Apple Final Cut Pro 5 - Manual (Page 1320)

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Rendering
When you apply more effects to a clip than your computer
can process in real time, you need to render temporary
media files to watch your sequence in real time.
This chapter covers the following:
 What Is Rendering? (p. 533)
 Render Indicators in Final Cut Pro (p. 535)
 The Rendering Process (p. 539)
 Changing Render Settings (p. 549)
 Managing Your Render Files (p. 559)
 Tips for Avoiding Unnecessary Rendering (p. 563)
What Is Rendering?
Rendering is the process of creating temporary video and audio render files for portions
of your sequence that Final Cut Pro cannot play in real time. When you render a portion
of your sequence, Final Cut Pro substitutes those portions with the render files, as
indicated by render status bars above the ruler in the Timeline. If you change the
parameters of your effects, you need to rerender.
Since rendering takes time away from the editing process, the goal is to render as little
as possible. For more information about real-time playback, see Chapter 23, “
Using RT
Extreme ,” on page 509.