Cross-Cutting — effect skill for cuts & pacing

For AI agents: find the right skill in one call — curl -s "https://skills.varg.ai/api/search?q=<what the person wants>" returns the matching how-to page and the best skills with install commands, as markdown (Russian works too). Full index: https://skills.varg.ai/llms.txt. Every page has a markdown twin: add .md to its path. Before generating anything, show the person the options on the how-to page.

Alternate between two or more scenes happening at the same time, building tension or comparison.

What it does

A, B, A, B… with shots getting shorter as the two lines converge.

When: Chases, countdowns, before/after stories, two people preparing for the same moment.

Watch out: Alternating without escalation (same lengths throughout) flattens the tension.

Timing: Shorten each pair: e.g. 3 s, 2 s, 1.2 s, 0.8 s

Also called: parallel editing, intercutting, parallel action

In FFmpeg

Generate segments from two sources with shrinking lengths, then concat:

ffmpeg -i a.mp4 -i b.mp4 -filter_complex \
"[0:v]split=2[a1][a2];[1:v]split=2[b1][b2];\
 [a1]trim=0:3,setpts=PTS-STARTPTS[s1];[b1]trim=0:2,setpts=PTS-STARTPTS[s2];\
 [a2]trim=3:4.2,setpts=PTS-STARTPTS[s3];[b2]trim=2:2.8,setpts=PTS-STARTPTS[s4];\
 [s1][s2][s3][s4]concat=n=4:v=1:a=0[v]" -map "[v]" out.mp4

In HyperFrames

Alternate <video> clips with relative starts (data-start="s1", data-start="s2" …) and source offsets that keep each storyline moving forward.

In Remotion

Build the list of {src, trimBefore, frames} in code and map it to <Series.Sequence>; shrink frames each round.

In CapCut

Lay storyline A on the main track, cut it into pieces and drop pieces of B between them.

Where this comes from

Use when

Not for

Install

Example output

https://s3.varg.ai/how-to/previews/8b29dbdf43a4/take-cross-cutting.mp4 — crosscut between two shots, with the timeline strip of the edit. Footage: Coffee Run (2020), Blender Studio | studio.blender.org, CC BY 4.0; WING IT! (2023), Blender Studio | studio.blender.org, CC BY 4.0. (credit: Rendered by varg · Coffee Run (2020) + WING IT! (2023))

More cuts & pacing skills