Adobe 12040118 - After Effects Standard Tutorial page 530

Media cache
When After Effects imports video and audio in some formats, it processes and caches versions of these items that it can readily access when
generating previews. Imported audio files are each conformed to a new .cfa file, and MPEG files are indexed to a new .mpgindex file. The media
cache greatly improves performance for previews, because the video and audio items are not reprocessed for each preview.
Note: When you first import a file, you may experience a delay while the media is being processed and cached.
A database retains links to each of the cached media files. This media cache database is shared with Adobe Media Encoder, Premiere Pro,
Encore, Soundbooth, so each of these applications can each read from and write to the same set of cached media files (Note: Adobe Audition
CS5.5 does not share the media cache database). If you change the location of the database from within any of these applications, the location is
updated for the other applications, too. Each application can use its own cache folder, but the same database keeps track of them all.
Choose Edit > Preferences > Media & Disk Cache (Windows) or After Effects > Preferences > Media & Disk Cache (Mac OS), and do one of
the following:
Click one of the Choose Folder buttons to change the location of the media cache database or the media cache itself.
Click Clean Database & Cache to remove conformed and indexed files from the cache and to remove their entries from the database.
This command only removes files associated with footage items for which the source file is no longer available.
Note: Before clicking the Clean Database & Cache button, make sure that any storage devices that contain your currently used source
media are connected to your computer. If footage is determined to be missing because the storage device on which it is located is not
connected, the associated files in the media cache will be removed. This removal results in the need to reconform or re-index the footage
when you attempt to use the footage later.
Cleaning the database and cache with the Clean Database & Cache button does not remove files that are associated with footage items for
which the source files are still available. To manually remove conformed files and index files, navigate to the media cache folder and delete the
files. The location of the media cache folder is shown in the Conformed Media Cache preferences. If the path is truncated, click the Choose
Folder button to show the path.
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