table Huffman encoding and differential PCM. As is true with all MPEG types, MPEG-1 uses I frames, P frames and B frames for temporal compression. MPEG-1 files are usually smaller than QuickTime or Video for Windows files, however the quality is not as good. MPEG 2-ISO/IEC 13818 The official title of the ISO/IEC's MPEG-2 specification is, "Generic Coding of Moving Pictures and Associated Audio." It was formally approved in November 1994. MPEG-2 was produced in collaboration with the ITU-T, which also published it as Recommendation H.262. The full title of Recommendation H.262 is "Information Technology-Generic Coding of Moving Pictures and Associated Audio." MPEG-2 is intended to provide compression for studio-quality video applications that include digital broadcast television, digital storage media, digital VCRs and video on demand. MPEG-2 compressed media is suitable for distribution over coaxial and fiber optic cable and satellite. MPEG-1 was forced to compromise on video quality SO that data could play on a single-speed CD-ROM in real time. These compromises manifest as picture blockiness. By contrast, MPEG-2 generates higher quality images when compared to previous video CD players that utilize MPEG-1. MPEG-2 goes beyond MPEG-1 to address the need for higher-resolution images and interlaced video formats. It does SO by compressing a full CCIR-601 digital video image (480 lines by 720 pixels) at a rate of 30 frames per second. It also supports multiple programs in a single stream, interlaced and progressive scan (whereas MPEG-1 supports only progressive), interactive data transmission (for applications such as home shopping and distance learning) and surround-sound audio. MPEG-2 also differs from MPEG-1 in that it can use symmetric compression (MPEG-1 uses asymmetric compression techniques only). MPEG-2 is backward compatible with MPEG-1 and can incorporate MPEG-1 encoded streams. The digital versatile disk (DVD) standard for storing large quantities of digital video and audio specifies MPEG-2 video compress