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video-assemble (Final Video Assembly)

Final-stage skill that mixes narration audio onto source video with ducking, generates and burns subtitles, and normalizes loudness into a finished recap file.

Image & VideoAdvanced★ 470⑂ 86AI score 7/10Last updated: Aug 24, 2026

What it does

  • Places each narration audio segment onto the source video timeline at exact positions from tts_meta.json.
  • Ducks the original audio inside narration windows, with fixed / sidechain / zone ducking modes and configurable fades.
  • Generates subtitles.srt plus subtitles.ass, burning them in by default (--no-burn-subtitles to disable).
  • Normalizes final loudness to a target LUFS and emits verification artifacts: timeline.json, assembly_manifest.json, assembly_qc.json.
  • Optionally exports an editable CapCut/剪映 draft project referencing the real source clips.

Who it's for

  • Creators mass-producing recap/commentary videos through an automated pipeline.
  • Video engineers who want ffmpeg mixing and subtitle rendering handled reproducibly in code.
  • Users already running the sibling video-recap skills (script → TTS → cut editing) from the same repo.

Examples

  • "Assemble source.mp4 with the narration in work_dir and burn the subtitles" → produces recap_*.mp4.
  • "Original dialogue matters in this scene: reduce ducking depth and add no BGM" → tune SPEECH_DUCKING_VOLUME, leave BGM_PATH unset.
  • "I want to polish the result in CapCut" → run with --export-jianying --source-video orig.mp4.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/zenstory-ai/video-recap-skills/HEAD/skills/video-assemble/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/video-assemble folder from the GitHub repo zenstory-ai/video-recap-skills into my ~/.claude/skills/zenstory-ai-video-assemble/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/zenstory-ai/video-recap-skills.git && mkdir -p ~/.claude/skills && cp -r video-recap-skills/skills/video-assemble ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and go to your working directory.
  2. Clone the repo: git clone https://github.com/zenstory-ai/video-recap-skills.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r video-recap-skills/skills/video-assemble ~/.claude/skills/
  5. Since this is the last pipeline stage, also copy the upstream skills from the repo (scripting, TTS, cut editing).
  6. Check prerequisites: python3 --version, and ffmpeg -filters | grep subtitles to confirm libass support (burn-in fails without it).
  7. Restart Claude Code, then ask for "assemble the video" / "burn subtitles" to trigger it.
View source on GitHub ↗License: MIT