Apple M8728Z/A User Manual - Page 142
Deleting a Source Clip File, Deleting a Database Record
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The Difference Between Self-Contained and Reference Media Files There are two basic video and audio file types that you need to be aware of, especially if you are breaking a large media file into smaller ones using QuickTime Pro. Because video files tend to be large, the type of media file you create can have a large impact on your hard disk space. • Self-contained media files: A self-contained media file is complete; you can delete the original file and its duplicate will still play on its own. For that reason, self-contained media files are typically large files. It's a good idea to save your media as self-contained if you intend not to use large portions of the original, and then you can delete the original once you have saved the bits you want. • Reference media files: A reference media file is a file with dependencies on the original media file. Reference files do not contain any actual media content-they contain only pointers to a specific part of the original media file. The files for these clips are small. If you delete, move, or rename the original media file, any files that refer to it will no longer play, because they cannot locate the original. One way to tell if a media file is self-contained or reference is to open it in the Cinema Tools Clip window and click the Analysis button. The Analysis pane displays this information. Another way to tell is to look at its file size-media files with dependencies have small (20 kilobyte or so) file sizes, whereas self-contained media files, even short ones, can have file sizes up to hundreds of megabytes or more. Deleting a Source Clip File To eliminate an unwanted source clip file before you start editing, drag the clip to the Trash. Then, if there is a record for that clip in the Cinema Tools database, delete that database record. Refer to Deleting a Database Record for more information. 142 Chapter 8 Preparing the Source Clips for Editing