Issue link: https://www.e-digitaleditions.com/i/1156106
October/November/December 2019 I 13 STREAMING VIDEO—AV CONTENT DELIVERED OVER ETHERNET NETWORKS AV content can be streamed over Ethernet LANs and WANs, as well as the internet. This allows real- time delivery of AV content, such as presentation materials, videoconferencing, lectures, music, movies, concerts, and sporting events. Often, this material can be recorded and stored for later viewing on demand. The Role of Video Compression in Ethernet Transmission The data rate of uncompressed digital video is too high for delivery over Ethernet networks. Therefore, video compression is employed. Video codecs—encoders/ decoders—compress and decompress the video bit stream using various algorithms. The H.264/AAC codec is in widespread use today. Just as it replaced its predecessors, H.264/AAC will give way to more efficient codecs with fewer design tradeoffs as 1080p HD video is overtaken by 4K UHD and beyond. The design tradeoffs that all codecs seek to minimize involve a careful balance between image quality, bit rate, and processing latency based on appli- cation requirements. Streaming movies in 4K to large displays requires the best image quality possible. In order to achieve this higher quality, bit rate and latency are sacrificed through use of more network bandwidth and more complex processing. On an interactive link for con- ferencing, low latency is paramount, so image quality and bit rate are sacrificed. All codecs, including H.264/AAC, rely on the following compression techniques to some extent to achieve the tradeoffs described: • Chrominance Subsampling—Chrominance represents how much data in a pixel is allocated to color. In chrominance subsampling, the video signal is separated into a brightness channel and two-color channels. The color channels are sampled at a lower rate than the brightness. Color infor- mation is decreased, but eyes are less sensitive to color than to brightness, making the impact barely noticeable. The data rate of uncompressed digital video is too high for delivery over Ethernet networks. Therefore, video compression is employed. BICSI EVENTS ARE HAPPENING ALL AROUND THE WORLD IN 2019 3rd Annual ACE Summit, Dubai, UAE....................................................................................................... 8 October EMEA Saudi Arabia Tech Roadshow, Jeddah, Riyadh, Al Khobar, Saudi Arabia ... 13, 15, 17 October EMEA Italy Conference & Exhibition, Rome, Italy ............................................................................ 30 October CALA Puerto Rico Conference & Exhibition, San Juan, Puerto Rico .................................... 7 November BICSI Day Greece, Athens, Greece ...........................................................................................................15 November BICSI Day Korea, Seoul, Korea ..................................................................................................................15 November BICSI Day Ecuador, Quito, Ecuador ........................................................................................................21 November Japan Conference & Exhibition, Tokyo, Japan ................................................................................21 November Southeast Asia Conference & Exhibition, Manila, Philippines ...................................... 25-26 November South Pacific Australia Conference & Exhibition, Melbourne, Australia ................. 26-28 November EMEA Tech Breakfast, Dubai, UAE ..........................................................................................................5 December Speaking and sponsorship slots are available. Email global@bicsi.org or call Amy Slowik, Global Events Supervisor, at +1 813.769.1844 for information. Visit bicsi.org/conferences for details and the most up-to-date schedule.