Apple Final Cut Express HD - Manual (Page 894)

894 Part X Real Time and Rendering
Using Nested Sequences to Preserve Render Files
You can preserve render files for a sequence or for audio clips within a sequence by
nesting that sequence within another sequence. Nesting is particularly useful for
protecting the render files for effects-intensive clips you plan to trim frequently.
If a change is made to a parent sequence that’s been nested, it needs to be rerendered
before the nested sequence plays in real time. Modifications include any compositing,
speed changes, or changes in filters, transitions, or other effects.
For detailed information, see “ Sequence to Sequence Editing ” on page 539.
Disabling Tracks Affects Render Files
When you disable a video or audio track in the Timeline, any render files associated
with that track are lost. If this happens, you can restore that track’s render files by using
the Undo command.
Tips for Avoiding Unnecessary Rendering
You can do several things to avoid rendering.
 Edit the majority of your project using cuts only; only add transitions, effects, or
filters that can play back in real time or that are absolutely necessary in making
decisions about your first cut. Avoiding unnecessary effects and time-consuming
rendering can help you focus on your program’s overall pacing and structure. Once
your first cut is done, you can focus on applying effects like color correction and titles
without being distracted.
 Use the Unlimited RT mode and dynamic real-time playback. For more information,
see Chapter 59, “ Using RT Extreme ,” on page 865.
 If you use effects that need to be rendered, you can get a good idea of how the clip
looks by simply scrubbing through the clip in the Timeline or Canvas to view the
effect one frame at a time.
You can also choose Mark > Play > Every Frame (or press Option-\) to play through a
clip one frame at a time, not in real time, and get a slow-motion preview of how the
effect will look.
 When you change the In and Out points of a clip with filters applied, you may need
to rerender the adjusted areas. To avoid constantly rerendering, you can place a clip
with its applied filters into a sequence, and then edit that sequence into other
sequences. This is sometimes called nesting a sequence. Because you modify the
sequence In and Out points instead of the clip within the sequence, the render file
for the clip is maintained. For detailed information about nesting clips using the Nest
Items command, see “
Sequence to Sequence Editing ” on page 539.
 Disable filters that require rendering when you don’t need to view the effects in
order to make decisions.