Announced by NewTek at IBC 2015, Network Device Interface (NDI) is an open protocol enabling IP video workflows across standard fixed and wireless Gigbit ethernet networks. NDI is a bi-directional standard that allows video systems to identify and communicate with one another over IP, and to encode, transmit, and receive multiple streams of broadcast-quality, low latency, frame-accurate video and audio in real time. The NDI encoding algorithm supports all video resolutions and frame rates up to 4K and beyond, as well as multi-channel, floating-point audio up to 16 channels and beyond. NDI also includes tools to implement video access and grouping, bi-directional metadata, tally, and more.
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Support for the standard has come from the likes of Adobe Pro Video, AJT Systems, Archion, Autocue, Evertz, JVC Professional Video, LiveU, Panasonic, PlayBox, and Vaddio.
With IP-video platforms evolving around SMPTE 2022-6, VSF TR-03 and VSF TR-04 standards (backed by AIMS, the Alliance for IP Media Solutions) and the Evertz-backed ASPEN standard, where does Network Device Interface fit into the broader IP ecosystem?
This should also work with other NDI-compatible live mixers. Figure 5 (below) shows how NDI enables vMix to input the title created in After Effects shown on the bottom in Figure 1. In Figure 1, I’m using the free demo version, hence the logo overlay. The overlay will disappear if you opt for the $9.99 monthly subscription price. If the device is reflected when using a direct connection, check the following in your workflow: Ensure the NDI® source and receiving device are on the same subnet in your network. If this is not possible, utilize our NDI® Access Manager tool to resolve. I'm not sure if this idea has been posted, but I did some testing of NDI in WO last year and I was able bring in a separate computer with After Effects running on it and composite with transparency that was pre-rendered. WO saw the transparency.
According to Dr. Andrew Cross, President and CTO, NewTek, “The best way I can describe it is there are multiple IP standards. At the top of the pyramid, you have AIMS and ASPEN, which are the two 10 Gigabit video, high bandwidth, over 10 Gigabit ethernet. And, what we saw was a need to make something that’s accessible for everybody else who wants to do video.
“If you think about it, once every office building anywhere in the developed world is wired for ethernet, it’s all going to be 1GigE. So, part of NewTek’s vision – and I think what’s going to happen in the industry – is that more and more people are going to want to do video but we want to enable them to work in the facility that they have, not need to rewire it, because the difference between a TV station and an office building is the TV station’s already wired for video.
NewTek has also made NDI® completely interoperable with the previous version. Today, NewTek is pushing 3.8, and soon they’ll be showcasing 4.0. All version of NDI® are forward and backward compatible. So, if you have an original 1.0 NDI® device that has never been updated, it will still work with your TriCaster today. There is also NDI Monitor TV which can be used with an Apple TV 4K. As you can see, there is a wide spread support for NDI now. What might not work with one program, such as a camera, can now easily be brought in or vice versa opening endless possibilities. NewTek has been leading the way for NDI workflows.
“What we’re focused on is making a solution that just works for people wanting to do it on regular 1GigE. So, I would say we’ve got AIMS and ASPEN at the top of the pyramid and our goal is to fill from them on down.”
“If you take AIMS and ASPEN, while they really do serve the needs of broadcasters very, very well and I should say we’re collaborating with them, the problem is that the small guy in the basement is not going to be able to build something around them. So, that’s kind of the difference.
“I bring that up because we have to see ourselves as highly complementary to what they’re doing and we really don’t want to position ourselves as competitive with them at all. In fact, we are part of ASPEN and Evertz has done integration with NDI because it recognises that in a TV station you have the big studios and you have the small studios. Your small studios and your small plants are going to run something like what NewTek has, and the big studios are going to run theirs, and the video should be able to flow between them.”
Aiming to help this flow of video, NewTek recently introduced NewTek Connect Pro, a multi-purpose software tool designed to connect the IP video formats of new and existing video production hardware and software, allowing them to work together. As well as NDI, ASPEN and SMPTE 2022, Connect Pro also supports streaming IP formats found in cameras from JVC, Panasonic, PTZ Optics, Sony, and Vaddio.
According to NewTek’s Andrew Cross, “Our call with NewTek Connect Pro was to create the converter box of all the standards in the IP world and so we built something where you can come in with, for instance, existing cameras.
“One of the ironies of all of this discussion about IP is that most cameras can do IP today. You watch JVC cameras, your Panasonics, your Sonys, all of them will do a transport stream out. It’s just in the wrong format for all this new IP stuff, so we allow it to cross convert from those into NDI. We allow you to bring in SDI capture cards, HDMI capture cards. It can cross convert between any of these things.”
Moving from cameras to the edit suite, NewTek also recently announced NDI for Adobe Creative Cloud, a software plug-in which enables users of Adobe Premiere Pro CC, Adobe After Effects CC and other Adobe Creative Cloud applications to send real-time video and audio to any NDI-enabled receiving product, such as production switchers or capture cards, across a standard ethernet network.
“One of the great things about the IP world is that, in some ways, we have standardised on one thing which is the cable and the packets that go over it,” says Andrew Cross. “And, while we’re all talking about all these different formats you can have a single ethernet cable and it can do NDI, ASPEN and AIMS all at the same time. We’re virtually standardised in a way we haven’t ever before, but one of the great things about having that is it means that people can use the right technology for their needs.
“If you think about the internet, there’s not one technology. You can use PNGs or JPEGs or java script and python, and the cool thing about the Internet is that, by having these different technologies, people can choose the thing that serves their needs the best. And, I think the same has got to be true in our space. We hope to change the discussion from one about formats into one about how we solve problems. That’s our goal with it and we’ll find out, but I know our customers have a need for it so that’s going to be exciting.”
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KlakNDI
KlakNDI is a NewTek NDI protocol plugin for Unity that allows sending/receiving video between multiple computers via a local area network. It provides a high quality, low latency and performant way to mix multiple video streams from several NDI-enabled applications and devices without the need of complex video capturing setups but only a wired/wireless network connection. The plugin is implemented to fully utilize the asynchronous GPU readback and custom texture update feature to achieve the optimal performance and the lowest latency in Unity.
NDI™ is a trademark of NewTek, Inc.
System requirements
- Unity 2018.1 or later
- Windows 64-bit, Direct3D 11
KlakNDI is only available with D3D11 because it's the only environment that supports the GPU async readback functionality at the moment.
The current version of KlakNDI only included 64-bit (x64) binary DLLs. Please note that it doesn't work with 32-bit (x86) Unity players.
Installation
Download and import one of the .unitypackage files from Releases page.
NDI Sender component
The NDI Sender component (NdiSender) is used to send rendered frames to other NDI supported software/hardware via a network.
There are two modes in NDI Sender:
Camera capture mode
The NDI Sender component runs in the camera capture mode when attached to a camera object. It automatically captures frames rendered by the camera and publish them to the network. The dimensions of the frames are dependent on the screen/game view size.
Note that the camera capture mode is not compatible with scriptable render pipelines.
Render texture mode
The NDI Sender component runs in the render texture mode when it's independent from any camera. To publish frames in this mode, a render texture should be specified via the Source Texture property. The NDI Sender component publishes the contents of the render texture every frame.
Alpha channel support
The NDI Sender component uses the UYVY format (4:2:2 subsampled color) by default, which is the most optimal setting to feed a video stream to the NDI library. By enabling the Alpha Support property, it can be switched to the UYVA format (4:2:2 color + alpha) that supports alpha channel. It requires an extra bandwidth and processing resources, so that it's recommended disabling when alpha channel is not actually needed.
NDI Receiver component
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The NDI Receiver component (NdiReceiver) is used to receive frames published by other NDI supported software/hardware via a network.
Name Filter property
In case that multiple NDI sources (senders) exist in a network, the Name Filter property is used to determine which source should be connected. The NDI Receiver tries to connect to the first source whom name contains the string specified in the property. Note that this string matching is case-sensitive.
When nothing is specified in the Name Filter property, the NDI Receiver tries connecting to the first found source without string matching.
Target Texture property
The NDI Receiver updates a render texture specified in the Target Texture property every frame. Note that the NDI Receiver doesn't care about aspect ratio; The dimensions of the render texture should be manually adjusted to avoid stretching.
Target Renderer property
When a renderer component (in most cases it may be a mesh renderer) is specified in the Target Renderer property, the NDI Receiver sets the received frames to one of the texture properties of the material used in the renderer. This is a convenient way to display received frames when they're only used in a single instance of renderer.
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Script interface
The received frames are also accessible via the receivedTexture property of the NdiReceiver class. Note that the receivedTexture object is destroyed/recreated when the settings (e.g. screen size) are changed. It's recommended updating the reference every frame.
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NDI source list view
The NDI source list view is a handy way to check what NDI sources are currently available in the network. To open the list view, from the application menu select 'Window' - 'Klak' - 'NDI Source List'. The list is updated even in the edit mode.
License
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The NDI DLL file (Processing.NDI.Lib.x64.dll) placed in the plugin internal directory is provided by NewTek, Inc under the NDI® SDK License Agreement. Please review the original license when distributing products with the plugin.