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What is NDI Network Device Interface ?

What is NDI Network Device Interface  ?


NDI (Network Device Interface) is a network device interface, a copyright-free standard developed by NewTek Corporation of the United States, which enables compatible video products to communicate, transmit and receive broadcast-quality video products in a high-quality, low-latency, frame-accurate manner. Video, ideal for switching in live production environments.


When NewTek developed NDI, NDI was already considered a copyright-free technology that everyone could use, and it was widely adopted by broadcast TV equipment suppliers.


Different from other professional IP video protocols, such as SMPTE's SMPTE2110, SMPTE2022-6, and Adaptive Sample Image Encapsulation (ASPEN), these protocols all require a 10 Gigabit network environment.


Unlike NDI, which is designed to run on Gigabit networks, it is a protocol that can be adopted using existing network infrastructure.


This is achieved by video data compression using the NDI codec, which provides full HD video in 1080 format at a variable bit rate data rate of about 100Mbit/s on average.


When you need to capture and input SDI/HDMI video sources such as external cameras, drones, and game consoles to the computer for video conferences, or live webcasts such as Douyin/Kuishou/Taobao/Games, there are physical connection solutions for capture cards on the market. And NDI network connection scheme is optional.


The capture card solution needs to install a capture card (or connect to the capture box) on the computer, and connect it through the SDI/HDMI physical signal line for one-to-one signal transmission.


The NDI transmission solution is a more efficient IP-based transmission solution. Install the NDI discovery software on the computer, and connect the small-sized NDI encoder to the signal source and the on-site IP network to realize multi-channel transmission of any SDI/HDMI signal. This solution has the following application advantages  :


1) Save on-site wiring: You only need to install the NDI encoder on the camera to connect the signal source and network cable, and the back-end computer can be easily deployed, eliminating the need for complicated SDI/HDMI connections and computer hardware installation, and The transmission distance is not limited (transmission within the same local area network is sufficient).


2) Multi-channel transmission: The back-end computer can receive any front-end video source, or any front-end video source can be simultaneously received by multiple back-end computers (the number of channels is related to the on-site network bandwidth).


3) Low latency and high synchronization: The end-to-end delay of NDI transmission is as low as less than 100ms, and accurate frame synchronization has been achieved.


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