Apple Final Cut Pro 7 - Manual (Page 1825)

When the handle size setting is set to ten frames, five additional frames on either side
of the duplicate frames are displayed.
Five additional frames
beyond the duplicate
frames are shown here...
...and here.
Ten duplicate frames
• Threshold: This allows you to set a minimum number of frames that must be duplicated
before a duplicate frames indicator appears. By default, this is set to 0 so that all
instances of duplicated frames are indicated. You can set it as high as 99 frames (3 to
4 seconds, depending on the frame rate), in which case there would have to be a
minimum of 99 consecutive duplicated frames before a duplicate frames indicator
would appear. For more information on duplicate frames indicators, see
“Keep Track
of Duplicate Frames” and “Adding Transitions.”
1825 Chapter 111 Choosing Settings and Preferences