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Chapter 9. QuickTime > The QuickTime Media Layer

The QuickTime Media Layer

One of the concepts introduced in QuickTime 2.0—and greatly expanded in QuickTime 3.0—is the QuickTime Media Layer (QTML). Essentially, QTML is the QuickTime architecture that allows many layers of media to be contained in the same QuickTime file. These layers of media include QuickTime VR, QuickTime movies, 3D MetaFile (3DMF) objects, sprites, audio, MIDI, and text, as well as a variety of programming hooks. The big catch with QTML is the fact that most authoring tools have yet to truly exploit this capability.

Although Live Picture's Reality Studio, for example, allows you to easily create panoramas that combine VR scenes, movies, audio, VR objects, and other data by using proprietary technology, only a few QuickTime tools allow you to incorporate more than two or three of the supported data types. Macromedia's QuickTime 3.0 Xtra and a utility called Nodemedia (see Figure 9.1) are both designed to provide this functionality, but these tools were still in the works when I wrote this chapter. Other tools, such as Lari Software's Electrifier Pro, allow you to create animations in QuickTime's new vector graphics format, while Terran Interactive's Media Cleaner Pro provides special support for QuickTime 3's streaming formats and other Web features.


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