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Sync drop out when a game switches between 240p and 480i solution?

Home Forums OSSC OSSC – Feature Requests Sync drop out when a game switches between 240p and 480i solution?

This topic contains 6 replies, has 4 voices, and was last updated by  awe444 5 months, 3 weeks ago.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #13254

    crx91
    Participant

    Hi,
    i’m happy using my DIY ossc with my psone and i’m immagining that this question was already asked hundred of times, but there isn’t any solution for the sync drop out when a game switches between 240p and 480i (like Chrono Cross) ?

    #13255

    gruntbuggly
    Participant

    Could you try Line4x mode? It outputs 960p for both 240p and 480i, so this should take the monitor’s slow sync speed out of the equation.

    #13256

    crx91
    Participant

    Really? tomorrow i will test, if it’s true that should be great!

    #13257

    awe444
    Participant

    Could you try Line4x mode? It outputs 960p for both 240p and 480i, so this should take the monitor’s slow sync speed out of the equation.

    Careful—although it outputs 960p for both modes, the input (and hence output) frame rate is still different between the two modes (59.82 Hz for 240p source, 59.94 Hz for 480i source). So the monitor will still have to re-sync.

    The real solution is to get a secondary processor that can handle these transitions well. The XPC-4 is one of the best (it handles these transitions in about a second, usually less), and its DVI input makes it a great match for the OSSC’s DVI output, but at around $400 it’s not a practical solution for most. Unless you also are interested in being able to render the 960p image at native resolution inside a 1080p window—which the XPC-4 also does flawlessly—or output in VGA/component/S-video/composite, which it also offers.

    #13329

    crx91
    Participant

    Yes, unfortunately even in Line4x mode there is always a sync drop out…
    That would be awesome if a solution\escamotage comes out.

    #13351

    BuckoA51
    Keymaster

    The real solution is to get a secondary processor that can handle these transitions well.

    The OSSC handles these transitions as fast as anything on the market as far as I’m aware. The only way to do it would be some kind of framerate unlocked device with a frame buffer, maybe that’s XPC-4? I seem to remember someone said one of the cheaper scalers does it by basically outputting everything at 59.94 and framerate converting all input. Of course that then causes scroll stutter.

    #13353

    awe444
    Participant

    The OSSC handles these transitions as fast as anything on the market as far as I’m aware

    Sorry, I wasn’t implying the OSSC doesn’t handle 240p/480i transitions well, you’re right of course it handles them faster than most if not all devices on the market. I meant to convey that since the OSSC is a passthrough device for framerate and at least one device in the OP’s described setup (e.g., monitor/display) doesn’t handle resolution and/or framerate changes well, it doesn’t matter how fast the OSSC handles said transitions, the monitor/display will always cause problems unless something is put between it and the OSSC that can handle them faster, and that almost certainly means something with framerate locking like the XPC-4 or similar (which as you’re correct to point out introduces some stutter). For the same amount of money it’s possible you can also get a better display that handles the transitions faster,

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