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CHP. 16 PREVIEWING AND ANALYZING VIDEO
291
Note:
Each prerendered section will consist of no more than
10 seconds (approximately 40 megabytes). Because selective
prerendering creates multiple files, minor editing on the
timeline will not invalidate all of your prerendered video—
only the sections you modify will need to be rerendered.
Building dynamic RAM previews
Video frames are automatically dropped when previewing if the computer can’t keep up with processing
demands. This means that you may not be seeing all video frames as you preview your project. If you prefer
not to prerender your project, there is another option for improving previews of selected portions of a
project. A portion of your RAM is dedicated to cache video frames that Vegas software cannot render in real
time.
A cache of 16 MB is automatically maintained for dynamic RAM previews. To change the cache amount,
choose
Preferences from the Options menu and change the Dynamic RAM Preview Max value on the Video tab.
Note:
Although not all frames appear in previews of a
project, all frames are included when you render a file. For
more information, see Rendering a project on page 307.
You can make a time selection and add each frame in the selection to the cache. Once the frames are
cached, all video frames can display in a selection.
1.
Select a region containing the frames you want to cache.
2.
From the Tools menu, choose Build Dynamic RAM Preview.
Vegas software plays through the time selection and builds the cache frame by frame.