Line Multiplier mode on crt

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  • May 30, 2026 at 1:59 PM #69600
    RainerLeuteritz
    Participant

      Got a ossc pro with an extra av out and a MISTER VGA to SCART cable to work in Scaler mode

      I tired Line Multplier mode and only get a weird flashing picture or small over the place on the CRT

      Is it possible to use Line Multiplier mode on a CRT to get less lag or am I missing something (keept most settings in Stock)

      May 30, 2026 at 3:09 PM #69604
      BuckoA51
      Keymaster

        Perfectly possible as long as you output a mode that your CRT can display. What are you inputting and what mode have you got the output set to?

        May 30, 2026 at 3:13 PM #69605
        RainerLeuteritz
        Participant

          output set to 1024×768 from pc

          crt output mode to 240p

          May 30, 2026 at 3:16 PM #69606
          RainerLeuteritz
          Participant

            May 31, 2026 at 3:04 PM #69611
            Kekstier
            Participant

              You have to set the adaptive line-multiplier Mode and set the line-dropping Mode for your input! I can remember, you are not able to call 768p but 720p … so set your resolution from your PC to 720p… very easy…

              You find the option in ossc pro for line dropping to 240p in:
              Line-Multiplier -> Adaptive LM opt. -> 720p proc. (left) -> 240p (Line-Dropping)

              Or for some cases:
              Line-Multiplier -> Adaptive LM opt. -> 720p proc. (left) -> 480i (Line-Dropping)

              I think, you try the pure line multiplier modus or you set the wrong resolution of the PC!

              I run 480p with my mini pc and do a line-drop to 240p for SNES and 480i for N64… very sharp fast picture and motion! I prefer the lm-a mode, one of the diamonds of ossc pro! Keep in!

              May 31, 2026 at 4:01 PM #69620
              RainerLeuteritz
              Participant

                Gonna try it out thanks

                So the only supported 4:3 ratio is 480p?

                May 31, 2026 at 4:19 PM #69621
                Kekstier
                Participant

                  480p is nativ of course 4:3 … (640 x 480p) … but i also run this 480p proc. setting with 720 x 480p, this was de facto a widescreen format (because the pixels from emulating signal are not quadrat)… so i convert 1:1 … 720 x 480p -> 720 x 480i (is a line dropping preset)… the same is with 240p…
                  You can convert or line dropping your 480p lines to 240p directly, without limits in the cols (the horizontal resolution)…
                  Line-dropping modes are the key for your case, in most of the cases the pan and porch are very direct in the frame of your crt, but you also have a little bit space to crop or stretch your image (by the advances timings of lm-a or output)!

                  May 31, 2026 at 5:38 PM #69626
                  RainerLeuteritz
                  Participant

                    Thx for the help

                    Got it to work

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