A practical guide to video and audio compression: from by Cliff Wootton

By Cliff Wootton

Research all approximately formats - how they paintings, in addition to layout and implementation with this accomplished, easy-to-use consultant to compression. After analyzing this ebook, it is possible for you to to arrange and distribute expert audio and video on any platform together with streamed to the net, broadcast on-air, saved in PVRs, Burned onto CD-ROMs or DVDs, introduced through broadband, or seen in Kiosk purposes, PDA units, and cellular phones.Key benefits:* research from an award-winning technologist for a most sensible media corporation who is aware the best way to clarify formats in phrases you could comprehend* This entry-level advisor includes transparent causes and 1000's of diagrams - no math historical past wanted! additionally incorporates a finished word list which serves as an invaluable connection with many technical phrases and jargon you are going to come upon* methods to select the suitable strategy to get the main from your compression process - saving either space for storing and cash

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2 Online Interactive Multi-Player Games Multi-player online gaming systems have become very popular in recent years. The realism of the visuals increases all the time. So, too, does the requirement to hurl an evergrowing quantity of bits down a very narrow pipe. The difficulty increases as the games become more popular, with more streams having to be delivered simultaneously. Online games differ significantly from normal video, because for a game to be compelling, some aspects of what you see must be computed as a consequence of your actions.

The next level of spatial compression in terms of complexity is the JPEG technique, which breaks the image into macroblocks and applies the discrete cosine transform (DCT ). This kind of compression starts to become lossy. Minimal losses are undetectable by the human eye, but as the compression ratio increases, the image visibly degrades. Compression using the JPEG technique reduces the data to about 10% of the original size. Origin 0,0 x,y Extent Figure 2-1 Uncompressed image pixel map. 18 A Practical Guide to Video and Audio Compression 0,0 100,100 Figure 2-2 Run-length encoding.

Broadcast news coverage is being originated on videophones, mini-cams, and videoenabled mobile-phone devices. The quality of these cameras is rapidly improving. To maintain a comfortable size and weight for portable use, the storage capacity in terms of hardware has very strict limits. Video compression increases the capacity and thus the recording time available by condensing the data before recording takes place. Current practice is to shoot on a small DV camera, edit the footage on a laptop, and then send it back to base via a videophone or satellite transceiver.

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