Duplication detection or Dupe detection as it is commonly known has been a much requested feature in Final Cut Pro for some time, but I have to say Apple have come up with the most useful way to use dupe detection than any other video editor.
Dupe detection is simply a way of checking that you don’t have any duplicates of a clip in your timeline.
It is really important for long form videos, like weddings or full length movies or documentaries because it’s so easy to use the same clip twice.
In the Final Cut Pro version of dupe detection it searches out duplicates of Video clips, Audio clips, Stills, and even Compound clips.