Edit technique that shifts source in/out points synchronously while maintaining timeline position, changing only visible clip content.
Technical Details
During execution, the source in-point and source out-point are shifted synchronously – for example, by +24 frames at 24fps, which moves both reference points exactly one second to the right. The clip's timeline position remains at the exact same timecode address. Modern editing systems like Avid Media Composer perform slip edits in real-time, while older systems like early Final Cut Pro versions required render times of 2-8 seconds. The process requires sufficient handle material before the original in-point and after the out-point of the source material.
History & Development
The concept originated in 1989 with the introduction of the Avid/1, the first fully digital editing system. Developers Charlie Steinberg and Bill Warner implemented the slip edit as one of four trim functions (along with ripple, roll, and slide). Steenbeck and Moviola cutters were familiar with similar techniques but had to physically cut and splice. In 1994, Lightworks expanded the functionality to include multi-camera slip edits, and in 2001, Final Cut Pro first integrated slip functions into consumer software.
Practical Application in Film
Christopher Nolan extensively used slip edits in "Dunkirk" (2017) to precisely synchronize the three timelines – editor Lee Smith shifted over 400 clips by an average of 12-36 frames. In dialogue scenes, the slip edit allows for lip-sync adjustments without timeline changes. Action sequences benefit from precise timing correction: an explosion clip can be shifted by 6-8 frames to synchronize exactly with the music beat. This workflow saves 60-80% of the time compared to traditional lift-and-insert methods.
Comparison & Alternatives
Unlike the roll edit, which shifts adjacent edit points, and the slide edit, which moves the clip itself, the slip edit exclusively changes the visible content. Ripple edits, on the other hand, shift the entire subsequent timeline. In Adobe Premiere Pro since CC 2019, the "Advanced Slip" function allows frame-by-frame control over audio offset, while DaVinci Resolve 18 combines slip edits with automatic color matching between shifted frames. For simple timing corrections, the classic slip edit remains the most efficient solution.