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SENSORAY Model 2253P A/V MPEG-4,MJPEG,H.264 codec with GPS and incremental encoder interfaces

SENSORAY Model 2253P A/V MPEG-4,MJPEG,H.264 codec with GPS and incremental encoder interfaces
SENSORAY Model 2253P A/V MPEG-4,MJPEG,H.264 codec with GPS and incremental encoder interfaces SENSORAY Model 2253P A/V MPEG-4,MJPEG,H.264 codec with GPS and incremental encoder interfaces


  • Simultaneous encode/decode/preview in a robust, compact unit
  • Low preview latency
  • H.264 HP@L3, MPEG-4 ASP, MJPEG video compression
  • AAC, G.711 audio compression, uncompressed PCM
  • Unicode text and graphic overlay
  • Closed caption/VBI support for H.264 streams
  • GPS receiver and two incremental encoder interfaces/dual GPIO
  • Incremental encoder counts and GPS data can be overlaid onto video
  • Ideal for video pipeline inspection, radar processing and video surveillance applications

Model 2253P is a USB device that combines the functions of a model 2253 A/V codec, GPS receiver, and two multifunction ports in a compact and robust metal enclosure. All operating power is supplied by a single USB port.

Each multifunction port can operate as an incremental quadrature encoder interface or as dual general purpose digital inputs (GPIO). Encoder counts, GPS data, and GPIO states can be monitored over USB. Real-time encoder counts and GPS data can be overlaid onto any video stream and GPIOs can pause and start streams, all without host intervention.

SEN Model2253P diag block

Multiple, independent video processors allow the unit to simultaneously produce two different video streams from its single composite input and send the streams out over USB. One of the streams can be a low-latency uncompressed stream (useful for real time previewing) and the other compressed, or both streams may be compressed. Image transformations (resolution, rotation, mirroring) are independently configurable for each stream, as well as compression type and bit rate in the case of compressed streams.

Up to 1024 bytes of application-supplied data can be inserted in the H.264 or MPEG stream at regular frame intervals or single shot. Closed captions are supported for H.264 streams.

Multifunction Ports

Port inputs are compatible with both TTL/CMOS and differential RS-422 signals. Incremental encoders may be powered by the 2253P or an external power supply. When a port is used as dual GPIOs, the host can manually monitor GPIO states or the port can automatically send notifications over USB upon state changes. Also, each GPIO can be used to control the flow of any stream.

GPS Receiver

An integral GPS receiver produces NMEA data and sends it out over USB. If desired, the host may send GPS information back to the 2253P to be overlaid on the preview or compressed video, or the 2253P can automatically overlay GPS data onto the video in real time. Power is provided for an external active antenna through the 2253P's threaded SMA antenna connector.

Stream Formats

Video and audio are available as elementary streams or may be multiplexed in MP4 container format.

The 2253P supports transport streams by packaging elementary streams with error correction and stream synchronization to help maintain integrity when the signal is degraded. The transport stream uses AAC audio and H.264 for MPEG-4.

Audio Sync

Hardware-generated timestamps are employed to keep audio synchronized to the video, thus eliminating "lip sync" problems. MP4 files can be edited in Adobe Premiere Pro with A/V sync preserved.

Real-Time Text Overlay

The overlay generators can position up to 160 characters of text anywhere in the video frame. A unique text string, consisting of mixed constant and variable text, may be defined for each overlay generator. Text variables are automatically updated every video frame. Supported variables include time, date, GPS position, incremental encoder counts, and frame count.

Graphics Overlay with Unicode Text

Overlay images can be displayed on top of the composite video output, compressed streams, or the preview stream (but not low latency preview stream). BMP and PNG image formats are supported, with 24 or 32 bits per pixel and up to eight transparancy levels.

 SEN Model2253 overlay

High quality, styled unicode text (bold, italic, underline, outline and shadow) can be overlaid on any video stream. Up to 256 full-color overlay regions are supported on the composite output, and up to eight monochrome regions are supported for capture or preview.

Video Decoder

The 2253P can also perform as a decoder, converting a USB-supplied compressed audio/video stream into standard analog video and audio signals. (Note: Decoding is guaranteed only for streams captured with the 2253). The following formats are supported for decoding: MPEG-4, H.264, MP4 and MJPEG. The composite output video can be sourced from either the composite video input or a decoded compressed stream.

Low Latency Preview

Model 2253P supports a low latency preview mode for real-time applications. When capturing in native resolution (704x480 for NTSC or 704x576 for PAL) this mode reduces the overall latency by approximately one frame time.


Model 2253P features a sturdy metal enclosure with connectors for video, audio, USB, GPS antenna, and multifunction ports.

SEN Model2253P fb


A USB cable is supplied with model 2253P.
A GPS antenna and video cables must be purchased separately.

SEN 2253P antenna.200.133

Input 1 NTSC/PAL composite, 75 Ohm
Output 1 NTSC/PAL composite, 75 Ohm
Preview format 640x480@ 30 fps (NTSC); 720x576@25 fps (PAL); YUV4:2:2, GREY8, JPEG, RGB
Preview latency See timing diagrams below
Inputs 1 line stereo + 1 microphone mono
Software selectable (only one may be active)
Output 1 line stereo
Text Overlay Up to 160 characters for full resolution images
Video Output Overlay Up to 256 regions of BMP and PNG (with 24 or 32 bits/pixel), or unicode text.
16-bit color, 3-bit alpha channel
Video Capture Overlay Up to 8 monochrome regions of BMP and PNG (with 24 or 32 bits/pixel), or unicode text
Image transformation 2 independent image transformers:
Resize to various resolutions
Rotate 90°/180°/270°
Mirror horizontally or vertically
Encoding format Video: H.264 HP@L3, MPEG-4 ASP, JPEG;
Audio: G.711, AAC
Output stream format Elementary audio/video, MPEG-4 program stream (.MP4), MJPEG AVI, Transport Stream
Multifunction Interface
Channels 2
Operating modes 32-bit incremental encoder interface, 10 MHz maximum count rate;
Dual digital inputs with edge detection
Input signals Differential: RS-422, < 7v CMV; Single-ended: 5V TTL/CMOS compatible, w/integral 3.3 KΩ pull-up
Output power 5V for external encoder/contact loads, 100 mA maximum
Connector type RJ-45 receptacle per channel
GPS Interface
Output data Decoded: latitude, longitude, speed, heading, time, date;
Undecoded: all raw data, in conformance with NMEA 0183
Antenna type GPS active antenna (not included)
Antenna connector SMA
Interface USB 2.0 High-speed
Digital I/Os 1 input, galvanically coupled or optically isolated
1 output, optically isolated
Power consumption < 1.5 w (300 mA @ 5 V) from USB port (excluding 2253P encoder power)
Operating temperature Standard version: 0 to 70 °C
Dimensions 2253P: 5.14" x 3.28" x 1.14"
Preview Latency Timing

SEN Model2253Latency.530.550.800

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