When you are working on a video project on your Mac with Apple's Final Cut Pro application, you can insert a black clip between clips. The film industry refers to a black clip as a "slug," and Apple refers to a black clip as a "gap clip" or a "placeholder" clip. You can insert a black clip as a transition between scenes to create an emotional effect, for example, or you can use a black clip as a placeholder until you actually add the desired footage later.
Launch Final Cut Pro on your Mac and open the project in which you want to create a slug.
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Drag the playhead to the point in the timeline where you want to add a slug.
Click "Edit" from the Final Cut menu and then click "Insert Gap" to insert a black gap clip at the point you selected.
Click "Edit" from the Final Cut menu and then click "Insert Placeholder" to insert a clip of black footage, such as to use as a transition between scenes. The default placeholder clip has outlines of human forms, whose number you change by clicking the "People" drop-down menu in the Placeholder panel. Click the "People" drop-down menu and then click "0" to remove the human forms. Click the "Background" drop-down menu and then click "Black" to make the placeholder clip solid black.
Drag the right edge of the gap clip or the placeholder clip to the right to lengthen it, and drag it to the left to decrease its duration.