To: Stoctrash who wrote (31528 ) 3/28/1998 1:15:00 PM From: John Rieman Respond to of 50808
MPEG-2 editing.................................. Besides NBC and prime contractor Sarnoff, the participating companies are Comark Communications Inc. (Southwick, Mass.); IBM Corp. (Yorktown Heights, N.Y.); Philips Laboratories (Briarcliff Manor, N.Y.); MCI (Richardson, Texas); Sun Microsystems Inc. (Mountain View, Calif.) and Thomson Consumer Electronics Inc. (Washington). Their work has spanned a range of technologies, including enhancements to asynchronous-transfer-mode networks and methods for editing a compressed MPEG-2 data stream. Sarnoff's Isnardi sees two parts to a successful digital HDTV rollout: content availability and affordable receivers. "We are addressing the first issue through our joint venture," he said. The goal is to achieve efficient HDTV-content production by providing low-cost, accessible enabling technologies that offer sufficient flexibility without straying too far from familiar production methods. The researchers have devised ways to splice and add effects to digital streams in the compressed domain; network old and new studio devices together, regardless of the physical distances that separate them; manage studio resources and content in a networked studio; locate a desired video clip amid the data stored in various servers; and play the clip on demand. Despite the industrywide push to go digital, broadcasters see little advantage to doing so today. No commercial technologies exist to enable such basic editing functions as real-time cuts, switch, cross-fades, wipes or on-screen logo titling onto the MPEG-2 video streams in the compressed domain. The current, ungainly solution is to decode everything into an uncompressed domain first, for processing, and then re-encode the whole stream back into MPEG-2. That approach, often requiring more than several generations of compression, degrades picture quality and jacks up studios' costs. Being forced to store and route uncompressed video streams compounds the cost burden, said Terry Smith, director of advanced television systems at Sarnoff.techweb.com