New converter chip can convert DisplayPort 2.0 to HDMI 2.1

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Aug 9, 2021.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. Mufflore

    Mufflore Ancient Guru

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    Sadly no mention of whether it will pass audio untouched.
    Current active DP to HDMI adapters limit audio to 16bit 48KHz,
    Lower freq wont work, no audio. Same with higher freq, it has to be exactly 16/48.
    This made my DP adapter pointless as I only need it to send a signal to my hifi for films etc to get full bandwidth audio, and it cannot do it!

    My new gfx card gets around this with 3 HDMI and 3 DP so I never need another bad performing adapter, it formed a major part of my purchase decision.
    Poor show from these adapters.


    edit:
    It doesnt actually mess with audio, I phrased that badly. It simply wont pass anything other than 16/48.
    Because it can only pass 16/48, windows will resample everything to that.
    If you try to send audio "directly" (ie ASIO, WASAPI) it must be at 16/48 or there is no audio.
    Send a different rate and there will be no audio.
     
    Last edited: Aug 9, 2021
  3. Trihy

    Trihy Member Guru

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    I'm using cheap DP to HDMI (not active I guess) adapter just for audio and still works. Only tried on nvidia 1000 series. But works fine at every bitrate/frequency.

    It won't work on newer cards?
     
  4. Mufflore

    Mufflore Ancient Guru

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    Its not a gfx card issue.
    The key is the adapter cable being active (powered from DP/HDMI or an external power supply).
    Also, audio still works because windows resamples to 16/48.
    High def audio doesnt work unless downsampled, everything must be 16/48 to get sound.
    In other words, if you want high definition audio from music or films etc, you cannot with an active adapter.

    ps
    This is not about the adapter this thread is for.
    It might have the same problem, I hope not for everyones sake.
    Thats why I posted about it, to raise awareness in case anyone gets caught out.
     
    Last edited: Aug 9, 2021

  5. Trihy

    Trihy Member Guru

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    But, if it just for audio, you can still use a passive one, right?

    Wonder how long will this works being such different protocols.

    I like cards with two HDMI outputs, but most are 3 DP and 1 HDMI.
     
  6. Mufflore

    Mufflore Ancient Guru

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    Video (for films) has to get to the system as well.
    None active DP to HDMI adapter cannot pass UHD video, we are forced to use an active adapter which wont pass high def audio.
     
    Last edited: Aug 9, 2021
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