Download PDF by Cliff Wootton: A Practical Guide to Video and Audio Compression: From

By Cliff Wootton

ISBN-10: 0240806301

ISBN-13: 9780240806303

Research all approximately Codecs--how they paintings, in addition to layout and implementation with this entire, easy-to-use advisor to compression. After interpreting this booklet, it is possible for you to to organize and distribute specialist audio and video on any platform together with streamed to the internet, broadcast on-air, kept in PVRs, Burned onto CD-ROMs or DVDs, added via broadband, or considered in Kiosk purposes, PDA units, and cellphones.

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Extra resources for A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks

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More high-definition services will be launched during the next few years. Plasma, LCD, or LED flat screens are available in sizes up to 60 inches diagonal. If you want to go larger than that, you will need to consider a projection system. At large screen sizes, it helps to increase the resolution of the image that is being projected, and that may require some special hardware to scale it up and interpolate the additional pixels. At these increased screen sizes, any artifacts that result from the compression will be very obvious.

Trying to deploy it in unsuitable circumstances leads to difficulty later in the production and consumption cycle. 1 Origination Stage Video compression should be avoided at the origination stage. Some cameras compress the video as it is written to tape or disk inside the camera. These devices never yield an uncompressed output. The consequence is that any content you shoot with such a camera will probably turn out to be totally useless for anything other than home movies. For example, suppose you are shooting some training video and you want to color key the background.

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.

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A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks by Cliff Wootton


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