A Practical Guide to Video and Audio Compression: From Sprockets and Rasters to Macro Blocks
Cliff Wootton
Language: English
Pages: 800
ISBN: 0240806301
Format: PDF / Kindle (mobi) / ePub
Learn all about Codecs--how they work, as well as design and implementation with this comprehensive, easy-to-use guide to compression. After reading this book, you will be able to prepare and distribute professional audio and video on any platform including streamed to the web, broadcast on-air, stored in PVRs, Burned onto CD-ROMs or DVDs, delivered by broadband, or viewed in Kiosk applications, PDA devices, and mobile phones.
to Gina Marzilli, who guided us down the right path on the administrative side. The manuscript was skillfully progressed through the production process by Becky Golden-Harrell—thanks, Becky. Let’s do it again. Copyediting was ably managed by Cara Salvatore, Sheryl Avruch, and their team of experts. Thanks guys; you really turned this into a silk purse for me. Of course, without the products in the marketplace, we’d have very little success with our endeavors. I’d like to send warm thanks to the
scaling in X and Y. Figure 5-18 shows how these formats are fitted onto a TV screen. 2.35:1 on 4:3 with letterbox cutout 2.35:1 on 16:9 with letterbox cutout Figure 5-18 Panavision aspect ratio. 96 A Practical Guide to Video and Audio Compression With the plethora of aspect ratios and built-in zoom and stretch modes on modern TV sets, it is very likely that almost no TV services and movies are broadcast in the aspect ratio that the program maker or movie director intended. But the human
output. Digital camera functionality is important since that may be how you originate some content. At the end of the chapter we look forward to some interesting work being done to increase the dynamic range of the imaging model. This is likely to have a profound effect on the image quality we are able to source. 115 116 A Practical Guide to Video and Audio Compression 6.3 Computer Video Display Standards In recent times, a variety of popular image sizes have become de-facto standards. These
around similar algorithmic approaches because the engineers all go to the same conferences and read the same technical papers. The differences are in the fine points of the implementations and the choices the engineers make when constructing them. Choosing the Right Codec 173 The current state of the art for players is to deliver architectures that allow different codecs to be plugged in at run time. The players are separated somewhat from the codecs. This is how it’s done: A player provides
formats it can play. The only downside used to be that there was no Windows Media or Real Networks plug-in codec for QuickTime. Now that Telestream has dealt with the lack of a Windows Media plug-in and Real Networks has released its own plug-in, we have a unifying option that facilitates some powerful workflow solutions. For encoding, you have to choose either hardware or software. For professional, high throughput, the best solution is hardware at whatever cost; and for the semi-pro, software