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Convert 50Hz RGB PAL to 60Hz for display on NTSC HDMI TV using OSSC

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This topic contains 4 replies, has 3 voices, and was last updated by  BuckoA51 4 days, 3 hours ago.

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  • #16973

    grips03
    Participant

    Convert 50Hz RGB PAL to 60Hz for display on NTSC HDMI TV using OSSC.

    Videopac+ G7400 is 50Hz RGB PAL only console, there is no 60Hz NTSC model. OSSC currently does not convert 50Hz to 60Hz, so displaying image on NTSC TV is not possible. This feature request would provide the conversion.

    #17032

    nmalinoski
    Participant

    Is framerate conversion like this even possible without a framebuffer?

    #17077

    grips03
    Participant

    Yes, I think it would be possible. There are $20 adapters that convert PAL to NTSC and I don’t think they have a frame buffer in them. I certainly could be wrong. Can marqs reply to say if this is possible or not?

    • This reply was modified 1 week, 4 days ago by  grips03.
    #17079

    grips03
    Participant

    Looks like it might not be possible, see 3:2 pulldown

    https://en.wikipedia.org/wiki/Three-two_pull_down

    Marqs if you can reply to be certain that would be great.

    • This reply was modified 1 week, 4 days ago by  grips03.
    • This reply was modified 1 week, 4 days ago by  grips03.
    #17319

    BuckoA51
    Keymaster

    Framerate conversion requires a framebuffer and always introduces stuttering or tearing.

    I believe the $20 devices you’re talking about simply correct the colour carrier in composite, allowing most NTSC TVs to display them despite the 50hz

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