NDI Video Codecs and Format Matrix

Updated as of NDI 5.6

NDI High Bandwidth

Codec	Supported Bit Depth	Supported Chroma Subsampling	Supported Color Space
SpeedHQ0	8bit	4:2:0	YUV
SpeedHQ2	8bit	4:2:2	YUV
SpeedHQ7	8bit	4:2:2:4 (with Alpha Channel)	YUVA

NDI HX (v1) (1)

Codec	Supported Bit Depth	Supported Chroma Subsampling	Supported Color Space
H.264	8bit	4:2:0	YUV

(1) An SoC, or System on Chip, is an integrated circuit (IC) that integrates all components of a computer or other electronic system into a single chip. It may include a central processing unit (CPU), memory (RAM, ROM, and flash memory), input/output ports, and secondary storage – all on a single substrate or microchip. It can also contain other components such as a graphics processing unit (GPU), a network interface for communications, and specialized hardware accelerators for specific tasks like digital signal processing (DSP), encryption, or A/V Codecs.

NDI HX (v2)

Codec	Supported Bit Depth	Supported Chroma Subsampling	Supported Color Space
H.264	8bit	4:2:0	YUV (A)
H.265	8bit	4:2:0	YUV (A)

NDI HX3

Codec	Supported Bit Depth	Supported Chroma Subsampling	Supported Color Space
H.264	8bit	4:2:0	YUV (A)
H.265	8bit	4:2:0	YUV (A)

NDI offers Alpha Channel support with both H.264 and H.265 (YUVA 4:2:0:4).

Since Alpha Channel is not officially supported by H.264 and H.265, this feature is restricted to software applications like NDI Bridge, TriCaster, Vectar Plus, and Connect from Vizrt. It is implemented by vertically stacking the video and alpha frames into a single frame before compression.