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Chapter 9. Previewing Transitions and Effects

Chapter 9. Previewing Transitions and Effects

As you know, playing back your edited program is easy: just hit the program view's play button and enjoy. This works great as long as your program consists of simple cuts. But you may have noticed that transitions and other effects don't play back so readily. Instead, the program view displays an X in the corner of the image, ignoring transitions, filters, motion settings, or superimposed clips (Figure 9.1).

Figure 9.1. The program view displays an X in the corner of the image if the effect has not been previewed.


In a cuts-only sequence, the source video and audio undergoes relatively little processing; it's pretty much ready to play. Transitions and other effects, on the other hand, must be generated, or rendered, by processing the footage. In the Timeline window, a red line above the time ruler indicates the areas that require processing (Figure 9.2). Rendering these portions of the program for playback is known as previewing.

Figure 9.2. In the Timeline window, a red line above the time ruler indicates the areas that require processing.


The necessity of rendering effects has always been considered the Achilles'heel of non- linear editing systems. Though various NLEs share similar features, processing speed has always distinguished the higher-end, higher-priced systems. As you learned in Chapter 1, hardware components can accelerate the rendering process, allowing you to preview certain effects right away, in "real time." Matrox and Pinnacle offer Premiere systems with real-time effects.

Even without hardware acceleration, however, rendering times shouldn't unduly hinder most types of work. Technical developments—like ever-increasing proc essing power and the DV format—make processing even high-quality video much faster than in the past.

In this relatively short chapter, you'll learn the different preview methods, as well as how to manage files related to them.


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