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MiSTer-devel / S32X_MiSTer

Sega 32X implementation for MiSTer
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Wrong colors on CRT with s-video transcoder #15

Open jfroco opened 2 years ago

jfroco commented 2 years ago

Thank you for this core!!

I got wrong colors when using a CRT @15KHz, I tried both the analog IO board and direct video. Then I use a transcoder to s-video (wakabavideo).

image_50390017

All other cores work great with this transcoder (except for Wonder Boy arcade core that has the same behavior).

birdybro commented 2 years ago

Screenshot 2022-04-22 21-52-55

Here's a capture from the analog IO board to a retrotink 5x Pro using YPbPr. Looks normal to me for analog video in general. Maybe @MikeS11 would know something about what is going on, he's dove really deep in YC lately.

MikeS11 commented 2 years ago

This has more to do with the external AD7XX(or other?) encoders inability to match the core to the reference NTSC frequency. There are some arcade cores like arkanoid that have the same issue.

As the core matures, timing improvements may help but at the moment its not really a core issue. If you really need Y/C you can try the YC test build.

jfroco commented 2 years ago

This has more to do with the external AD7XX(or other?) encoders inability to match the core to the reference NTSC frequency. There are some arcade cores like arkanoid that have the same issue.

As the core matures, timing improvements may help but at the moment its not really a core issue. If you really need Y/C you can try the YC test build.

Thank you @birdybro and @MikeS11

Yes, I was suspecting this, as I have the same issues with some arcade games on MiSTer (Wonder Boy) and emulators with the very same encoder.

I have the following workaround: I send the analog signal through an OSSC, configured at 1x, and the through the s-video encoder, and it works OK. Probably, the OSSC is "standardizing" the frequency.

@MikeS11 I didn't know about the YC builds ( https://github.com/MikeS11/MiSTerFPGA_YC_Encoder/tree/main/YC%20Builds ). I need to find a cable to try it. Thank you!!!

thehughhefner commented 2 years ago

This issue is not related to the core. Ticket can be closed

Kitrinx commented 2 years ago

S32X.zip could you see if this resolves your problem with the video converter please?

jfroco commented 2 years ago

S32X.zip could you see if this resolves your problem with the video converter please?

Thank you, but it doesn't. I have the same problem with this version. image_50581761

Kitrinx commented 2 years ago

S32X.zip one more try with the blanks better aligned

jfroco commented 2 years ago

S32X.zip one more try with the blanks better aligned

Again.. Thank you, but same colors :(

In this picture you can see also more clearly a vertical bar on the left side of the screen that has been there since the first release. image_50387713

SplashAF commented 2 years ago

Also experiencing the same incorrect colors on the Retrocastle analog board when outputting to a CRT via svideo. Just providing another data point. Thanks again for the great work!!!!

emezeske commented 1 year ago

Also an issue for me -- this is the only core where I experience this behavior. (And +1 to SplashAF -- thank you for the hard work!)

EDIT: It's perhaps worth noting that I have the issue with the Antonio Villena S-video converter. So it's not just happening for folks with the wakabavideo converter.