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HDMI input?

Home Forums OSSC OSSC – Feature Requests HDMI input?

This topic contains 8 replies, has 8 voices, and was last updated by  nmalinoski 1 month ago.

Viewing 9 posts - 1 through 9 (of 9 total)
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  • #12475

    QuickRat
    Participant

    Hi!

    As many of you may know, there are very interesting mods out there that add HDMI to some of the most relevant consoles. UltraHDMI for N64 and GCVideo for GameCube are quite interesting indeed!

    However, those cannot be used over an OSSC, which is a real pity, due to the lack of DVI/HDMI input. However, HDMI is quite better than any analog solution. So if some consoles with the correct mod can output HDMI, I would love to run it through OSSC. Smash Bros. Melee through OSSC would be incredibly exciting!

    Would this be possible for future iterations?

    #12497

    BuckoA51
    Keymaster

    What would you hope to gain running Smash Bros through a HDMI modded cube then the OSSC? There’s already a fast deinterlacer in the Gamecube HDMI mod. Likewise with the N64 HDMI mod there’s really basically nothing to be gained piping it through an OSSC.

    #14736

    DirkSwizzler
    Participant

    I just came across this post because I had a similar scenario in my head. More generally any gamecube hdmi adaption (there are several products in this space) that only outputs 480i/p.

    If I land in any scenario where I want the OSSC to do the upscaling operation, then I’m currently S.O.L. And that’s fine because the OSSC has a specific target of digitizing and upscaling analog sources.

    I would hope that future revisions of the OSSC could still upscale an already digitized signal. Or that some separate product would come along that can re-use upscaling portions of the OSSC firmware on an already digitized signal.

    In my head it makes the most sense longer term to have 2 or 3 products in this space.
    1. Digitize an analog signal.
    2. Upscale a digital signal to the latest greatest resolutions.
    (maybe 3.) Upscale while keeping a signal analog. For situations where you want to output to an analog device that accepts high resolution signals. (Maybe CRT projectors?)

    The division of 1 & 2 would allow more frequent replacement cycles of the upscaling component to the latest resolution without throwing away a highly functional digital to analog conversion. The only reason you would replace #1 is when HDMI phases out in the future.

    #14749

    Harrumph
    Participant

    I don’t think that the OSSC needs to be this product you are after, because they already exist.
    If you want to use the OSSC as upscaler with GC, use GCVideoLite for analog YPbPr (or RGB).
    If you still want the GCVideoDVI for HDMI output, let something like a DVDO unit do the upscaling. Or simply your TV…
    Also, there are dual versions of the GCvideo board coming out in the near future anyway, so you don’t even have to choose.

    #15033

    marqs
    Participant

    I think it’d much better to push GCVideo/UltraHDMI developers to implement low-latency (no framebuffer) 1080p or even 4k output in future revisions. For the moment there are already fast generic scalers for HDMI 480p->1080p conversion.

    #21812

    PuzzoMolto
    Participant

    HDMI input for using GC video type devices to push 240p over HDMI (GBI) to the OSSC to then be line tripled, as the GCvideo likes to do linedouble to 480p which is less than ideal for scaling to a modern TV.

    #21821

    nmalinoski
    Participant

    I don’t see that this has been said in this thread yet: an HDMI input would allow us to pair the OSSC with a RetroTINK 2X, enabling use of composite and S-Video sources on the OSSC without trying to shoehorn in yet another analogue decoder.

    Silly question: Assuming an HDMI input would be added, would it become AV4, or AV0?

    #22368

    The Real Phoenix
    Participant

    I agree, pair with the RetroTINK2X would be great. There are also some HDMI mods which just output 480p video like the Akura (I know there are other method to link the DC to the OSSC but this just an exemple).

    #22370

    nmalinoski
    Participant

    Revisiting this after seeing Bob’s review of the RetroTINK 2X for RetroRGB.

    …there are very interesting mods out there that add HDMI to some of the most relevant consoles. UltraHDMI for N64 and GCVideo for GameCube are quite interesting indeed!

    However, those cannot be used over an OSSC, which is a real pity, due to the lack of DVI/HDMI input.

    They can! But not directly. You need to use an active HDMI to VGA converter, like this one from Tendak. (I believe it’s this one that people were talking about on Shmups; someone correct me if I’m wrong.) I’m not sure which one Bob used in his video, but the one he tested proved to be lagless and worked perfectly fine with the OSSC.

    So, something like the UltraHDMI can be run through one of these HDMI to VGA converters, into AV3 on the OSSC. The UltraHDMI in particular has a Direct+Sync mode that can be enabled that simply passes through the video in the original resolution and at the original framerate with no processing or normalization, to which the OSSC can apply its processing. (If your display doesn’t like the original framerate, you can always try the regular Direct mode.)

    However, HDMI is quite better than any analog solution.

    This is generally true. The only problem I’ve seen with HDMI solutions is video dropouts/resyncs from mode switching, which you won’t see with CRTs, on which these games were originally intended to be played. This is typically only a problem for 5th- and 6th-generation consoles, which often used a higher-resolution interlaced mode (480i) for menus and title screens, then switched to a lower-resolution progressive mode (240p) for gameplay. You can also get dropouts when transitioning from these consoles’ boot menus/operating systems to a game that supports ED or HD resolutions, such as the Xbox and PS2, which output in 480i on boot, and then switch to a higher resolution where supported/enabled by a game.

    There are also some HDMI mods which just output 480p video like the Akura

    Yes, but, unlike the Akura, or that PS2 HDMI mod, and possibly that Xbox HDMI cable (I don’t know which audio it taps), a native HDMI mod has the capability to directly source the original digital audio, instead of converting analog to digital. Sure, it’s only stereo, but, when it can be tapped before hitting the DAC, you won’t have any of that analog noise floor hiss.

    Unfortunately, there will be consoles where tapping digital audio isn’t feasible. The only console I’m aware of where this is the case is the Famicom/NES, where Expansion Audio is concerned. My understanding is that Expansion Audio carts feed their audio to the console as analog; so, I imagine any completely-digital Expansion-Audio-capable NES/Famicom would first need the cartridge modified with a coax dongle/port providing S/PDIF (probably makes the most sense to add this to an EverDrive N8, versus modifying original carts), and then the console would need to be modded with an S/PDIF coax input, which would be wired to a theoretical expansion audio input on a Hi-Def NES, where it would get mixed like the original hardware does with the analog audio. Sorry; tangent.

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