How to Mark Video in iMovie
Individual segments or video clips that make up an entire event look like filmstrips in Apple iMovie, and a typical event has several clips. As you skim your video in iMovie, you’ll prefer certain parts of your footage. You can mark these video frames as favorites while rejecting the other footage.
Video clips are represented by a series of thumbnails, each a frame within a clip. The number of frames that make up a second of video will vary, depending on the video format you chose when shooting. You can select frame ranges to determine the video you’re working with; the range is designated by a yellow border.
To mark your favorite footage: Select the frame range of the video portion you love and click the Mark as Favorite button (the black star) on the toolbar. A green bar appears at the top of the frame range. If you change your mind, click the Unmark button.
To reject a frame range: Click the black X on the toolbar. A red bar appears at the top of the frame range. Once again, click the Unmark button if you change your mind. The videos aren’t deleted until you move them to the Trash (and empty the Trash).
In the small pop up box to the right of the Play buttons, you can sort or filter the video shown in the library. You can show Favorites Only, Favorites and Unmarked, All Clips, or Rejected Only.
You can expand or shorten filmstrips by dragging a thumbnail slider to the right or the left. And you can drag the yellow selection border to change the frame range as well.