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Thread: Studio Monitor - Black Video from Multicast Streams (Win10)

  1. #1
    Registered User
    Join Date
    Mar 2012
    United States

    Studio Monitor - Black Video from Multicast Streams (Win10)

    I posted this on the NDI Facebook Group, so if you've seen this already, I apologize.

    Brand new clean Win10 install (it's an Intel NUC8). All drivers up to date.

    With NDI Tools installed (downloaded today, so 4.5), I get just a black screen for either of two multicast streams on this network... but they work fine on another system on the same switch (Netgear M4300).

    In Wireshark, I can see the IGMP membership reports and leave messages, and all of the UDP packets the same as on the working system. I can also see the querier messages.

    Win10 firewall is all disabled.

    Just for kicks, the multicast prefixes are different for two BirdDog P200 cameras.

    I can get NDI Test Patters from working computer over to the NUC, but that isn't multicast. I can also get Test patterns from the NUC to the working PC... also not multicast.

    The NUC does not have any other network connections active... Bluetooth and WiFi are disabled. The Ethernet connection is set to a Private Network. I disabled EEE and low power modes on the driver.

    It doesn't matter if I close Studio Monitor on the working system.

    The IGMP snooping table for the Netgear M4300 switch shows the same things for both clients.

    BirdDog Multiview shows the streams perfectly fine! If I run Studio Monitor at the same time, I don't get extra membership reports in Wireshark, and closing one of them doesn't give a leave group message.

    I also installed OBS with the NDI plugin. The multicast streams show up there just fine as well.

    As another exercise, I set a BirdDog decoder to decode one of the multicast streams, and hooked the HDMI output to the HDMI input on a BirdDog encoder set to transmit multicast. That stream opens just fine on the working PC but not the other. But, the decode/encode cycle tells me multicast is working OK.

    Unicast streams open in Studio Monitor just fine.

    I also set up a 3rd PC today and that one also just gives black screen. What am I missing here?

  2. #2
    Registered User
    Join Date
    Mar 2012
    United States

    As a last ditch effort, I went and ran NDI Analysis on the working PC and compared to the non-working PC.

    Turns out, NewTek is gradually updating the NDI Tools package without specifying incremental versions. The download links just tell me I'm downloading 4.5.

    When I ran NDI Analysis from the working PC I noticed the NDI Version reported as, and on the other PCs, it reported as Oh, so they're different?

    I took the whole NewTek folder, which has the NDI Tools, SDK, NDI Runtime, and NDI Analysis folders and copied them to the broken PC, made a backup of the NewTek folder, and copied in the older version.
    Right away, everything works. So.. I guess NewTek broke something with multicast on the latest release.


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