Portable USB Audio/Video Codec Device

Published:2011/9/28 7:00:00 Author:Amy From:SeekIC

The Sensoray Model 2253, a USB-compatible audio/video codec, can simultaneously generate two video streams from a single video input. The device is 38 x 70 mm in measurement and 1.5 watts in consumption. It is ideal for use in portable and embedded application.

One video streams may not be compressed and the other one is compressed, or both streams are compressed. Along with compression type and bit rate in the case of compressed streams, image resolution is independently configurable for each stream. Video and audio as elementary streams are available and can be multiplexed in MP4 container format.

1024 bytes of application-supplied data is built in the H.264 or MPEG stream at a specified frame interval or as a one-time event. The Model 2253 implements hardware-generated timestamps to keep audio synchronized to the video, eliminating "lip sync" problems. Up to 80 characters of overlay text may be positioned anywhere in the video frame prior to compression. The unit supports H.264 HP@L3, MPEG-4 ASP and MJPEG for video compression as well as AAC and G.711 audio compression plus uncompressed PCM.

It offers one general purpose digital input and one output. The output is optically isolated, and the input is 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.

Future SDK versions will support for image overlay on top of the compressed video, adopting images in Windows Bitmap (.bmp) or Portable Network graphics (.png) format with 24 or 32 bits per pixel and seven transparency levels, along with audio/video decoding from the USB port to the analogue output and low-latency preview.

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