Velocity Edit — effect skill for transitions

For AI agents: find the right skill in one call — curl -s "https://varg.ai/how-to/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://varg.ai/how-to/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.

Trend: speed curves on every clip (fast-slow-fast) synced to the beat, often with shake and flash on hits.

What it does

Built on Beat Freeze Cut by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

Each clip rushes in, drops into slow motion on the beat and rushes out; transitions are hidden in the fast parts.

When: Dance, car, sport, gaming and fan edits on TikTok/Reels.

Watch out: Footage below 60 fps for the slow parts; curves that ignore the beat.

Timing: Fast parts 2–5×, slow parts 0.2–0.5×, slow point exactly on the beat

Also called: velocity, velocity transition, speed curve edit, Montage curve, Hero curve, Bullet curve

In FFmpeg

Per clip: 3× in, 0.4× on the beat, 3× out, then concat clips (pitch kept by atempo; often the music replaces clip audio):

ffmpeg -i clip.mp4 -filter_complex \
"[0:v]split=3[s1][s2][s3];\
 [s1]trim=0:1.2,setpts=(PTS-STARTPTS)/3[v1];\
 [s2]trim=1.2:1.6,setpts=(PTS-STARTPTS)/0.4,minterpolate=fps=60[v2];\
 [s3]trim=1.6:3,setpts=(PTS-STARTPTS)/3[v3];\
 [v1][v2][v3]concat=n=3:v=1:a=0,fps=30[v]" -map "[v]" -an part.mp4

In HyperFrames

rate lane in data-automation with points like {t:0,v:3},{t:0.4,v:0.4},{t:0.8,v:3}; Studio speed presets include Montage, Hero, Bullet, Jump cut, Flash in, Flash out.

In Remotion

Per-frame speed function → accumulated trimBefore (Remotion speed-ramp snippet), with the slow point at the beat frame; add shake/flash overlays on the beat.

In CapCut

Speed → Curve → Montage / Hero / Bullet / Jump Cut / Flash In / Flash Out (or Custom), align the slow point to Beats markers, then add Shake/Flash effects on hits.

Ready-made components

Where this comes from

Use when

Not for

Install

Example output

https://s3.varg.ai/how-to/previews/311cc9adf898/take-velocity-edit.mp4 — stutter between two shots, with the timeline strip of the edit. Footage: WING IT! (2023), Blender Studio | studio.blender.org, CC BY 4.0; Coffee Run (2020), Blender Studio | studio.blender.org, CC BY 4.0. (credit: Rendered by varg · WING IT! (2023) + Coffee Run (2020))

More transitions skills

Run the generation on varg

varg is one API key for the models these skills drive — Seedance 2.5, Kling 4, Veo 3.1, Wan 3, Nano Banana 2.1, GPT Image 2.5, ElevenLabs v4 and 200+ more — billed in credits, with a cost estimate before anything runs.