oblock and operates at 608 lines/frame for 25 fps or 512 lines/frame for 30 fps. The Multiview Profile, which was completed in October 1996, uses existing video coding tools for providing an efficient way to encode two slightly different pictures such as those obtained from two slightly separated cameras shooting the same scene. This allows multiple views of scenes, such as stereoscopic sequences, that are coded in a manner similar to scalable bit streams. How MPEG-2 DIFFERS FROM MPEG-1 MPEG-2 is not intended to replace MPEG-1. Rather, it includes extensions to MPEG- 1 to cover a wider range of applications. MPEG-1 deals only with progressive Video Communications: The Whole Picture scanning techniques where video is handled in complete frames. The MPEG-2 standard supports both progressive scanning and interlaced displays such as those used for televisions. In interlaced video, each frame consists of two fields (half frames) that are sent at twice the frame rate. The MPEG-1 specification was targeted nominally at single speed CD ROMs (1.5 Mbytes per second). MPEG-2 is targeted at variable frame rates, including those many times higher than MPEG-1. Each of the two standards, MPEG-1 and MPEG-2, is divided into parts. MPEG-1 has five parts (listed in this document); MPEG-2 has eight, of which five are either identical to or extensions of MPEG-1 parts and three are additions. The MPEG-1 stream is made up of two layers, the system layer and the compression layer. The MPEG-2 stream is made up of program and transport streams. MPEG-2 streams are subdivided into packets for transmission. The MPEG-2 program stream is designed for use in relatively error-free environments. As such, it is similar to the MPEG-1 system stream. The MPEG-2 transport stream is designed for error-prone environments (broadcast). MPEG-1 does not have an equivalent to the MPEG-2 transport stream. Both the MPEG-1 and MPEG-2 standards define a hierarchy of data structures in the video stream. There is a group of pictures (a video sequence). The next le