Description

Model 2253 is a compact and robust USB-compatible audio/video codec that is powered from a single USB port. Its small size (1.5" x 2.75") and low power consumption (1.5 Watts) make it ideal for both portable and embedded applications.

Encoder

The unit is capable of simultaneously producing two different video streams from its single composite input and sending 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 resolution is independently configurable for each stream, as well as compression type and bit rate in the case of compressed streams.

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

Up to 1024 bytes of application-supplied data may be inserted in the H.264 or MPEG stream, at a specified frame interval or single shot.

Audio

The 2253 implements hardware-generated timestamps to keep audio synchronized to the video, thus eliminating "lip sync" problems.

Text Overlay

Up to 80 characters of overlay text may be positioned anywhere in the video frame prior to compression.

Digital I/O

One general purpose digital input and one output are provided. The output is optically isolated, while the input may be either optically isolated or galvanically coupled. The input is sampled every millisecond and, when a state change is detected, a notification is sent to the application program.

Image Overlay

Overlay images can be displayed on top of the composite video output. The overlayed video may be sourced from either the composite video input or a decoded compressed stream. Image formats supported are Windows bitmap (BMP) and Portable Network Graphics (PNG), with 24 or 32 bits per pixel. Overlays support 7 transparancy levels.

Example of the 2253 overlay capabilities (captured from 2253 composite output)

Decoder

The 2253 can also perform as a decoder, converting a USB-supplied compressed audio/video stream into standard analog video and audio signals. (Decoding is guaranteed only for streams captured with the 2253). The following formats are supported for decoding: MPEG-4 (.m4v), H.264 (.264 or .h264), MP4 (.mp4) and MJPEG (.mjpg or .mjpeg).

Ultra-low latency preview

Model 2253 supports an ultra-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.

2253 Latency

Pending Feature - Transport Stream

The codec will generate a standard format for transmission and storage of audio, video and program data that is used in broadcast systems such as DVB and ATSC.

Packaging Options

Model 2253S features a sturdy metal enclosure with video, audio, USB and GPIO connectors

Also available: Model 2253 is a bare-board version of Model 2253S for OEM applications

Specifications

Inputs	Video: NTSC/PAL composite, 75 Ohm; Audio: line stereo, microphone mono.
Outputs	Video: NTSC/PAL composite, 75 Ohm; Audio: line stereo
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
Video preview format	640x480@ 30 fps (NTSC); 720x576@25 fps (PAL); YUV4:2:2, GREY8, or JPEG
Text Overlay	Up to 80 characters for full resolution images
Video Overlay (upcoming SDK)	Windows BMP and PNB with 24 or 32 bits/pixel 8-bit red, blue, green and 8-bit transparency channel
Interface	USB 2.0 High-speed
Power consumption	<1.5 W (300 mA @ 5 V) from USB port
Operating temperature	0 to 70 C (-40 - +85 C version available)
Dimensions	2253: 2.755" x 1.5" 2253S: 5.14" x 3.28" x 1.14"

Documentation

File	Version	Type	Size	Last Updated
Manuals
2253 Hardware Manual	1.1.1	PDF	438 KB	2 Mar 2011
2253 Linux Software Manual	1.2.2	PDF	396 KB	24 Jan 2012
2253 Windows Software Manual	1.2.1	PDF	628 KB	30 Sep 2011
Mechanical Drawings
Mechanical drawing, 2253	n/a	PDF	22 KB	23 Jul 2010
Mechanical drawing, 2253 mounted on 2253TA	n/a	PDF	97 KB	23 Jul 2010
Mechanical drawing, 2253S	n/a	PDF	518 KB	24 Aug 2010

Downloads

File	Version	Type	Size	Last Updated
2253 Linux Software Development Kit	1.2.2	BZ2	5.04 MB	24 Jan 2012
2253 Windows Software Development Kit	1.2.1	ZIP	11.48 MB	30 Sep 2011

Prices

Model	Description	Qty 1	Qty 2-9
2253	USB Audio/Video Codec	$299	$272
2253S	USB Audio/Video Codec with Enclosure	$364	$337
2253-ET	USB Audio/Video Codec, Extended Temperature (-40-+85°C)	$319	$292
2253S-ET	USB Audio/Video Codec with Enclosure, Extended Temperature (-40-+85°C)	$388	$349