The Timeline: Cuts, Trims & Basic Editing

Video Editing Fundamentals

Chapter 4 · The Timeline: Cuts, Trims & Basic Editing

Chapter 3 got footage imported and organized. This chapter is where actual editing begins — the Edit page's own timeline, and the operations used to cut it together.

The Timeline: Tracks and Clips

Video and audio tracks stack similarly to a concept already familiar from elsewhere — Raster Editing Fundamentals' own layers, or OBS Studio's own Scene/Source stacking. Here, clips are placed along tracks in time rather than space. The playhead marks the current position being viewed or edited.

The Razor Tool: Splitting a Clip

The Razor tool cuts one clip into two separate clips at the playhead's own position — the most basic editing operation, foundational to everything else in this chapter. Premiere Pro calls the identical tool the Razor (or Blade) tool — essentially the same name and function.

Three Kinds of Trim: Ripple, Roll, Slip

A Ripple edit trims a clip's own edge and automatically shifts every subsequent clip on the track to close the resulting gap. A Roll edit adjusts the cut point between two adjacent clips simultaneously — lengthening one while shortening the other by the same amount, without moving anything else on the timeline. A Slip edit changes which portion of the source footage is shown within a clip's own existing duration and position on the timeline, without changing its length or position at all. Three genuinely different operations, easily confused since all three involve "adjusting" a clip in some sense.

Premiere Pro Terminology Mapping

Ripple, Roll, and Slip are used with the exact same names in Premiere Pro — a rare case of near-total terminology parity, unlike some of this course's own earlier comparison points. Worth calling out specifically since it's the exception in this course, not the rule.

Edit type	What moves	What stays fixed
Ripple	Every subsequent clip shifts to close the gap	The trimmed clip's own remaining content
Roll	The shared cut point between two clips	Everything else on the timeline
Slip	Which source footage is shown	The clip's own length and position

The third time this exact mental model has appeared

Video/audio tracks stacking clips is genuinely the third time this site's own courses have used the identical "things arranged in an ordered stack, order matters" mental model — layers in Raster Editing Fundamentals, Sources in a Scene in OBS Studio, and now tracks on a timeline here. Reusable across three completely different pieces of software.

Ripple isn't just "the normal way trimming works"

It's easy to assume Ripple is simply how trimming always behaves, and be genuinely surprised when a simple trim unexpectedly shifts every other clip on the track. Ripple's own automatic gap-closing behavior is a deliberate, powerful feature for maintaining a tight edit with no gaps — but it can also produce an unwanted cascading shift if the editor didn't intend for later clips to move at all. Knowing which trim mode is actually active before trimming avoids this surprise entirely.

Hands-On Exercises

Exercise 1

You want to trim a few frames off the end of one clip and add them to the beginning of the very next clip, adjusting the shared cut point between them without moving anything else on the timeline. Which edit type from this chapter fits, and why?

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Exercise 2

An editor trims the end of a clip expecting only that one clip to change, but every clip after it on the timeline unexpectedly shifts earlier. Using this chapter's own warning box, explain what likely happened.

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Exercise 3

You have a clip on the timeline at exactly the right length and position, but you realize the wrong section of the original source footage is being shown within it. Which edit type from this chapter fits, and why wouldn't Ripple or Roll be appropriate here?

📄 View solution

Chapter 4 Quick Reference

The Razor tool splits one clip into two at the playhead — identical in name and function to Premiere Pro's own tool
Ripple — trims and shifts everything after to close the gap; Roll — adjusts a shared cut point, nothing else moves; Slip — changes which source footage shows, length/position unchanged
Ripple/Roll/Slip use the exact same names in Premiere Pro — a rare case of full terminology parity
Tracks stacking clips is the same ordered-stack mental model as layers (Raster Editing Fundamentals) and Scenes/Sources (OBS Studio)
Know which trim mode is active before trimming — Ripple's automatic gap-closing can cause an unwanted cascading shift