A subframe has 1/80 the duration of a video frame and is thus a more precise unit of reference when editing audio at the sample level.

You can view subframes in the timecode display of the Dashboard. In the General pane of the Final Cut Pro Preferences window, click the Time Display pop-up menu and choose the subframe option (HH:MM:SS:FF + Subframes).

compound clip

compound clip in Final Cut Pro X

You can use compound clips to group any combination of clips in the timeline or the browser, and nest clips within other clips.

Compound clips can contain video and audio clip components, clips, and other compound clips. Effectively, each compound clip can be considered a mini project, with its own distinct project settings. Compound clips function just like other clips: You can add them to your project, trim them, retime them, and add effects and transitions.

When you add media (clips) to the contents of a standard clip, the clip automatically becomes a compound clip.

Compound clips have many uses. You can:

  • Simplify a complicated project by creating a separate compound clip for each major section
  • Sync a video clip with one or more audio clips and then combine the clips into a compound clip, to avoid inadvertently moving them out of sync 
  • Open any clip, edit its contents in the timeline, and then close it 
  • Quickly create a compound clip containing the clips in an event, based on the browser sort order 
  • Use a compound clip to create a section of a project with settings different from those of the main project.