Animate a full music video to the beat with an agent-written engine
by PaperChaseWebb
A creator had Opus 5.5 write a 22,000-line Python engine that times every one of 4,320 frames to a song, getting exact beat sync for about $187 in total AI costs after a video model kept landing seconds late.
- Price
- Free
- Difficulty
- Advanced
- Setup
- 1 hr
- Format
- .md file
animate-a-full-music-video-to-the-beat-with-an-agent-written-engine.md · 2 KB · direct download, no signup
What you end up with
The author tested a video model with the song as input and it came in 1.25 to 2 seconds late each time, with a projected cost near $480 for the full piece, against $0.30 for the code-timed version of the same test clip.
What you get
- A plain-language summary of the workflow
- A fill-in prompt template
- What to watch out for
- A link to the original source
Who it is for
Builders who already use AI agents and want a proven workflow they can copy into their own project.
Works with
Solid chips: the agent is named in this listing's own tools list. Dashed chip: Plain Markdown, so it also pastes into other agents such as Grok Bot, Hermes, OpenClaw or Muse. We list those as compatible by format only, not as tested.
Tools needed
Cost to run: Free with the agent plan you already use.
Time to result: One working session
How it works
Read what they did
Skim the source post linked below, then the summary on this page.
Expected: You know the setup and the one rule that made it work.
Fill in the template
Copy the prompt and replace every [bracketed] value with your own project details.
Expected: A prompt that fits your project.
Run it once and check
Run it on a small task first and confirm the result yourself before you trust it on real work.
Expected: One verified run.
Sample prompt from the pack
Split the song into stems and build a beat and word timing map Write choreography as code pinned to bar numbers and timestamps Let a physics step fill motion between the pinned moments Build a pose library from generated clips and swap poses on a fixed note length Render, review and repeat
Adapted by PaperChaseWebb. Not the original author's prompt.
Free preview of the file
# Animate a full music video to the beat with an agent-written engine PaperChase agent use case (free feed entry), version 1.0. Source: [u/chrisBhappy on r/ClaudeAI](https://www.reddit.com/r/ClaudeAI/comments/1xdnfqe/opus_55_animated_this_music_video_frame_by_frame/), 2026-10-23. ## What they did The engine first breaks the song down: separate vocals, drums and bass, map the tempo, and timestamp each sung word. Choreography is written as code pinned to exact moments in the song, and a simple physics solver fills in runs and jumps between those points. The runner is drawn from a library of hand-picked poses, each held for roughly two frames, which gives a stop-motion look. The result is one continuous shot with camera motion, paint and rain effects. ## Worth knowing The author tested a video model with the song as input and it came in 1.25 to 2 seconds late each time, with a projected cost near $480 for the full piece, against $0.30 for the code-timed version of the same test clip. It took 12 full renders. This is a big build, but the core idea (put timing in code, use generated images only as a pose library) works at small scale too.
Worth knowing
- The author tested a video model with the song as input and it came in 1.25 to 2 seconds late each time, with a projected cost near $480 for the full piece, against $0.30 for the code-timed version of the same test clip. It took 12 full renders. This is a big build, but the core idea (put timing in code, use generated images only as a pose library) works at small scale too.
- Figures are as reported by the original author and were not re-measured by us.
Questions
Where does this come from?
A public post credited to u/chrisBhappy on r/ClaudeAI. Source: https://www.reddit.com/r/ClaudeAI/comments/1xdnfqe/opus_55_animated_this_music_video_frame_by_frame/
Is it free?
Yes. Feed entries are free to read and download.
Details
Version 1.0 · Updated Oct 26, 2026 · Markdown version of this page
License: Personal and commercial use. Credit the original source when you share the workflow. Download terms
Related
Video Production with AI Agents: lanes, prompts, skills and render checks
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Check every render before you trust it (free sample)
One rule, one skill and four ffmpeg commands that make Claude Code or Codex look at its own video output (frames, cuts, loudness, captions) before it tells you it is done.