NDI®|HX是第一代基带转换器和PTZ摄像机所使用的NDI协议，它是一种混合协议。设计用于在传统的IP流（如RTSP/RTP）和易于集成的NDI世界之间建立桥梁。虽然设备固件发生了变化，但构建NDI|HX的大部分工作是在接收设备HX驱动程序中完成的。
NDI®|HX2是下一代高效的NDI协议，NDI|HX2是真正的原生NDI流，从源设备一直到目的地。这意味着它是一个比NDI|HX更“干净”的实现，并且可以提供更可靠、更低的延迟和更灵活的连接，它共享NDI的所有一般特性。NDI|HX2可以通过WiFi提供类似Full NDI的画面质量。NDI延迟在很大程度上取决于发送和接收设备中的编解码器实现，但理论上可以低到几帧。
NDI/NDI|HX/NDI|HX2对比：
|
Parameter |
NDI® |
NDI®|HX |
NDI®|HX2 |
|
Transport |
TCP/UDP/Multi-TCP |
UDP (TCP) |
TCP/UDP/Multi-TCP |
|
Image Format |
Size / Aspect Independent |
Size / Aspect Independent |
Size / Aspect Independent |
|
Tally Feedback |
Yes |
Yes |
Yes |
|
Bidirectional Device Control |
Yes |
Yes |
Yes |
|
Integrated Alpha Channel |
Yes |
No |
No |
|
Compression |
NDI® Codec |
HX (H.264) |
H.264/H.265 |
|
Connection |
Socket, Unicast / Multicast and FEC |
Unicast/MultiCast |
Socket, Unicast / Multicast and FEC |
|
HD (1080i) Data Rate |
~ 100 Mbit/s |
8-20 Mbit/s |
1-50 Mbit/s |
|
Essence Packing |
Discrete Audio, Metadata and Video Frame packets, single connection |
Delivered as Discrete Audio, Metadata and Video Frame packets, single connection |
Discrete Audio, Metadata and Video Frame packets, single connection |
|
Infrastructure |
Gigabit / Load Balanced Multi NIC / 10GBit |
Gigabit / Wireless |
Gigabit / Wireless |
|
Service Discovery |
Bonjour (mDNS), NDI® Access (manual), Server (NDI®4) |
automatic via HX Driver |
Bonjour (mDNS), NDI® Access (manual), Server (NDI®4) |
|
API |
free license, SDK Libraries for Win(x86), Mac, Linux(x86 & ARM), iOS, FPGA reference |
hardware encode, Decode with NDI® Libraries |
Send with NDI® Embedded SDK, Receive with Free NDI® Libraries |