Dreamcast S-video 480i alternating fields are wrong

NewHome Forums Koryuu Transcoder Dreamcast S-video 480i alternating fields are wrong

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  • #40978
    AJBats
    Participant

    I just recieved my Koryuu, which I bought for my dreamcast. I hooked up the DC through S-Video to the Koryuu, and then the output component cables are hooked up to a standard consumer CRT TV set.

    The result are alternating fields, but they are synced up on even (or odd) rows. This results in the image looking both like 240p, and shimmers like 480i. I’ve tried many times to get a image with a camera, but no luck.

    I did notice this note from the wiki:
    “Interlace signal field reversal – Intermittently, the Koryuu will reverse the fields in an interlace signal (odd field will be switched with the even field).
    This can cause compatibility issues with the OSSC or other undesirable effects on CRT displays. Usually, power cycling the unit or switching to a different input will cure the problem.”

    This certainly sounds like what is going on, however the workaround suggested here is not working. I will turn off and on the koryuu, no luck. I also turn it off and unplug it for 10 seconds, and also no luck.

    Any ideas?

    #41046
    BuckoA51
    Keymaster

    It is something we’re looking into, you might need to power cycle Koryuu a number of times before it locks on correctly.

    Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?

    #41090
    nmalinoski
    Participant

    Though I’m curious as to why you would use a Koryuu on a Dreamcast when component video cables are available?

    Only thing I can think of is a desire to play the handful of titles that don’t support RGB output (as in composite-/S-Video-only) without a patch. (That would also preclude use of HD Retrovision’s cables, which appear to require RGB.)

    #41289
    megari
    Participant

    I am testing a version of the firmware that I’m hoping will help with various issues related to interlacing and transitions between interlaced and progressive modes. If you’re willing to give the test firmware a try, please feel free to send me a message!

    #41360
    megari
    Participant

    A new test version of the Koryuu firmware was released this week. I would be very interested to learn if it has improved the NTSC field reversal problem. Would you be willing to try it?

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