Technical Requirements
The following technical requirements are specific to each NDI format, but if a device can support more than one format, it will be certified and tested under both types separately.
In addition to the following technical requirements, Interoperability Requirements must be followed.
NDI High Bandwidth
The specific criteria for NDI High Bandwidth certification are:
I Frame only for Keyframe
Less than 100ms latency
SpeedHQ codec
| Resolution Supported | Framerates |
|---|---|
2160p | 60fps, 50fps, 30fps, 25fps |
1080p | 60fps, 50fps, 30fps, 25fps |
720p | 60fps, 50fps, 30fps, 25fps |
480p | 30fps, 25fps |
| Codec | Supported Bit Depth | Chroma Subsampling | Color Space |
|---|---|---|---|
H.264 | 8bit | 4:2:0 | YUV(A) |
H.265 HEVC | 8bit | 4:2:0 | YUV(A) |
NDI HX2
This certification is for products that support NDI HX2 but cannot pass the technical certification requirements of NDI HX3. Critically, they still pass the Interoperability requirements. These devices may have slower latency or keyframe or a larger GOP. The key criteria are:
150ms glass-to-glass latency
Keyframe response time under 80ms
Current SDK or previous SDK (6.0 currently, 5.6 previous as of this writing)
H.264 or H.265 encoding
| Resolution Supported | Framerates |
|---|---|
2160p | 60fps, 50fps, 30fps, 25fps |
1080p | 60fps, 50fps, 30fps, 25fps |
720p | 60fps, 50fps, 30fps, 25fps |
480p | 30fps, 25fps |
| Codec | Supported Bit Depth | Supported Chroma Subsampling | Color Space |
|---|---|---|---|
H.264 | 8bit | 4:2:0 | YUV(A) |
H.265 HEVC | 8bit | 4:2:0 | YUV(A) |
NDI HX3
This certification is for products supporting NDI HX3 that fit one of the following criteria:
Encoder
H.264 or H.265 encoding
GOP setting set to 20
Video compression set to low latency
Latency
100ms Glass-to-glass Latency
Keyframe response time under 80ms
Compression
Quality: no visible compression artifacts
Compression: constant bitrate (CBR)
| Resolution Supported | Framerates |
|---|---|
2160p | 60fps, 50fps, 30fps, 25fps |
1080p | 60fps, 50fps, 30fps, 25fps |
720p | 60fps, 50fps, 30fps, 25fps |
480p | 30fps, 25fps |
| Codec | Supported Bit Depth | Supported Chroma Subsampling | Color Space |
|---|---|---|---|
H.264 | 8bit | 4:2:0 | YUV(A) |
H.265 HEVC | 8bit | 4:2:0 | YUV(A) |
NDI HX1 is a legacy format that will be discontinued over time. As such we are not certifying devices that support this format. Contact our technical support team if you have any questions.
NDI 6 Optional Features
HDR
With NDI 6, HDR is now officially supported as a sender and receiver for NDI HX3 and NDI High Bandwidth. To qualify under either, the following must be met:
HDR optional toggle - not every receiver is HDR compatible, and NDI strives for forward and backward compatibility. HDR must be allowed to turn off at the end user's request
BT_2020 or BT_2100 primaries (as defined in the SDK for HDR)
10 and 12-bit video
NDI Bridge
With NDI 6, NDI Bridge functionalities can now be embedded into a device or application to connect across networks, even across the public Internet, easily. As this is a connection method rather than a quality metric, certification will depend on the ability to implement the following:
NDI Bridge optional toggle - Bridge must be enabled or disabled at the end user's request
Fields to enter IP, port, username, and password
Connection success or failure messaging
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