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XStream-SD4 - Ultra Low Latency Standalone 4xD1 H.264 Video Streamer

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The XStream-SD4 is an intelligent, stand-alone, ultra low latency H.264 Streaming solution that accepts 4x NTSC/PAL/RS-170 composite video sources and records and streams them over 100/1000MBit Ethernet. This SWaP optimised solution is ideal for rapid deployment in demanding applications in Military, Communications, Transportation, Mining and Energy industries.

The XStream-SD4 features a dedicated hardware compression engine capable of encoding all 4 video channels at full size and full frame-rate with Ultra Low Latency (under 40ms). The flexible streaming engine can stream each channel direct from the on-board Ethernet port as well as save direct to locally attached storage for later retrieval. The XStream-SD4 also supports 4 channels of audio that can be captured and streamed with the video data.

The XStream-SD4 is an intelligent stand-alone device with its own on-board CPU and does not require a host CPU or any driver or OS software. For mechanical convenience the module can be mounted on a PC/104 stack without consuming host CPU resources.



  • 4x PAL/NTSC/RS-170 composite video inputs
  • Real-time 4x D1 H.264 encode at full frame rate
  • Ultra Low Latency technology with video latency below 40ms
  • 4 channels of audio encoding
  • H.264/MPEG-4 AVC (Part 10) Encoder
  • Single, rugged, real-time video streaming solution
  • SATA support for extended local storage
  • Stand-alone operation
  • Operating system neutral
  • Standard PC/104 mechanical form factor

Relevant Applications

  • Real-time video feedback for remote platforms
  • Unmanned vehicles (UAV, ROV)
  • Real-time IP video distribution
  • Remote Video Surveillance
  • All-round Real-Time Situational Awareness
  • Rapid Deployment Video Recording solutions
  • Rugged video recorders for marine, aviation
  • Border Security
  • Traffic Monitoring and Control
  • Video Acquisition and Analytics

Block Diagram

Analog Video Input

  • Up to 4 concurrent PAL / NTSC / RS-170 composite video inputs
  • Four 10bit Analog-to-Digital converters
  • Anti-aliasing filter on inputs

Audio Input

  • 4x mono inputs
  • Provides audio/video synchronization

H.264 Video Encoding

  • ITU-T H.264 (ISO/IEC 14496-10), supported profiles:
    Baseline profile
    Main profile (I,P frame coding only)
    High profile (I, P frame coding only) at level 4.1
  • 4x D1 encode @ full frame rate
  • Supports Variable Bit Rate (VBR)
  • Supports Constant Bit Rate (CBR)
  • Real-time multi stream H.264 Ultra Low Latency capture

Ultra Low latency

  • Less than 40ms video encode latency

Network Interface

  • 100/1000MBit Ethernet for RTSP/RTP streaming and control

Data Storage

  • SATA - For external storage
  • SD-Card slot - On-board storage


  • Intelligent stand-alone module, does not require host computer
  • Standard 4.55 x 3.775in PC/104 form factor
  • Mechanical mounting for PC/104 stack
  • Single +5V supply
  • Operating temp -40 °C to +85 °C (extended temp option)

The following order codes can be used when ordering the XStream-SD4

XStream-SD4-EXT - H.264 Ultra Low Latency Video Streamer (-40 °C to +85 °C)

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