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

NewHome › Forums › OSSC, OSSC Pro and DExx-vd isl › OSSC – Feature Requests › Sync drop out when a game switches between 240p and 480i solution?

Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • June 14, 2017 at 10:35 PM #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) ?

      June 14, 2017 at 11:18 PM #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.

        June 15, 2017 at 12:21 AM #13256
        crx91
        Participant

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

          June 15, 2017 at 1:01 AM #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.

            June 18, 2017 at 1:49 PM #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.

              June 20, 2017 at 10:26 AM #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.

                June 20, 2017 at 2:40 PM #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,

                • Author
                  Posts
                Viewing 7 posts - 1 through 7 (of 7 total)
                • You must be logged in to reply to this topic.