What Is NDI High Bandwidth?
The Standard for Broadcast-Quality IP Video
NDI made it possible to move video through standard IP networks instead of traditional SDI cables. But as production demands increased — higher resolutions, lower latency, and broadcast-quality workflows — another question emerged: how do you send the highest-quality video over IP without compromise?
That's where NDI High Bandwidth comes in.
Designed for professional live production, NDI High Bandwidth prioritizes image quality and real-time performance, delivering visually lossless video with extremely low latency over standard network infrastructure. In this guide, we'll explain what NDI High Bandwidth is, how it differs from other NDI formats, and where it fits in modern broadcast and AV workflows.
What Is NDI? A Quick Foundation
NDI — short for Network Device Interface — is a software protocol developed by NewTek that enables video, audio, and metadata to be transmitted and received over a standard local area network.
Before NDI, getting video between devices meant dedicated point-to-point connections: one SDI cable from camera to switcher, another from switcher to monitor, another from replay to graphics. Every signal required its own physical path. NDI replaces that model with a shared network approach — devices discover each other automatically, and any source on the network can be received by any compatible device on the same network, without additional cabling or routing hardware.
NDI is not a single standard but a family of versions, each making a different trade-off between image quality, latency, and bandwidth consumption. Understanding which version is which matters in practice, because the differences between them are significant enough to affect production decisions.
The three versions in current use are:
FULL SPEED
NDI High Bandwidth
The highest-quality version of the NDI protocol. Using intra-frame SpeedHQ compression, it delivers visually lossless video with sub-frame latency — typically less than 16ms at 1080p60. Bandwidth requirements scale with resolution: 100–150 Mbps for 1080p60, rising to 250 Mbps or more for 4K60.
Up to 150 Mbps
Sub-frame Latency
HX3 HYBRID
NDI|HX3
The practical sweet spot for most modern production environments. It uses short-GOP H.264 or H.265 compression to reduce bandwidth to around 8–40 Mbps at 1080p60 — a fraction of NDI High Bandwidth — while maintaining latency low enough for real-time live switching. For multi-camera deployments on standard gigabit networks, HX3 is typically the most efficient choice.
8–40 Mbps
Live Switching Ready
HX2 REMOTE
NDI|HX2
Optimized for bandwidth-constrained environments — remote production, campus distribution, and networks where video shares infrastructure with other traffic. Using long-GOP H.265, it achieves bitrates as low as 2–16 Mbps, low enough to run reliably over standard Wi-Fi. The tradeoff is latency: HX2 typically introduces 100–300ms of delay, which makes it unsuitable for live switching but practical for monitoring feeds, secondary distribution, and recording.
2–16 Mbps
Remote Distribution
This guide focuses on NDI High Bandwidth — the version designed for professional live production where image quality and switching performance are the priority.
What Is NDI High Bandwidth?
NDI High Bandwidth — also referred to as Full NDI — is the version of the NDI protocol that prioritizes image quality and low latency above all else, transmitting broadcast-grade video over a standard ethernet network without the quality compromises that higher compression introduces.
Think of it as the FLAC of video transmission. Just as FLAC preserves the full audio signal with minimal compression while MP3 discards detail to reduce file size, NDI High Bandwidth preserves virtually all of the original image data while using only the compression necessary to make network transmission practical. The result is video that is functionally indistinguishable from the uncompressed SDI signal coming out of the same camera.
The codec that makes this possible is SpeedHQ — an intra-frame compression format where every frame is compressed independently, with no reference to surrounding frames. Because each frame contains its complete image data, a receiver can decode and display it immediately without waiting for additional reference information. This is what enables NDI High Bandwidth's defining performance characteristic: latency of less than one frame — typically under 16ms at 1080p60 — fast enough to be effectively invisible in a live production context.
LATENCY
<16ms
Sub-frame end-to-end
TYPICAL BITRATE
150
Mbps
1080p60 Stream
COLOR DEPTH
10
bit
4:2:2 Color Support
Visually Lossless Image Quality
NDI High Bandwidth operates at 100–150 Mbps for 1080p60, scaling to 250 Mbps or more for 4K60. To put that in context, a standard streaming video might use 5–15 Mbps; NDI High Bandwidth carries ten to fifty times that data rate, preserving color accuracy, edge sharpness, and fine detail at a level that is indistinguishable from uncompressed SDI to the human eye. For productions where image quality is non-negotiable — broadcast output, large-venue IMAG screens, color-critical monitoring — this is the relevant standard.
Sub-Frame Latency
The latency of an NDI High Bandwidth stream at 1080p60 is typically under 16ms — less than a single frame at that frame rate. In practice, this means that what the camera sees and what appears on the production monitor or switcher output are effectively simultaneous. For live applications where timing precision matters — multi-camera switching, large-screen audience display synchronized with live audio, or fast-motion sports replay — this level of latency is what separates a system that feels immediate from one that feels slightly behind.
Why "Intra-Frame" Matters:
The Secret Behind Low Latency
NDI High Bandwidth's low latency isn't a marketing claim — it's a direct consequence of how the video is compressed. Understanding the difference between intra-frame and inter-frame compression makes it clear why some video formats can be switched live without hesitation, and others can't.
Two Ways to Compress Video
Every video compression system faces the same fundamental challenge: raw video contains an enormous amount of data, and transmitting or storing all of it is expensive. The solution is to find and remove redundancy — information that doesn't need to be stored explicitly because it can be inferred from something else.
There are two fundamentally different approaches to doing this:
Inter-frame compression looks for redundancy across multiple frames. If a background stays the same from one frame to the next, there's no need to store it again — only the parts that changed need to be recorded. This is how most consumer video formats work: H.264 and H.265, the codecs used in streaming services, YouTube, and most cameras, all use inter-frame compression. The efficiency gains are significant — bitrates drop dramatically — but there's a structural cost. To decode any given frame, the decoder may need information from frames that came before it, and sometimes frames that come after it. It has to wait until it has enough reference data before it can produce a complete image.
Intra-frame compression takes the opposite approach. Each frame is compressed entirely on its own, with no reference to any other frame. SpeedHQ, the codec NDI High Bandwidth uses, works this way. Every frame is a self-contained unit — complete, decodable, and displayable the moment it arrives. There is no waiting for reference frames, no buffering, no dependency on what came before.
Why This Matters for Live Production
The practical consequence of intra-frame compression is immediate: a receiver can display each frame the instant it arrives, without needing to accumulate a buffer of surrounding frames first. This is what produces sub-frame latency.
Inter-frame compression introduces what engineers call decoder latency — the time the decoder spends waiting for enough reference frames to reconstruct the current one. In a consumer streaming context, this is invisible: a few hundred milliseconds of buffering doesn't affect the viewing experience. In a live production context, it's a different situation entirely.
Consider a technical director cutting between cameras on a live switcher. If the incoming signals have 200ms of decoder latency, the image on the monitor is already 200ms behind what the camera is actually seeing. That delay affects the timing of every cut, every graphic overlay, every piece of audio that needs to be synchronized with the image. It's the difference between a production that feels immediate and one that feels like it's running slightly behind itself.
NDI High Bandwidth eliminates this problem at the source. Because SpeedHQ compresses each frame independently, there is no decoder latency to accumulate. The signal arrives and displays in under 16ms — close enough to real time that it has no practical effect on production timing decisions.
A Simple Way to Think About It
Imagine two ways of writing a book. In the first version, every page is complete and self-contained — you can open it to any page and read it immediately. In the second version, some pages say "same as page 1, except change paragraph 3" — more efficient in terms of space, but you have to find page 1 before you can read any page that references it.Intra-frame compression is the first book. Inter-frame compression is the second. NDI High Bandwidth uses the first approach, which is why it can be decoded and displayed immediately, frame by frame, as each one arrives.
NDI High Bandwidth vs. NDI HX:
What's the Real Difference?
NDI High Bandwidth and the HX variants are not competing products — they are different tools designed around different priorities. Choosing between them is not a question of which one is better, but which one is the right fit for a specific production environment and network infrastructure.
The Core Design Philosophy
NDI High Bandwidth is built around a simple principle: deliver the highest possible image quality with the lowest possible latency, and let the network infrastructure handle the bandwidth requirement. It does not attempt to be efficient with bandwidth — it uses what the signal needs.
The HX variants invert that priority. They are designed to work within the constraints of networks that cannot support the bandwidth NDI High Bandwidth requires — whether that's a network shared with other traffic, a remote connection with limited capacity, or a deployment with too many concurrent streams for a gigabit network to carry. The compression they use reduces bandwidth significantly, but introduces latency as a structural consequence of how inter-frame codecs work.
This is not a flaw in the HX formats. It is the designed tradeoff. HX3 minimizes that latency penalty while still achieving meaningful bandwidth reduction. HX2 accepts higher latency in exchange for dramatically lower bitrates.
Side-by-Side Comparison
The Decision in One Line
If your network can support the bandwidth and your production requires live switching — NDI High Bandwidth.
If bandwidth is constrained but latency still matters — HX3.
If bandwidth is the primary constraint and latency is acceptable — HX2.
What NDI High Bandwidth Actually Replaces in a Production Workflow
Understanding what NDI High Bandwidth is technically is one thing. Understanding what it changes in a real production setup is another. This section looks at what NDI High Bandwidth practically replaces — and what that means for how a production is built and operated.
1. SDI Cables and Dedicated Video Infrastructure
The most direct replacement NDI High Bandwidth offers is the SDI cable. In a traditional multi-camera setup, each camera requires its own dedicated coaxial SDI run from the camera position to the switcher — one cable per signal, routed through walls, floors, or cable trays, each terminating at a dedicated SDI input on the switcher or router.
NDI High Bandwidth replaces that model with a network connection. A camera with NDI High Bandwidth support sends its video signal over ethernet — the same infrastructure already running through most buildings for internet and data. The switcher, running compatible software or hardware, receives that signal over the network without a dedicated video cable. For venues with existing ethernet infrastructure, this means camera positions can be placed anywhere a network port exists, without the cost or disruption of running dedicated video cabling.
2. Hardware Capture Cards
In a software-based production workflow — using applications like vMix, OBS with NDI plugins, or Resolume — bringing a camera signal into the production computer traditionally requires a capture card: a hardware device that converts an SDI or HDMI signal into data the computer can process.
NDI High Bandwidth eliminates this requirement. A compatible camera on the same network appears as a source directly in NDI-compatible software, without any intermediate hardware. The signal is already in a format the software can receive and process natively. For productions built around software switchers, this removes a category of hardware from the signal chain entirely.
3. Single-Direction Signal Flow
Traditional SDI infrastructure is point-to-point and unidirectional — a cable carries one signal in one direction. Getting a return feed back to a camera position for talent monitoring requires a separate cable run in the opposite direction.
NDI operates on a network, where bidirectional communication is inherent. A camera sending NDI High Bandwidth to a switcher can simultaneously receive a program return feed, a prompter feed, or a confidence monitor signal over the same network connection. The infrastructure that carries the outgoing video signal also carries everything coming back — without additional cabling.
4. The Practical Limit
None of this eliminates the need for infrastructure planning. A gigabit network running five or six NDI High Bandwidth streams at 1080p60 is operating near its practical capacity. Mixing NDI High Bandwidth traffic with general office or venue network traffic on the same infrastructure creates congestion that affects video reliability. The standard recommendation — and the one that makes NDI High Bandwidth genuinely comparable to SDI in terms of operational reliability — is a dedicated AV network, isolated from general data traffic, with a managed switch that can prioritize video packets.
Within those parameters, NDI High Bandwidth delivers what SDI delivers, over infrastructure that most venues already have or can install at significantly lower cost than dedicated video cabling.
For productions using Telycam’s Explore and Explore SE cameras with native NDI High Bandwidth support, video sources can be discovered directly on the network after connection, enabling seamless integration with compatible switchers and production software without the need for external conversion devices.
Network Requirements: What You Actually Need
NDI High Bandwidth performs like broadcast infrastructure when the network supporting it is built like broadcast infrastructure. The most common source of NDI reliability problems — dropped frames, stuttering video, intermittent signal loss — is not the protocol itself. It's a network that wasn't designed to carry the load.
This section covers what a reliable NDI High Bandwidth network actually requires, and the mistakes that most commonly cause problems in practice.
The Baseline: Gigabit Ethernet
NDI High Bandwidth requires a minimum of gigabit ethernet (1 GbE) — a 1000 Mbps network connection — at every point in the signal chain. This means the camera, the switch, the cables between them, and the receiving device all need to support and operate at gigabit speeds. A single 100 Mbps link anywhere in the chain creates a bottleneck that limits the entire connection to that speed — which is not sufficient for even a single 1080p60 NDI High Bandwidth stream.
In practice, this means verifying that:
• The camera's ethernet port operates at gigabit speeds
• The network switch supports gigabit on every port being used
• The patch cables are Cat6 or higher. Cat5e technically supports gigabit speeds, but under the sustained high-bandwidth load of NDI High Bandwidth streams, it is more susceptible to electromagnetic interference and can introduce micro-packet loss that disrupts video reliability. For new installations, Cat6 is the practical minimum. For PTZ camera deployments using PoE power delivery, Cat6A is the stronger recommendation — its thicker conductors handle both the higher data rates and the heat generated by PoE power delivery more reliably than Cat6.
• The receiving computer or hardware switcher has a gigabit network interface
How Many Streams Can a Gigabit Network Handle?
A gigabit network has 1000 Mbps of theoretical capacity. In practice, the safe operating threshold is around 80% of that — approximately 800 Mbps — to leave headroom for network overhead and prevent congestion-related packet loss.
At 150 Mbps per 1080p60 stream, a gigabit network running at 80% capacity can reliably handle five to six concurrent NDI High Bandwidth streams. Beyond that, the network begins to saturate, and video quality becomes unreliable.
For productions that need more concurrent streams — or that need to run 4K at 250 Mbps per stream — a 10 gigabit ethernet (10 GbE) network is the practical upgrade path. 10 GbE provides ten times the capacity of a gigabit network, allowing significantly more concurrent streams or higher-resolution sources without congestion.
Dedicated AV Network vs. Shared Infrastructure
This is the single most important infrastructure decision for NDI High Bandwidth reliability. Running NDI video traffic on the same network as general office or venue data traffic — internet browsing, file transfers, cloud backups, VoIP calls — creates competition for bandwidth that can cause video to stutter or drop frames unpredictably.
The standard practice for professional NDI deployments is a dedicated AV network: a separate network infrastructure, or at minimum a separate VLAN on a managed switch, that carries only video traffic. General data traffic stays on its own network. The two don't compete for the same bandwidth.
This doesn't necessarily mean running entirely separate physical cabling — a managed switch with proper VLAN configuration can provide logical separation on the same physical infrastructure. What it does mean is that the network carrying NDI High Bandwidth traffic should be treated as production-critical infrastructure, not as a general-purpose data connection.
Managed Switches vs. Unmanaged Switches
Not all network switches are appropriate for NDI High Bandwidth deployments. Consumer-grade and unmanaged switches — the kind commonly used in home networks and small offices — lack the configuration options needed to prioritize video traffic and handle the sustained high-bandwidth load that NDI High Bandwidth produces.
A managed switch provides several capabilities that matter for NDI:
QoS (Quality of Service): The ability to prioritize video packets over other traffic types, ensuring that NDI streams are not delayed by lower-priority data when the network is under loadI
GMP Snooping: A feature that manages multicast traffic efficiently, preventing NDI streams from being broadcast to every port on the switch regardless of whether that port has a receiver subscribed to the stream
Port-level monitoring: The ability to see traffic levels per port, which makes diagnosing bandwidth problems significantly easier
For any NDI High Bandwidth deployment beyond a single camera to a single receiver, a managed switch is the correct infrastructure choice.
Real-World Scenarios Where NDI High Bandwidth Makes Sense
NDI High Bandwidth is not a universal solution — it performs well within a specific set of conditions, and understanding those conditions is what determines whether it's the right choice for a given production. The following scenarios represent the environments where its combination of image quality and low latency delivers genuine operational value.
Multi-Camera Studio and Live Switching
This is the core use case NDI High Bandwidth was designed for. A studio with multiple cameras — whether three PTZ cameras in a house of worship, six cameras in a corporate broadcast facility, or a university lecture capture setup — can replace SDI infrastructure with a dedicated gigabit network, connecting each camera directly to a hardware or software switcher over ethernet.
The operational benefit goes beyond cabling simplicity. In a traditional SDI studio, adding a camera means running a new SDI cable. In an NDI High Bandwidth studio, adding a camera means connecting it to the network — the same infrastructure that's already in place. For permanent installations that expect to evolve over time, this flexibility has real long-term value.
Houses of Worship
Houses of worship represent one of the most common NDI High Bandwidth deployment environments, and for good reason. The typical production profile — multiple fixed camera positions, a weekly live stream, a small or volunteer production team — aligns closely with what NDI High Bandwidth offers: broadcast-quality video over existing ethernet infrastructure, with minimal operational complexity once the system is configured.
The ability to monitor and control cameras from a central location over the same network that carries the video signal simplifies the production workflow significantly. A single operator can manage multiple NDI-capable PTZ cameras, receive their feeds on a software switcher, and output the program stream — all from one network-connected workstation.
Corporate and Hybrid Events
Hybrid meeting environments — where part of the audience is in the room and part is remote — benefit specifically from NDI High Bandwidth's low latency and bidirectional network capability. Cameras send high-quality video to the production system over ethernet; return feeds, presentation slides, and remote participant windows travel back over the same infrastructure. The result is a production environment that can be assembled and reconfigured quickly without dedicated video cabling for each source.
For corporate events in venues with existing ethernet infrastructure, NDI High Bandwidth allows broadcast-grade production quality without the cost or logistics of deploying SDI equipment.
Software-Based Production Workflows
Productions built around software switchers — vMix, OBS with NDI plugins, TriCaster, Wirecast, or similar applications — benefit directly from NDI High Bandwidth's native software compatibility. Compatible cameras appear as sources in the software without capture cards or intermediate hardware, and the software can output NDI High Bandwidth streams to monitors, recorders, and other devices on the same network.
For content creators and small production teams working with software-based tools, this removes a layer of hardware that would otherwise be required to get camera signals into the production computer.
FAQ
Conclusion
NDI High Bandwidth is not the newest version of NDI, nor the most bandwidth-efficient. It is the version that makes the fewest compromises on image quality and latency — and that distinction is what makes it the right foundation for productions where those two things are non-negotiable.The shift it represents is significant. Broadcast-grade video transmission no longer requires dedicated coaxial infrastructure, specialized video cabling, or hardware conversion at every stage of the signal chain. A standard gigabit ethernet network, properly configured and dedicated to AV traffic, can carry the same quality of signal that SDI carries — with the added flexibility of a network architecture where sources are discoverable, bidirectional, and not bound to a fixed physical path.
That flexibility comes with real infrastructure requirements. A shared office network is not a substitute for a dedicated AV network. An unmanaged consumer switch is not a substitute for a managed switch with QoS configuration. Cat5e patch cables are not a substitute for Cat6 or Cat6A in a PoE PTZ deployment. The protocol delivers broadcast-grade results when it runs on broadcast-grade infrastructure — and produces unreliable results when it doesn't.
For productions that fall within those parameters — a dedicated network, a local facility, five or six cameras at 1080p60 or fewer at 4K — NDI High Bandwidth delivers what it promises. Telycam's Explore and Explore SE PTZ cameras support native NDI High Bandwidth output, connecting to that infrastructure without additional conversion hardware and appearing as sources the moment they're on the network.
The underlying principle is straightforward: network video has reached the point where the transmission medium is no longer the limiting factor. What matters now is whether the network supporting it is built to the same standard as the production it's carrying.
