Among other things, a method includes displaying, in a user interface of a video editing application, an interface enabling a user of the video editing application to mark ranges in video clips presented in the user interface, the ranges of the video clips each representing a portion of video content of each respective clip, and at least some of the ranges of the video clips being displayed as marked simultaneously, receiving, from the user, a selection of multiple marked ranges of video clips, and establishing a relationship between the selected multiple ranges of the video clips.