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Beat Sync Editingby iart-ai

Beat Sync Editing Skill.

Turn music and narrative beats into a frame-accurate edit plan.

  • Audio Timing
  • Editing
Download OpenDesignView Usage Guide
Source Review · beat-sync-editingSKILL.md
Task Turn music and narrative beats into a frame-accurate edit plan. Produces A track specification and cumulative beat-marker array. Before You Start It does not supply an NLE or render the finished edit by itself.
Editorial summary · source reviewed 2026-11-02 · not a generated example

01 What It Does

Turn music and narrative beats into a frame-accurate edit plan

Plan phrase-based cuts, beat markers, match cuts, audio overlaps and speed ramps using BPM, frame rate and the track's starting offset.

Source-based workflowNot an execution benchmark

The Working Approach

beat-sync-editing translates music and narrative structure into frame-numbered edit decisions. It records BPM, frame rate and the offset of the first beat, then builds cuts on musical phrases. The result is a timing plan that can be implemented in an editing application or a code-driven timeline.

The Skill also covers what happens around a cut. Match cuts connect shapes or movement, J-cuts introduce the next sound early, and L-cuts let the previous sound continue. Speed ramps and changing shot lengths shape the build toward a climax instead of keeping every shot equally short.

Expected Deliverables

  • A track specification and cumulative beat-marker array.
  • An absolute-frame cut list with transition and audio offsets.
  • A pacing arc and time-remap plan for any speed ramps.
See the Example Brief

From Brief to Review

  1. 01
    Anchor the musical grid

    Establish BPM, output frame rate and the first-beat offset. Frames per beat equals (60 / BPM) × fps: at 120 BPM and 30 fps, each beat spans 15 frames and a four-beat phrase spans 60. Add the track's starting offset and round cumulative positions, not each interval, to avoid drift.

  2. 02
    Shape the sequence

    Establish context, increase energy toward the main moment, and reserve a final hold. Use phrase boundaries for structural cuts and finer subdivisions for occasional accents.

  3. 03
    Specify each seam

    Choose the cut type and matching movement. Record audio leads or trails and describe any eased speed ramp as frame-based retiming.

02 When to Use It

When to Use It

It does not supply an NLE or render the finished edit by itself.

A Good Fit

  • Cuts feel almost on beatThe explicit offset and cumulative frame math help investigate persistent timing errors.
  • An edit needs a code handoffAbsolute cut frames and clip durations can be translated into layers or sequences.

Limits to Check

  • The plan is renderer-agnosticIt does not supply an NLE or render the finished edit by itself.
  • Slow motion needs suitable processingThe source calls for frame blending or optical flow when retiming footage; a timing plan alone cannot prevent interpolation artifacts.

Bring These Inputs

  • Music and timingProvide the audio track, known BPM and any required hit or drop.
  • Clips and narrativeDescribe the footage, key message and the moment that deserves the largest emphasis.
  • Delivery settingsSpecify final duration, frame rate and the editor or code timeline used downstream.

03 Decisions That Matter

Decisions That Matter

  1. Repeatable synchronization

    Beat markers create a concrete reference for evaluating cut alignment.

  2. Purposeful transitions

    A named transition carries a visual or audio reason instead of concealing weak timing.

  3. Readable energy changes

    Longer setup and release holds leave room around the fast section.

04 Try a Focused Brief

Try a Focused Brief

The example brief below has not been tested. Check the skill’s setup before using it.

Review the Source and Setup

Provide the audio track, known BPM and any required hit or drop.

Upstream Source File
https://github.com/iart-ai/motion-design-skills/blob/3c129f769d90a1328c209c386492333c9ac62312/skills/beat-sync-editing/SKILL.md

The reference below opens the upstream instructions. Review the repository setup before using them; it is not an installation command.

Start With One Deliverable

Adapt the scope, source material and constraints in this brief before running the skill.

Example Brief
Create an edit-timing plan for a 24-second product film at 30 fps using my supplied music track. Identify the first-beat offset before calculating the grid. The film should establish the product, show three actions, land the main reveal on the strongest musical accent, and end with a readable brand hold. Use phrase-based cuts and explain any match cut or audio overlap. Give absolute cut frames, clip durations, beat markers and a speed-ramp plan only if the footage supports it. Do not render or invent a BPM measurement if the track cannot be inspected.

Inspect the Result

Check the actual output against these observable criteria.

  • Include the first-beat offset and round cumulative beat positions.
  • Verify the strongest visual and musical accent share the intended frame.
  • Check transition overlaps, readable holds and audio continuity.

OpenDesign provides a local design workspace for coding agents. This listing does not mean the skill is bundled or that its external tools, credentials and software dependencies are included.

Download OpenDesignRead the Quickstart

05 Source and License

Source and License

This page describes the pinned source revision linked below. Upstream behavior and requirements can change.

Source Owner
iart-ai
Repository
iart-ai/motion-design-skills
Skill File
SKILL.md
License
MIT
Reviewed Snapshot
2026-11-02 · 3c129f769d90
Editorial Source Summary
Turn music and narrative beats into a frame-accurate edit plan.

Original summary by OpenDesign, based on the linked source. Repository stars are a dated popularity signal, not skill usage or a quality score.

06 Questions Before You Start

Questions Before You Start

Why can a correct BPM still feel wrong?

The first beat may start after the file begins. A grid anchored to frame zero can be consistently early or late.

Should every beat receive a cut?

The source favors phrase-based structure. Frequent beat-by-beat cuts are reserved for selected high-energy moments rather than the entire sequence.

Can the plan work in Remotion?

The source maps cuts to sequence start and duration values, transitions to overlaps, and speed changes to time-remap curves. Implementation still needs frame and audio checks.

OpenDesign

Keep Your Brief and Design Work Together.

Keep your brief, source material and design work together in a local workspace. Check the skill’s own setup before adding it to your workflow.

Download OpenDesignBrowse Design Skills
Upstream Source File
https://github.com/iart-ai/motion-design-skills/blob/3c129f769d90a1328c209c386492333c9ac62312/skills/beat-sync-editing/SKILL.md