> For the complete documentation index, see [llms.txt](https://docs.ndi.video/all/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ndi.video/all/using-ndi/ndi-for-video/ndi-video-codecs-and-format-matrix.md).

# NDI Video Codecs and Format Matrix

## **NDI High Bandwidth**

<table data-full-width="true"><thead><tr><th>Codec</th><th>Supported Bit Depth</th><th>Supported Chroma Subsampling</th><th>Supported Color Space</th></tr></thead><tbody><tr><td>SpeedHQ0</td><td>8bit</td><td>4:2:0</td><td>YUV</td></tr><tr><td>SpeedHQ2</td><td>8bit - 10bit</td><td>4:2:2</td><td>YUV</td></tr><tr><td>SpeedHQ7</td><td>8bit - 10bit</td><td>4:2:2:4</td><td>YUVA</td></tr></tbody></table>

### &#x20;**NDI HX 1**

<table data-full-width="true"><thead><tr><th>Codec</th><th>Supported Bit Depth</th><th>Supported Chroma Subsampling</th><th>Supported Color Space</th></tr></thead><tbody><tr><td>H.264</td><td>8bit</td><td>4:2:0</td><td>YUV</td></tr></tbody></table>

> **(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 2 - 3**

<table data-full-width="true"><thead><tr><th>Codec</th><th>Supported Bit Depth</th><th>Supported Chroma Subsampling</th><th>Supported Color Space</th></tr></thead><tbody><tr><td>H.264</td><td>8bit</td><td>4:2:0</td><td>YUV (A)</td></tr><tr><td>H.265</td><td>8bit - 10bit</td><td>4:2:0</td><td>YUV (A)</td></tr></tbody></table>

{% hint style="info" %}
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.
{% endhint %}


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