HP ProLiant 3000 Video Streaming Technology - Page 12

ECG068/0798 WHITE PAPER (cont.) MPEG-4 Audio/Visual Scene 1...2 standard for DVD-ROM which, at 7x the capacity of the CD, is ultimately expected to replace CD-ROM and VHS tapes for long-play quality video. DVD-ROM can hold at least 130 minutes of MPEG-2 video with Dolby AC-3 surround-sound stereo audio. (DVD-ROM supports Dolby AC-3 audio rather than the MPEG-2 audio). Another significant difference between MPEG-2 and MPEG-1 is the support of "Transport Streams" in MPEG-2. The concept of Transport Streams is designed for the delivery of video through error-prone networks. These streams consist of smaller fixed-length 188-byte data packets for error control and can also contain multiple video programs that are not necessarily time related. This makes MPEG-2 more suitable for the delivery of video over error-prone networks such as coax cable TV, ATM, and satellite transponders. MPEG-4 MPEG-4 is a new MPEG standard that was originally proposed in 1993 for low-bit-rate applications such as the Internet or PSTN for such applications as video-conferencing, Internet video phones, video terminals, video email, wireless mobile video devices, and interactive home shopping. It was originally designed to support data rates of 64Kbps or less, but recently has been enhanced to support a wide range of bit rates from 8 Kbps to 35 Mbps. This enables it to support both consumer and professional video with a variety of resolutions corresponding to the H.263 video conferencing standard discussed earlier. Its main difference is the ability to transmit objects described by shape, texture, and motion, instead of just the transmission of rectangular frames of pixels. This enables interaction with multimedia objects as opposed to the frame-based interaction of MPEG-1 and MPEG-2. Voice Video Object AV Presentation 2D Background This object-based streaming approach has application in configurable TV, interactive DVD, interactive web pages, and animations. Video-Streaming Until fairly recently, video has been delivered by the "download and play" method. In this approach, the entire video file is downloaded over a network to the client and stored on a hard drive. When it is all there, the user can play it from the hard drive. The advantage of this approach is that reasonably high quality video can be delivered, even over a low bandwidth