Network Device Interface: Difference between revisions

Revision as of 23:40, 2 January 2025

Revision as of 23:45, 2 January 2025

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==Technology==

NDI is designed to run over [[gigabit Ethernet]]<ref>{{cite web|url=https://www.provideocoalition.com/newtek-announces-ndi-an-open-protocol-for-ip-production-workflow/|title=NewTek announces NDI, an open protocol for IP production workflow by Allan Tépper|first=ProVideo|last=Coalition|date=8 September 2015}}</ref> with the NDI codec.<ref>{{cite web|url=http://support.newtek.com/hc/en-us/articles/218109667-NDI-Encoding-Decoding|title=NDI Encoding/Decoding|website=NewTek Knowledge Base}}</ref> It delivers [[1080i]] [[high-definition video]] at [[variable bitrate|variable data rate]]s typically around {{nowrap|100&nbsp; Mbit/s}}.<ref>{{cite web|url=https://support.newtek.com/hc/en-us/articles/217662708-NDI-Network-Bandwidth|title=NDI Network Bandwidth|website=NewTek Knowledge Base}}</ref>

By default, NDI uses [[multicast DNS]] to advertise sources on a [[local area network]], such that NDI receivers can automatically discover and offer those sources. It also supports two other discovery modes (NDI Access, NDI Discovery Server) that allow for operations across [[subnet]]s and without multicast DNS. Sources are created using an arbitrarily selected [[TCP port]] from a range of ports on the NDI senders. When a source is requested, a TCP connection is established on the appropriate port with the NDI receiver connecting to the NDI sender. NDI 3.x has options to use [[User Datagram Protocol|UDP]] [[multicast]] or [[unicast]] with [[forward error correction]] (FEC) instead of TCP, and can [[Load balancing (computing)|load balance]] streams across multiple [[network interface controller]]s (NICs) without using [[link aggregation]]. NDI version 4.0 introduces the ''Multi-TCP'' transport.

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|-

! Image format

| Size &nbsp;/ Aspect Independent

| Size &nbsp;/ Aspect Independent

| Size &nbsp;/ Aspect Independent

| SDI Formats only

| Size &nbsp;/ Aspect Independent

|

|

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| SMPTE 2110-22 spec.([[JPEG XS]], but not limited to)

| NONE

| NONE &nbsp;/ LLVC Codec

| NONE

|-

! Connection

| Socket, Unicast &nbsp;/ Multicast and FEC

| Unicast &nbsp;/ Multicast

| Socket, Unicast &nbsp;/ Multicast and FEC

| Multicast

| Multicast

| Multicast

| Multicast &nbsp;/ ?

| SRD

|-

! HD (1080i) data rate

| ~{{nowrap|100&nbsp; Mbit/s}}

| 8–20&nbsp;8–{{nowrap|20 Mbit/s}}

| ~1–50&nbsp;1–{{nowrap|50 Mbit/s}}

| {{nowrap|>1.5&nbsp; Gbit/s}}

| {{nowrap|>1.1&nbsp; Gbit/s}}

| {{nowrap|>1.5&nbsp; Gbit/s}}

| {{nowrap|>1.5&nbsp; Gbit/s }}&nbsp;/ up to 14:1<ref>{{cite web|url=http://www.nexteravideo.com/nmi-core|title=NMI Core - Nextera Video Inc|website=Nexteravideo.com}}</ref>

| {{nowrap|>1.5&nbsp; Gbit/s}}

|-

! Essence packing