How do I install the Speed Up skill?

Run npx skillmds@latest add jperrello/speed-up in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Speed Up safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Speed Up?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Speed Up free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Speed Up?

jperrello (@jperrello) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Speed Up

Name: Speed Up
Author: jperrello

Globally retime a finished short by SPEED (default 1.25x) — the LAST step of the per-span edit chain. Video setpts + pitch-corrected audio atempo, so every relative beat (captions, zoom punches, b-roll windows, CTA, end-card) compresses uniformly and stays in sync. Deterministic, non-fatal. SPEED=1 or SPEED_UP=0 passes through.

jperrello 7eb9353 2 files · 4.1 KB Updated Sep 17, 2026

Coding & Dev Tools

Install

Press C to copy

$ npx skillmds@latest add jperrello/speed-up

Installs into ~/.claude/skills (or .claude/skills inside a project). Restart Claude Code to pick it up.

Download .zip

＋ Add to collection

README badge

[![SkillMD](https://skillmd.com/badge/jperrello/speed-up.svg)](https://skillmd.com/skills/jperrello/speed-up)

Trust & safety

Audits pending

Not yet audited · commit 7eb9353

Works with: Claude Code Claude.ai OpenAI Codex +

File contents

speed-up

Final retime of a finished short. Runs AFTER end-card and BEFORE qc-clip so the QC gate and visual-cadence measure (and save-local saves) the actual delivered, sped-up clip.

speed-up.sh <in.mp4> <out.mp4> [speed=1.25]

speed — playback multiplier; 1.25 ships ~20% faster. Read from arg 3 or the SPEED env (default 1.25).
Video is retimed with setpts=PTS/SPEED; audio with atempo (chained into 0.5–2.0 stages for out-of-range speeds) so pitch is preserved.
Because it is a single uniform retime applied last, ALL upstream relative timing is preserved — nothing else in the pipeline needs to know about it. Note the cold-open title hold (TITLE_SWAP) is set pre-speed, so its on-screen time is TITLE_SWAP / SPEED.
Deterministic (no Claude), idempotent (.spmeta mtime+param signature), non-fatal (probe/ffmpeg failure → passthrough copy).
SPEED=1 or SPEED_UP=0 → passthrough.

jperrello/C0BALT_CUT/tree/main/.claude/skills/speed-up commit 7eb9353e72

Frequently asked questions

npx skillmds@latest add jperrello/speed-up