OSSC, MClassic, and HDMI Switcher Compatibility

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  • #38132

    Hello, I am looking to see if there is a fix that can solve my issue. Here is a list of the configurations that work fine with my setup:

    OSSC > TV
    OSSC > MClassic > TV
    OSSC > Switcher > TV
    OSSC > MClassic > Switcher > TV
    Other Devices > Switcher > MClassic > TV

    This is the one that does not work:

    OSSC > Switcher > MClassic > TV

    When connecting in this configuration the image cuts in and out.

    I am using 18 GB/s 4k@60 Hz cables. I have tried other cables, a different Switcher as well.

    Has anyone used a similar setup and had this issue? Any suggestions?


    Which TV are you using?
    Which switches?
    using home theatre system, soundbars etc or just the TV?
    any ARC or eARC in your setup?
    Tried HDMI and DVI mode on the OSSC?


    I’m using the following:

    TV – Hisense 55H8F 4K TV
    HDMI Switchers – Kinivo 550BN 5×1 4K@60 HDMI Switch and a Monoprice Blackbird 4K Pro 4×1 HDMI 2.0 Switch
    Soundbar – I’m using a Samsung – 4.1-Channel 240W Soundbar System but the TV connects to it directly, there’s no passthrough from the switcher to the soundbar.

    I’ve tried connecting the HDMI cable into both a regular HDMI port as well as the ARC port of the TV.

    I don’t have anything connected to the Soundbar as I just have a digital in from the TV and all HDMI ports connect to the TV directly.

    I’m not sure what you mean by HDMI/DVI mode. I have tried connecting the OSSC directly to the TV using HDMI if that’s what you mean.



    DVI mode on the OSSC – Output Opt->TX Mode



    Thanks, that seems to make the video work fine. I’m guessing because it’s DVI mode audio does not passthru anymore though. Was the audio passthru the issue then or is there something else in DVI mode that lets the video work well?


    Actually, just tried switching between HDMI (RGB) TX mode w/o audio input and DVI mode and I don’t think that’s the issue. I’m guessing it’s just a data transfer issue or maybe how HDMI transmits the signal vs DVI.

    I’m pretty certain the issue is the mClassic, but if it’s not maybe it’s the cables? I’m not sure if that is the case since I’m already using 4k@60 18gbps cables, but would 48gbps cables actually make a difference here or is it most likely just an issue with how the mClassic interprets the OSSC signal coming through the HDMI Switch?

    Even when I have the mClassic in passthru mode (technically should be off) it still has this issue.

    • This reply was modified 5 months ago by Luchario.
    • This reply was modified 5 months ago by Luchario.

    Definitely an issue with MClassic then, worth asking their tech support for help?

    Changing cables isn’t going to help. The other thing you could do is just route the analogue audio separately.


    Yeah, that’s what I ended up doing for the meantime. I did contact their tech support and this is what they messaged back:

    “Sorry you’re having problems with your setup. We see this problem occasionally happening when there is a non HDMI certified device, and/or a non HDMI 2.0 rated HDMI switch. Non HDMI certified devices tend to produce more signal jitter than certified HDMI devices, and low rated HDMI switches exacerbate the problem further. And when the mClassic upgrades the picture to a higher resolution, it increases the TV’s sensitivity to jitter. Using low quality or cables with internal damage can also create jitter in the signal, but it sounds like that’s unlikely.

    In conclusion, I’d recommend trying another TV to see if it’s the TV that’s just very sensitive to jitter. (Samsung TVs seem to be the most sensitive to signal noise).
    And which HDMI switch are you using?”

    I wrote back with my setup a few days ago and now again with the information that DVI mode works but I’m still waiting for a reply.

    Thanks for the help so far, I appreciate it!

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