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Thread: NDI experience at large university

  1. #16
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    NDI Diagnostic Tools

    Quote Originally Posted by jtm57 View Post
    Overzealous is a judgement that I can't make without more data. In our four installations we've had four discovery failures so what might be viewed as network administration run amok might just be par for the course. The networking folks at this high school site will take a deep dive into why the NDI discovery is failing and I'm looking forward to that investigation.

    Our experience is not that NDI works out of the box though I understand that others have had a higher success rate. Better diagnostic tools would be helpful.
    One useful tool is Bonjour Browser. It lets you view Bonjour advertisements outside of an NDI-specific environment. it might let you see where Bonjour sources are and are not available and draw some conclusions from that.

    Mac: Bonjour Browser

    Windows: Bonjour Browser

  2. #17
    I'd add that while is could be mDNS/Bonjour being blocked, it could also be ports 5960/TCP and up.

    First, port 5960 is used as the directory of NDI sources available. If this port is blocked, even if mDNS gets through, the NDI application will not get a list of any sources available for use.

    After that, ports 5961/TCP (and up) are used for the transmission of each NDI source. If you get the list of sources, but when you choose them no video appears, the blocking of these ports could be the problem.
    Kane Peterson
    Key Accounts Sales Engineer
    NewTek, Inc.

  3. #18
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    Quote Originally Posted by kanep View Post
    I'd add that while is could be mDNS/Bonjour being blocked, it could also be ports 5960/TCP and up.

    First, port 5960 is used as the directory of NDI sources available. If this port is blocked, even if mDNS gets through, the NDI application will not get a list of any sources available for use.

    After that, ports 5961/TCP (and up) are used for the transmission of each NDI source. If you get the list of sources, but when you choose them no video appears, the blocking of these ports could be the problem.
    Just to clarify, I believe 5960 is specifically required for the NDI Access mechanism. I don't think its required when Bonjour mDNS is working properly.
    However, as Kane says, 5961 onwards is where your NDI sources are going to exist for the actual video flow.

    Given that the description appeared to be 'no sources appearing', and that NDI Access was not mentioned, on balance, it still seems likely that mDNS blocking is the issue.

  4. #19
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    Quote Originally Posted by kanep View Post
    I'd add that while is could be mDNS/Bonjour being blocked, it could also be ports 5960/TCP and up.

    First, port 5960 is used as the directory of NDI sources available. If this port is blocked, even if mDNS gets through, the NDI application will not get a list of any sources available for use.

    After that, ports 5961/TCP (and up) are used for the transmission of each NDI source. If you get the list of sources, but when you choose them no video appears, the blocking of these ports could be the problem.
    Very good suggestions, thanks, I'll pass that on to the networking folks.

    The organizational implications for in-house NDI deployment are challenging. The media group doesn't understand networking details (and typically doesn't control the levers even if they did). The networking folks are generally risk averse, as they should be, and even more so in education. "You want us to do...what? I'm not sure we can do that. Try the network as it is, call me in the morning." Separate groups, different language, painfully disconnected dialogue, if any. Slow progress, learning on both sides, fun and exciting to watch if not entirely at the desired pace.

  5. #20
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    Quote Originally Posted by jtm57 View Post
    Very good suggestions, thanks, I'll pass that on to the networking folks.

    The organizational implications for in-house NDI deployment are challenging. The media group doesn't understand networking details (and typically doesn't control the levers even if they did). The networking folks are generally risk averse, as they should be, and even more so in education. "You want us to do...what? I'm not sure we can do that. Try the network as it is, call me in the morning." Separate groups, different language, painfully disconnected dialogue, if any. Slow progress, learning on both sides, fun and exciting to watch if not entirely at the desired pace.
    Update: in real world NDI deployments in four public high schools and one medium sized, technically savvy and academically prestigious university, we are zero for five in finding an NDI-compatible and available network. In two cases, we've directly conveyed the NDI ports requirement to the networking group and they were unresponsive. Surprisingly, the university in-house video production group either wasn't interested in or capable of convincing the networking group to make the requisite port-level changes.

    This is a serious impediment to using NDI-based workflow and products at least in the five schools we've visited. Perhaps there is a technical solution with less friction than "open these ports." Targeting relevant networking professionals with marketing advocacy/outreach -- starting with Newtek customers -- would be helpful, too.

  6. #21
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    If you can get your IT staff to agree to join a conference call I can schedule a call with our professional services staff to help them understand it.
    Zane Condren
    Senior Video Specialist
    NewTek Inc.
    new.tk/call

  7. #22
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    Thank you, Zane. I appreciate the outreach and offer.

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