Chapter 20 . Playing Music and Video 509 (Ftp web hosting)
Thursday, May 3rd, 2007Chapter 20 . Playing Music and Video 509 the time. Some of the key technologies that reflect improvements in how audio and video codecs have improved include: . Ogg Vorbis This audio codec has been developed as a freely available tool no patents or licensing needed. Ogg is the data container portion of the codec, and Vorbis is the audio compression scheme. There are other compression schemes that can be used with Ogg such as Ogg FLAC, which is used for archiving audio in a lossless format, and Ogg Speex, which is used to specifically handle encoding speech. . Real Networks Real has developed a set of audio and video codecs that have amazing ability to serve up streaming content. This protocol is not widely supported by anyone but Real. The Helix project produces a player for Linux that enables playback of Real media encoded files. . WMA Windows Media Audio is used to create high-quality digital audio. WMA is considered a lossless codec, which means the audio doesn t lose quality or data as a result of repeated compression-decompression cycles. Among its other benefits is that it s one of the first widely used codecs to support digital surround sound. . WMV Windows Media Video is used, not surprisingly, to encode and decode video. This is also a very high-quality encoder and is billed to produce a video that is half the size of an MPEG-4 encoded video at a comparable quality level. . DivX This video codec has revolutionized digital video. Extremely highquality video can be stored with amazingly small file sizes when using this codec. DivX (Digital Video Express) is based on the MPEG-4 video standard and can produce 640 480 video about 15 percent of the size of the source DVD material. Some of these codecs are integral parts of Digital Rights Management (DRM) scenarios. For example, WMA, WMV, and DivX have elements that support DRM. DRM is basically proprietary copy protection. The term DRM applies to a wide range of technologies that use server-based activation, encryption, and other elements to control who can access content and what they can then do with the content once it has been accessed. While it is very attractive to distributors of audio and video, who are trying to prevent unchecked digital piracy of their content, it can be a real stumbling block for the consumer. Many DRM solutions require proprietary software and even hardware to work with the protected content. A prime example is the recent production of some DRM-protected audio CDs, particularly in Europe. Some of these disks will not play in older standalone CD players, some will play only on a computer that supports the DRM application on the CD itself, and (especially frustrating) some will not play on a computer at all.
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