By Cliff Wootton
Study all approximately Codecs--how they paintings, in addition to layout and implementation with this finished, easy-to-use consultant to compression. After analyzing this e-book, it is possible for you to to arrange and distribute specialist audio and video on any platform together with streamed to the net, broadcast on-air, kept in PVRs, Burned onto CD-ROMs or DVDs, added by means of broadband, or considered in Kiosk purposes, PDA units, and cellphones.
Read or Download A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks PDF
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Additional info for A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks
18 A Practical Guide to Video and Audio Compression 0,0 100,100 Figure 2-2 Run-length encoding. 6 Temporal Compression Video presentation is concerned with time and the presentation of the images at regular intervals. The time axis gives us extra opportunities to save space by looking for redundancy across multiple images. This kind of compression is always lossy. It is founded on the concept of looking for differences between successive images and describing those differences, without having to repeat the description of any part of the image that is unchanged.
3 How Film Projectors Work Projectors and cameras transport the film in the same way. The camera simply uses a slightly larger shutter aperture than the projector. Many alternative mechanisms were 43 44 A Practical Guide to Video and Audio Compression tried and discarded before the sprocket-driven serial frame design became dominant. A visit to the National Museum of Film and Television in Bradford, UK or the Science Museum in London will reward you with some insights into the way that film technology has evolved.
1 Mobile Journalism News-gathering operations used to involve a team of people going out into the field to operate bulky and very expensive equipment. As technology has progressed, cameras have gotten smaller and easier to use. A film crew used to typically include a sound engineer, cameraperson, and producer, as well as the journalist being filmed. These days, the camera is very likely carried by the journalist and is set up to operate automatically. Broadcast news coverage is being originated on videophones, mini-cams, and videoenabled mobile-phone devices.