Ultra Low Latency Smart-telecaster Zao-X

0.04 seconds latency changing the game in live video transmission




Zao-X For Live Streaming

Cutting edge technology that enables encrypted live streaming and real-time remote control with glass-to-glass latency from 35ms worldwide. From live broadcasts to mobile surveillance and remote control of drones, robots, vehicles, and machinery, achieve seamless control and operation

The Zao-X is an H.265 HEVC encoder that can be used in a variety of wireless video streaming and remote control scenarios.

The Zao-X is a hardware transmitter for cellular that can stream fully encrypted live video. Simultaneously, a return data feed can be sent back from the operations center, enabling various operations such as controlling a 4G-enabled surveillance PTZ or broadcast camera, or remote control of a device that relies on a real-time operator such as a robot, drone or vehicle.

The Zao-X can reliably live stream over multiple bonded 4G and 5G SIM cards from different network providers. Additionally, it can support Wi-Fi and LAN connectivity.

At the receiving end, a Windows, Linux, or cloud based software decoder will provide a video output of the live video. End to end latency starts at a remarkable 0,04s.

If you are interested in the software OEM encoder, please click Zao-SDK

4K UHD Support

4x resolution of HD, Zao-X has full support of 4K live streaming (with Linux decoder).

Soliton 4K Web Picture-2
Diagram 4-03

The period from when the light enters the lens of the camera until video data is on the output of the SDI/HDMI terminal on the camera

The period from capturing video data from SDI/HDMI and performing color space conversion until it is input to the encoder

The encoding (compression) time

The period in which compressed data is extracted from the encoder and divided into communication packets for multilink transmission/reception. Includes time for error correction and packet sorting between each connection

The period in which compressed data is extracted from the encoder and divided into communication packets for multilink transmission/reception. Includes time for error correction and packet sorting between each connection

The decoding (uncompression) time

AV Sync
The time until adjusting audio and video timing and outputting to SDI/HDMI

The period from SDI/HDMI output of the receiver to display the video on monitor (monitor-dependent part)

Zao-X Features


Low Latency / RASCOW 2

Ultra Low Latency

RASCOW2 (Real-time Auto Speed Control based On Waterway-model) is Soliton’s second generation codec for video optimization. It ensures fast and highly reliable adaptive encoding that is optimized on available network bandwidth, even in the most challenging of situations. 

remote drivin small-1

Remote Control


Zao-X enables remote control of a car, robot, drone or machinery in almost real-time from a remote location. Traditional encoders have a delay greater than 0,5 second that is too long for safe control.  Zao-X can remotely control machinery, viewing a live video stream and remote operation in almost real time.

zao-X picture bonding

Stable and High Speed

Multilink Bonding

Mobile networks from different cellular telecom carriers can be bonded into one single network connection significantly increasing bandwidth and resilience. It remove the reliance on a single network operator and with RASCOW2 can deliver superior live streaming up to 4K video formats.

ZAO-X 4K Image

High Video Compression


Zao-X is a highly efficient HEVC/H.265 hardware encoder and compared to a traditional H.264 codec, transmits video with almost half the bandwidth. Soliton's H.265 process is highly efficient for encoding and decoding that is a major element in the measure of super low latency video streaming. 



Ultra Low Latency Mobile Encoder - 4K streaming over 4G and 5G


Specifications Zao - X

1. Specifications

Transmission Hardware Weight About 560g
Size Width 100 mm x height 161 mm x depth 43 mm (excluding protrusions)
Power-supply voltage 12V
Power consumption Transmission hardware Approximately 15W 
Battery External - powered via MLU device
Operating environment During operation: -5 to + 40 ° C / 10 to 95% RH
When stored: -20 to + 70 ° C / 10 to 95% RH
(no condensation)
Video input terminal
(including Embedded audio)
3G-SDI BNC x 1 / HDMI2.0 x 1
Audio1 input / output terminal
USB audio
USB terminal USB2.0 TypeA x 2
Built-in ether RJ-45 type jack x 1
Encryption AES 256bit
Maximum Bitrate 32Mb/sec

Number of supported lines Up to 6 lines
Corresponding line 4G / 5G by MLU / LAN / USB-Ether
LAN port 100BaseT RJ45

Video transmission

Video Resolution 2160 (HDMI only) / 1080p/ 720p
Encoding method (Codec) HEVC H.265 (512-20Mbps) 
Encode mode ULL / Normal 
Input interface HDMI / SDI (BNC terminal) 
WWAN  External MLU device with 4 integrated LTE/ WiFi/ BT)
Audio transmission

channel Stereo / Mono (L) 
Encoding method Opus (16-320kbps)
Sampling rate Embedded (Incoming): 48kHz
External (Outgoing): 16kHz / 48kHz
Audio Interface

SDI / HDMI (input only)

USB Audio (Yamaha Speaker Mic)

Serial communication Baudrate

1200/2400/4800/9600/19200/38400/ 57600/115200

Parity  none / even / odd
Packetize Mode None / COBS
LAN tunneling Internet protocol IPv4
packet TCP / UDP / ICMP
Receiving system Receiving system


Zao View

HD View V5


2. Features

Utilizes RASCOW2 for optimization of video quality based on available bandwidth
      • New Uplink protocol updated from RASCOW for better performance
      • Multilink and Lower Latency
      • Fault tolerance mode – Lower Latency, but requires bandwidth
      • Load balancing mode – Slightly Longer Latency, requires less bandwidth
        • Encrypted live streaming over multiple bonded 4g SIM cards and /or LAN port
        • Support Serial Tunneling - return feed for serial control eg PTZ or drone gimbal
        • Zao View
      • Newly Linux based decoder
      • 1 Channel Receiver /Planning for 4 Channel
      • Required Ubuntu workstation:
        • HP Z4G4 + NVIDIA RTX4000 (+BMD Decklink Pro 8K)
      • Point to Point connection (no cloud subscription required)
      • Decoder must have fixed IP address
        UDP port :TBD (current version is same as Zao-S)


        Ultra Low Latency Performance

3. Serial Control

  • Support Serial Tunneling
  • Same implementation as Zao-S and HDView
  • Remote control use case

PTZ Camera

Drone Gimbal

Remote Driving (Actuator for connected car)

Zao View Decoder

Zao View Decoder

Zao View is a single channel 4K software decoder for the receiving end compatible with the "Smart-telecaster Zao-X" mobile encoder. It provides ultra-low latency performance and supports serial tunneling and LAN tunneling functions that are ideal for remote control systems. Operates on a Linux workstation.


HDView decoder v5 website

HDView Decoder v5

Software decoder utilized Soliton's conventional products such as "Smart-telecaster Zao / Zao-S" and the latest model "Smart-telecaster Zao-X". Capable of receiving up to 4 x HD channels simultaneously. It also supports SDI / HDMI output of received video and IP outputs including NDI, RTMP, RTSP. It can be used by upgrading the version of "Smart-telecaster HD View" currently in use.

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