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:

Interoperability requirements
I Frame only for Keyframe
Less than 100ms latency
SpeedHQ codec

Resolution Supported

Framerates

Codec

Supported Bit Depth

Chroma Subsampling

Color Space

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:

Interoperability requirements
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

NDI HX3

This certification is for products supporting NDI HX3 that fit one of the following criteria:

Interoperability requirements

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)

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

Last updated 5 months ago