OSSC x5 mode aspect ratio correction.

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  • February 6, 2019 at 5:10 PM #25111
    drojman
    Participant

      Hi folks,

      I have an LG B6 which works really well with the OSSC. However while X5 mode works, the image aspect ratio isn’t correct. It looks slightly off while still being roughly 4:3.

      I’m using the 1600*1200 mode which as far as I know should be correct unlike the 1080p mode.

      Does anyone know of a way to tweak the timings to get it correct?

      Thanks

      February 6, 2019 at 6:32 PM #25112
      SavagePencil
      Participant

        Which system(s) does this occur on?

        Are you using advanced timing or the Generic 4:3?

        Have you confirmed by measuring with the linearity test on the 240p test suite?

        Can you post a picture?

        February 6, 2019 at 6:45 PM #25113
        drojman
        Participant

          It’s via my PS2 playing a PS1 title. Line 3x and 4x look great. Generic 4:3 too.

          I will try 240p suite however that’ll be on my gamecube. Will post a pic shortly.

          February 6, 2019 at 8:48 PM #25116
          Harrumph
          Participant

            Most older consoles has an aspect ratio slightly narrower than 4:3. E.g. PS1 is 1.219 (if viewing a game that utilizes the full visible space, with no overscan). This would then be cropped by the overscan of the CRT.
            If it’s different between x3, x4 & x5 (in 1600×1200), then it’s something with the scaling on your display. Edit: ignore, forgot that x5 uses different base for sampling rate

            February 6, 2019 at 8:54 PM #25117
            drojman
            Participant

              I think seeing it now adjusting the horizontal sampling rate corrects the ratio for me. Does that sound right to anyone else?

              February 6, 2019 at 11:31 PM #25119
              Harrumph
              Participant

                Oh right, x5 doesn’t use the same default horizontal scale. I forgot about that, sorry. Sample rate can be set to 1950 instead, should be more accurate. Or you can keep the sample rate at 2046 and increase h.active to 1678 (if your display allows).

                February 7, 2019 at 12:07 AM #25120
                drojman
                Participant

                  Okay yeah 1950 seems to be bang on aspect ratio wise but now the image is shifted left. I assume I need to adjust horizontal backporch?

                  February 7, 2019 at 10:06 AM #25126
                  Harrumph
                  Participant

                    Yes, it should be reduced also.

                    February 9, 2019 at 2:47 AM #25158
                    ArctheLadder
                    Participant

                      Is there an overlay I could use that would allow me to properly center this picture in OBS? I eyeballed it but I’d like to be accurate since I’m recording for some projects I’m working on. The picture looks great now and I can center it myself, but I don’t want to waste hours recording something and then find out my frame wasn’t centered.

                      February 9, 2019 at 3:08 PM #25161
                      drojman
                      Participant

                        I think the best you could do would be measure it from side to side with a tape measure.

                        Line 3x and 4x should be exact, so if you make it the same you’re set.

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