Final Cut Pro X handles render files and other generated media differently than Final Cut Pro 7. Let me explain.
Definition: Generated Media. Media created by Final Cut. This includes render files, optimized media and proxy media.
FINAL CUT PRO 7
FCP 7 did not have the concept of optimized or proxy media. Yes, AVCHD files would be converted using Log and Transfer to ProRes 422, but, in general, you edited what you shot.
When it comes to render files, Final Cut 7 and Final Cut X both create render files for transitions, titles and effects, including color correction. However, once those files are created, the differences begin.
In Final Cut Pro 7, when you deleted or trimmed a clip to which render files were attached, those render files were immediately deleted. The advantage to this was that you never had render files hanging around not being used, but taking up storage.
While this saves a storage space, it also meant that you were often re-rendering clips that had already been rendered.
FINAL CUT PRO X
FCP X allows creating both optimized and proxy media for a wide variety of reasons, but, in general, they boil down to two:
As a fast estimate, assume that one minute of optimized media takes 1 GB to store, while one minute of proxy media takes about 250 MB to store.
However, FCP X significantly differs from from FCP 7 when it comes to render files.
In FCP X, render files are not deleted when you decide to remove a clip from the Timeline, or trim a portion of a clip, that has already been rendered. Instead, Final Cut Pro X hangs on to render files so that if you add that clip back to the timeline, or readjust the trim to a clip, it instantly reattaches the render files, so that no new rendering needs to be done; assuming there were no changes to the clip since the last time it was used.
NOTE: If Final Cut needs to re-render a clip, any existing render files for the frames being re-rendered are deleted.
WHAT TO DO
Apple made it easy for us to manage generated media using File > Delete Generated Library/Event/Project Files. Final Cut determines which menu to display based upon what you have selected before going to the File menu.
In all three cases, this dialog appears.
If you realize, too late, that you should not have deleted either the optimized or proxy files, re-create them by selecting the clips you want to use in the Browser and choose File > Transcode Media. Again, all you lose is time.
Give the amount of storage media often required, deleting generated files sounds like a good idea. In general, though, I don’t worry about this, unless I’m desperately short on storage space.
However, I DO delete generated media when archiving a project. There’s no reason to archive files that Final Cut can easily recreate when it needs them in the future.
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