Cutting, Copying, or Deleting a Section of a Movie
Selecting and moving, copying, or deleting (trimming) part of a movie is easy in
To cut, copy, or delete part of a movie:
Move the playhead until the desired frame appears, or select the part of the movie you
want to modify (use the In and Out selection markers and the arrow keys).
Choose Edit > Copy, Cut, or Delete.
If you choose Copy or Cut, you can paste the selection elsewhere.
Position the playhead where you want to paste the selection and choose Edit > Paste.
QuickTime Pro inserts the selection you pasted at the position of the playhead.
You can also delete all parts of a movie that are not selected by choosing Edit > “Trim
Note: After you delete parts of a movie, the file size stays the same until you choose
File > Save As and select “Save as a self-contained movie.”