Trim
Like editing the Council of Elrond down to the bit where they actually decide something and move on.
Trimming in video editing refers to the adjustment of a clip's in point (where it begins) or out point (where it ends) to change how much of the source recording is used in the timeline. When you trim the head of a clip (the beginning), you're moving the in point later into the source recording, removing frames from the start of the clip. When you trim the tail (the end), you're moving the out point earlier, removing frames from the end. Trimming is distinct from cutting (which splits a clip at a specific point into two separate clips); trimming adjusts the boundary of an existing clip at one of its edges.
The precision required in trimming varies dramatically by context and clip type. Trimming a establishing shot of an office environment might be done loosely — any 3 seconds of the 15-second source recording will serve the purpose. Trimming a dialogue cut requires frame-accurate precision: the in point should be one or two frames before the speaker's mouth opens (cutting too late cuts off the beginning of the word), and the out point should be placed at the last frame of audio for the word before the breath or pause (cutting too early clips the word, too late keeps the breath). Trimming a reaction shot to land on exactly the right expression might involve examining the clip frame by frame to find the precise moment when the expression hits its peak.
For editors working in NLEs, trimming is the most frequently performed operation after the initial assembly cut. Every clip in a timeline is the result of trimming decisions: which portion of the source recording to use, exactly where to begin, and exactly where to end. Different trim modes (ripple trim, roll trim, slip, slide) give the editor precise control over how the trimmed clip interacts with its neighbors in the sequence. Professional editors develop fast, accurate trimming habits that allow them to find and set precise in and out points quickly — using keyboard shortcuts, the JKL (playback control) keys for frame-by-frame navigation, and muscle memory for the specific NLE's interface — because the quality of an edit is largely a function of the quality of its trim decisions.
Related terms
- Ripple Edit— Remove one scene and everything shifts — like destroying a Horcrux: the timeline changes whether you intended it to.
- Roll— Moving both clip edges simultaneously — the Ent who deliberates carefully before acting on the whole forest.
- Slip Edit— Changing which part of a clip plays without moving it — editing Frodo's memory while he's inside the Pensieve.
- Cut— 'You shall not pass' — except it already did, and you never noticed the edit.
- Timeline— The Fellowship's route from the Shire to Mount Doom — every moment in sequence, every clip in its place.