Increase the compatibility with TV

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  • December 16, 2017 at 10:29 AM #18023
    ludovictor
    Participant

      Hi everyone ! I have a technical question for marqs.

      If I perfectly understand how works the OSSC, it multiply each line by 2 3 4 or 5 and it increases the size of the screen. For example if I have a resolution of 240p, I can have 480, 720, 960 etc …

      The problem of the compatibility is TVs don’t understand the strange resolution like 720×960. Is it not possible to add “black pixel” to get a good resolution. Because the OSSC multiply the number of line, it could count the number of pixel too. So is it possible to add black pixel on the right and the left of the screen to get a good resolution and so to be compatible with TVs.

      What do you think about that ? I don’t think it is difficult to add this possibility. And if it adds very few lags, I think it could be good to have the choice between compatibility and lag.

      December 20, 2017 at 10:42 AM #18074
      BuckoA51
      Keymaster

        Such functionality is not possible without a frame buffer.

        December 30, 2017 at 1:57 PM #18250
        SRRAE
        Participant

          Would it need a buffer?
          I don’t understand fully how the OSSC works but what I do understand is the OSSC gets the line from the analogue signal and then pumps it out digitally either doubling, tripling etc the output line.

          Is it possible, to say, when it reaches line 960, it then outputs 120 blank lines? It won’t use the full screen size of 1080 and will ultimately cause it to be in a box in the middle of the screen, but it will make the resolution more standard and accepted by more TVs.

          I have seen an option which asks which resolution you want one of the multipliers to output.

          December 30, 2017 at 2:45 PM #18252
          paulb_nl
          Participant

            The OSSC already outputs standard resolutions: 640/720×480, 1280×720, 1920×1080 so thats not the problem. The output timings is the problem and the OSSC needs more line buffer memory and clock hardware to output correct timings.

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