By Cliff Wootton
Research all approximately Codecs--how they paintings, in addition to layout and implementation with this finished, easy-to-use advisor to compression. After examining this publication, 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, introduced by way of broadband, or seen in Kiosk functions, PDA units, and cellphones.
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Additional resources for A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks
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. Spatial compression is used to define a starting point or key frame. After that, only the differences are described. Reasonably good quality is achieved at a data rate of one tenth of the original data size of the original uncompressed format. Research efforts are underway to investigate ever more complex ways to encode the video without requiring the decoder to work much harder.
This is all done more effectively on desktop machines with greater processing power. The laptop solution is part of an end-to-end process of workflow that allows a lot of work to be done in the field before content is shipped back to base. 30 A Practical Guide to Video and Audio Compression Figure 2-9 Portable laptop and video camera. 2 Video Playback on Handheld Devices Handheld video playback is becoming quite commonplace. There are several classes of device available depending on what you need.
Some of your pre-compression processing, such as cropping and scaling, is going to be based on what you know about these values. The frames per second (fps) value tells you whether any time-based correction or pulldown is necessary to introduce additional frames for your target output platform. The scanning method indicates the complexity of any motion-based processing. Raw film can be converted to interlaced or progressive scanning quite easily. Video originates in an interlaced format, and that does not conveniently convert to progressive scanning without some complex interpolation.