The "Consolidate" command (under the File menu) searches your hard drive using Spotlight to find videos that either should be added to Clipstart's video library, or that are already in the library and can be deleted from the duplicate location. Depending on the size of your library this command may take some time to run.
When it finishes, you will have two views into the list of files Clipstart has found:
• "Orphaned videos not yet added to the library" — this shows files you may want to add to Clipstart.
• "Duplicate videos in the library" — this shows files outside the library that look like duplicate copies.
Switching between the choice at the top of the results window will change the files displayed. For duplicates, both the video in your library and the duplicate will be shown alternatingly.
The default button (either "Add to Library" or "Move to Trash") will only act on videos that have been checked. By default this includes all results. You should scan the list and uncheck any videos that you do not want to run the action on.
As always when performing major maintenance on your video library, please make sure you have backups first.