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The white book in IT refers to a handbook released in 1993 covering the video formats of video CDs (VCDs). Video CDs came out in between laser disks and modern DVDs. The white book defines specific formats for video components.
White-book-defined video protocols are compliant with the international standards organization, with audio and video formats rated by MPEG. The white book specifies frame rates and bit rates and other metrics for video CDs. It also defines a CD-I bridge format for a category of “bridge discs” that had to meet certain specifications including those in the green book or “CD-I full functional specification,” which Philips and Sony developed in 1986.