Autodesk 64006-051108-9001 User Guide - Page 283

275 Windows Media Video - Windows Media Technologies' latest video codec. Windows Media Technologies - Microsoft's streaming media architecture. World Wide Web - hyperlinked, graphical application of the Internet. WVX - Windows Media metafile that is placed on an HTTP server and gives Windows Media the location of the Windows Media Video file on the Windows Media Server. Video Buffer Verifier - used to emulate the data buffer size on an MPEG player so the stream plays smoothly. xDSL - refers collectively to all types of Digital Subscriber Lines. See ADSL. XML - short for Extensible Markup Language, used to create settings and Eventstream information in an open, cross-platform manner. XML files can be opened and edited using an XML editor or a standard text editor. Y'CbCr - color model that describes color information in terms of luminance (Y) and two chrominance channels (Cb,Cr). The Y'CbCr space is commonly used in digital video and easily supports color subsampling. YUV is often used mistakenly to describe this color space, but YUV is accurate only for broadcast. YUV - see Y'CbCr. YUV9 - color format with substantial subsampling often used with online video technologies, such as Sorenson Video. For every 16 luminance "Y" samples in a 4x4 pixel block, there is only one "U" and one "V" sample. This dramatic color subsampling produces smaller files with correspondingly lower color fidelity. YUV9 subsampling often results in noticeable color artifacts around the edges of brightly colored objects, especially red.