MANHASSET, N.Y. STMicroelectronics has announced details of a portfolio of technologies the company is developing for audio/video streaming in wireless home IP-based networks.
The technologies include video transcoding, advanced video encoders and robust decoders (H.264), Adaptive Playout, 802.11n WLAN, and Security/DRM (Digital Rights Management). STMicroelectronics (Geneva, Switzerland) expects these technologies to allow seamless sharing of multimedia content within different devices (set-top boxes, PCs, DVD players/recorders, mobile terminals) connected through wireless links.
For video transcoding, ST's Advanced Systems Technology (AST) group is developing a technology called Dynamic Bitstream Shaper (DBS). This is a global MPEG-2/ H.264 input/output framework that will support changes in bitrate, frame rate, frame size and coding standard without needing to decode and re- encode the bitstream.
ST has developed and tested high performance algorithms for MPEG-2 to MPEG-2 bitstream and MPEG-2 to H.264 bitstream transcoding, both with bit-rate, frame rate and resolution change supported. ST is also extending transcoding to support VC-1. Its DBS technology will deliver reduced computational workload and power consumption, reduced delays and increased quality compared to existing decoding/re- encoding methods.
Error detection and concealment algorithms have also been developed for H.264 decoding, allowing the decoder to sustain and conceal data packet losses, a common condition on wireless packed-based best effort IP networks. Adaptive playout techniques have also been developed that minimize buffering delays during interactive multimedia services such as videoconferencing or channel changing.
To improve service quality, ST's Cross-Layer Controller algorithm allows joint optimization of transmission parameters such as WLAN configuration and video stream bit rate, frame rate and resolution.