it’s an issue with something on the OSSC’s board, a faulty resistor or cap perhaps?
Edit: I used my audio probe and found that R49 and C125 (left channel) are quieter than R51 and C123 (right channel), so maybe R49 or C125 is the culprit… I also found that switching the jack switch to Av1 OUT had no issues
Yeah, it says 525-i and there’s no light in any multiplication mode. If it was working, the green light would be on. This is how I know it isn’t my TV not accepting the signal. I also tested it through my Cam Link into OBS, as that’s been very reliable with everything I’ve tried, though unfortunately with the same results – not receiving a signal. So I know it’s an issue specific to the OSSC, but I don’t know what is the cause. Unless it’s got something to do with the Koryuu Transcoder in some way, like maybe it needs to be updated, as I recall the update fixed a couple of bugs. The N64 is the only console I have hooked up through the Koryuu, so that could be a reason. But it still doesn’t explain why it worked with v0.90.
Known issues with the Koryuu: https://junkerhq.net/xrgb/index.php?title=Koryuu#Known_issues_.2F_limitations
Edit: I realised it actually says 262-p for 480i, and then switches to 263-p for 240p, so it isn’t 525-i. The OSSC might be misinterpreting the signal as 240p maybe.
