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output sync polarity option

Home Forums OSSC OSSC – Feature Requests output sync polarity option

This topic contains 3 replies, has 3 voices, and was last updated by  goombas 1 month, 1 week ago.

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  • #11740

    goombas
    Participant

    Hi there,

    Would it be possible to have a setting that sets the output v-sync/h-sync polarity (Pos/Neg/Pass Through)?
    My capture card won’t work unless this is set correctly.

    By the way, plugging a Genesis II to a TV via the OSSC and the XRGB mini, the later initially shows a negative v-sync/h-sync input on the status page but switch to a positive v-sync/h-sync as soon as I change a video setting on the OSSC, like going from Line2x to Line3x. I have to reboot the OSSC to restore the negative polarity.

    Might be a bug on the framemeister but could you explain the default OSSC behavior?

    Thx.

    #11876

    marqs
    Participant

    OSSC currently always outputs at negative H&V polarity. It should be possible to add an option for custom polarity once the sync generation code is cleaned up a bit.

    #11882

    Harrumph
    Participant

    Hmm, very interesting, I see from some TV manuals and CEA spec sheet that most resolutions above 480p use positive sync polarity. Will be very interesting to see if this contributes to display incompatibilites…

    #11895

    goombas
    Participant

    Ok, thanks for the info.

    I retried my test the other way around: after 3 reboots of the framemeister without touching the OSSC, the status page switched from NEG/NEG to POS/POS.

    I conclude that there is a glitch on the framemeister side.

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