Billy, John that EETimes article is posted now...
complete with DVx diagram.
techweb.cmp.com
MPEG codec allows non-linear editing
By Junko Yoshida
LAS VEGAS - C-Cube Microsystems has introduced to the nation's broadcasters a single-chip MPEG-2 encoder/decoder IC that performs non-linear editing.
The move, announced Monday at the National Association of Broadcasters convention, is a pioneering attempt by a chip vendor to do frame-accurate editing on encoded MPEG streams. Virtually all non-linear editing today is done on JPEG-based equipment.
C-Cube's single-chip MPEG-2 codec can simultaneously decode two streams while providing both frame-accurate editing and blending of the streams, the company said. It can also add such special effects as fades, wipes and dissolves to decoded digital video streams on the fly.
"We are driving an industry's shift to an MPEG-based, networked digital-video environment," said Clint Chao, senior marketing director of the PC/codec division at C-Cube (Milpitas, Calif.).
For years, the industry's conventional wisdom has held that full I (intra-), P (predictive-), B (bidirectional-) frame-based MPEG streams cannot be edited without first being decoded.
On the server market, however, Hewlett-Packard Co. has developed its MediaStream Broadcast server with full-featured MPEG capabilities including jog-and-shuttle features, and "clean-cut, frame-accurate" editing based on full I,P,B frames.
[I missed this the first time I read it]
HP's patented "CleanCut" editing uses two MPEG-2 decoders, doing the frame-accurate editing on the fly by controlling and switching between two decoded streams in the uncompressed video domain.
"There is really no other way around it to do frame-accurate editing on MPEG," said Al Kovalick, strategist for technology and standards at HP. "We have a bulletproof patent on this."
[Is this a veiled threat?]
HP's MediaStream Broadcast servers use IBM Microelectronics-developed MPEG-2 encode/decode chips.
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