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Work with preview filesWhen
you render previews, Adobe Premiere
Pro creates
files on your hard disk. These preview files contain the results
of any effects that Adobe Premiere
Pro processed
during a preview. If you preview the same work area more than once without
making any changes, Adobe Premiere
Pro instantly
plays back the preview files instead of processing the sequence
again. Adobe Premiere
Pro stores the preview files
in a folder you can specify. Similarly, preview files can save time when
you export the final video program by using the processed effects
already stored.
Note: Adobe Media Encoder does
not automatically use Adobe Premiere
Pro preview files
for encoding. To make use of the Adobe Premiere
Pro preview
files, you must select this option in Adobe Media Encoder for each
encoding process. Also, Adobe Media Encoder uses
the Adobe Premiere
Pro preview files during export
only if the export settings match the preview file settings exactly.
If there is any mismatch, Adobe Media Encoder
uses the original source files.
To further save time, Adobe Premiere Pro maintains existing preview files whenever possible. Preview files move along with their associated segment of a sequence as you edit your project. When a segment of a sequence is changed, Adobe Premiere Pro automatically trims the corresponding preview file, saving the remaining unchanged segment.  When completely done with a project,
delete preview files to save disk space.
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