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

By Cliff Wootton

Study all approximately Codecs--how they paintings, in addition to layout and implementation with this accomplished, easy-to-use advisor to compression. After interpreting this publication, it is possible for you to to arrange and distribute specialist audio and video on any platform together with streamed to the internet, broadcast on-air, saved in PVRs, Burned onto CD-ROMs or DVDs, brought by means of broadband, or considered in Kiosk functions, PDA units, and cell phones.

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Additional info for A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks

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Cheap and effective ways to provide that content to end users are needed, too. Video compres- Why Video Compression Is Needed 19 Figure 2-3 Removing frames for temporal compression. sion can be used at the point where video is imported into your workflow at the beginning of the content chain as well as at the delivery end. If you are using video compression at the input, you must be very careful not to introduce undesirable artifacts. For archival and transcoding reasons, you should store only uncompressed source video if you can afford sufficient storage capacity.

The solution is to get a better camera and shoot the footage at the best-quality camera settings available, and then write it to tape with a high-bit-rate storage format with a nearlossless compression method. 2 Not for Archiving Master-Quality Material For much the same reasons that you would a) shoot footage using the best available quality of equipment, film stock, or video recording format and b) use lossless compression techniques (the intent is to preserve the maximum information), the archives must be maintained at the highest possible quality.

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. Higher bit rates will be necessary to allow a lower compression ratio.

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