The codec model 2412 from Sensoray Co. Inc. converts PAL or NTSC video into an mpeg-1 or -2 elementary stream via the user datagram or real-time Ethernet protocols. Images of 320 x 240 pixels are encoded into mpeg-1; interlaced images of 640 x 480 pixels and higher, into mpeg-2. A motion estimation algorithm eliminates blurring during compression of scenes that contain motion. Features include composite and S-video input and output, three digital input/output signals and two RS-232 ports for controlling pan-zoom-tilt cameras, an optional enclosure and a Windows stream player for viewing data with <1 s of latency. It can be expanded to four video channels by adding model 512 codec boards. The three-board device has an embedded Linux Web server for reliability, fast response and easy configuration.