claude-video-kit

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claude-video-kit

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Agent Skill + Remotion pipeline: brief/script → review receipt → narrated 9:16 explainer. RC: video-explainer skill.

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# claude-video-kit

**English** · [中文](./README.zh.md) · [README.en.md](./README.en.md)

Turn a research brief or JSON script into a **vertical explainer** — TTS + caption alignment + Remotion — without opening a timeline editor.

**Who it's for:** people already writing research / technical explainers in Claude Code or Cursor who want a repeatable 9:16 pipeline with a **pre-render review gate**.  
**Who it's not for:** one-click “topic → AI b-roll Short” factories. We optimize for auditable scripts and reproducible motion graphics, not generative video lottery.

> **[v0.3.0-rc.1](https://github.com/runesleo/claude-video-kit/releases/tag/v0.3.0-rc.1) (public release candidate):** installable `video-explainer` Agent Skill. Independent review receipt must bind to the exact `script.json` before render. Skill never uploads or publishes.

## Fastest first success: Agent Skill

```bash
git clone https://github.com/runesleo/claude-video-kit.git
cd claude-video-kit
npm ci --prefix remotion
npx skills add runesleo/claude-video-kit --skill video-explainer
npm run doctor -- --output /tmp/video-explainer-first-success
npm run demo -- --output /tmp/video-explainer-first-success
```

The Skill orchestrates this local clone (it does not bundle Remotion). Demo creates a script-bound pass receipt, uses macOS `say` as an explicitly **demo-quality** voice, renders 1080×1920, and runs the shorts verifier — no API key, no upload. For real projects: `review` then `render`; `fix` / `block` / missing / stale receipts cannot start rendering. The six review checks are product-defined; pass/fail is judged by the reviewer — the tool enforces process, not truth.

> Editing scripts or compositions? Read [docs/DESIGN.md](docs/DESIGN.md) first — it's the design system contract.

## What you get

- **One-command pipeline** — `./scripts/render.sh <project>` runs TTS, alignment, metadata build, and Remotion render end-to-end.
- **Metadata-driven timing** — slide durations computed from actual WAV length, no manual frame counting.
- **Composable slides** — `cover`, `text`, `code` compositions out of the box, each drop-in replaceable.
- **Dual TTS backends** — Fish Audio API (default, excellent Chinese cloning) or local IndexTTS2 (free, GPU required).
- **Word-level captions** — faster-whisper produces frame-accurate caption tracks that burn into the render.
- **Remotion Studio hot reload** — iterate on compositions in React with live preview.

## How it works

```
script.json ──▶ TTS ──▶ *.wav ──▶ Whisper align ──▶ captions.json
                                                            │
                                  build-metadata ◀──────────┘
                                         │
                                         ▼
                                  Remotion render ──▶ out/full.mp4
```

**Input** (`examples/my-first/script.json`):
```json
{
  "title": "My first AI video",
  "fps": 30,
  "width": 1080,
  "height": 1920,
  "slides": [
    { "type": "cover", "title": "Hello world", "subtitle": "in 10 seconds" },
    { "type": "text",  "text": "This is my first AI-rendered video.",
      "voice_text": "This is my first AI-rendered video." },
    { "type": "code",  "language": "ts",
      "code": "const video = await kit.render(script);",
      "voice_text": "One function call, one video file." }
  ]
}
```

**Run**:
```bash
./scripts/render.sh examples/my-first
```

**Output**: `examples/my-first/out/full.mp4` — a 1080×1920 vertical video with narration and captions, timed exactly to the generated audio.

## Setup

**Clone and install:**
```bash
git clone https://github.com/runesleo/claude-video-kit.git
cd claude-video-kit
cd remotion && npm install && cd ..
pip install -r scripts/requirements.txt
cp .env.example .env   # fill FISH_AUDIO_API_KEY, FISH_AUDIO_VOICE_ID
```

**Any AI coding agent:**
Point your agent at `docs/quickstart.md` and `examples/schoger-demo/`. The whole pipeline is four scripts — an agent can read, modify, and run it without framework knowledge.

## Requirements

- Node 20+
- Python 3.10+
- ffmpeg (`brew install ffmpeg`)
- Fish Audio API key (default TTS) — or skip it and use the macOS `say` fallback for local testing
- (Optional) CUDA GPU if you want to run IndexTTS2 locally

New to Fish Audio? [Create an account here](https://fish.audio/?code=VCG6XOES4XIY2) — best-in-class Chinese voice cloning with a trivial API.

That's it. No video editor, no recording gear, no timeline.

## Supported slide types

| Type | Purpose | Required fields | Optional fields |
|------|---------|----------------|----------------|
| `cover` | Opening / closing cards | `title` | `subtitle` |
| `text` | Narrated text slide | `text`, `voice_text` | `voice`, `textMode` (`"hero"` for big-font shorts hook), `textReveal` (`"spring"` \| `"typewriter"`), `accentColor` |
| `code` | Code-as-video blocks | `code`, `language`, `voice_text` | `voice` |
| `numberHero` | Big-number data hook (shorts) | `heroValue` | `heroLabel`, `heroBadge`, `heroPrefix`, `heroSuffix`, `heroAccentColor` |

**`voice_text`** is the narration script — kept separate from on-screen `text` so your voice-over can be more natural than what the slide shows. **`voice`** overrides the default Fish Audio voice ID for that slide.

Add your own slide type by dropping a new composition into `remotion/src/compositions/` and registering it in `Root.tsx`. See `docs/quickstart.md`.

## Shorts pipeline (vertical 9:16)

Phase 1 adds a vertical short-video pipeline: 1080×1920 canvas, dense motion, big text — built for YouTube Shorts / 抖音 / TikTok / 小红书 / B 站 Shorts. Set `"preset": "shorts"` in metadata to flip canvas + font scale in one place; render normally, then run `node scripts/verify-shorts.mjs <out.mp4>` for an objective 4-gate acceptance check (canvas, ≤60s, scene rhythm, hook entrance). See [`docs/SHORTS_PIPELINE.md`](docs/SHORTS_PIPELINE.md) for slide-type schema, captions config, and rhythm guidance.

## Examples in this repo

- **`examples/my-first/`** — 3-slide starter template. Copy this folder, edit `script.json`, render. The fastest way to get a working video.
- **`examples/schoger-demo/`** — the script behind [my first AI-generated short on X](https://x.com/runes_leo). A worked example of a real shipped video, kept for reference (assets not included, only the script).

## Verified

This release was end-to-end tested on macOS (Apple Silicon) with `examples/my-first`. The shipped pipeline produces a **1080×1920 @ 30fps, 8 seconds, 442 KB** vertical mp4 — narration via Fish Audio (or `say` fallback if no API key), captions via Whisper, render via Remotion. See `docs/quickstart.md` for first-run notes (including China network setup).

## Known limitations (v0.1)

- **The `say` fallback is rough — use Fish Audio for anything you'll publish.** Without an API key the pipeline degrades to macOS `say`, which is fine for "does my pipeline run end-to-end" but ships with two real annoyances: (a) it can't disambiguate Chinese homographs, e.g. `行` in `一行代码` gets read as `háng` instead of `xíng`; (b) Whisper's `base` model struggles to align robotic synthetic voices, so captions drift by a beat. Both vanish with a real Fish Audio voice.
- No automatic cover generator — covers are whatever the `cover` slide renders
- No B-roll / video clip support — slides are still-frame + audio + captions
- Single voice per video (per-slide voice override is in the schema but undertested)
- IndexTTS2 backend is a placeholder — script is documented, CUDA wiring is left to the user
- Chinese is the primary tested language; other languages work but captioning quality scales with Whisper model size (`base` → `medium` → `large-v3`)

## What's new in v0.2 — post-render pipeline

The v0.1 pipeline stopped at `out/full.mp4`. v0.2 adds the "every time you make
a video, you end up redoing this" steps into composable scripts you can chain
or ignore:

- **`scripts/prepend-cover.sh`** — prepend a still-image cover clip (default
  3s) to the rendered video. Probes the main video's width/height/fps and
  matches them exactly so concat stays lossless. Falls back to re-encode only
  if codec params differ.
- **`scripts/shift-subtitles.py`** — shift every timestamp in an `.srt` by a
  fixed offset. Pair with `prepend-cover.sh` when you need captions to stay
  aligned after adding an intro.
- **`scripts/build-distribute-pack.mjs`** — emit per-platform upload packages
  (Bilibili / YouTube / Xiaohongshu / Douyin) with chapter timestamps derived
  from `metadata.json`. Supports a blacklist-based compliance pass that strips
  regulator-sensitive words while keeping brand names — stripping brands costs
  vertical-search discoverability.
- **Pre-render review gate** (see [`docs/pre-render-review.md`](docs/pre-render-review.md))
  — a manual convention: before TTS + render, have a second model read the
  script. TTS + render costs ~30 min per iteration; 5 min of review usually
  avoids 2 hours of rerun.

Typical chained usage:

```bash
# 1. Render as usual (v0.1)
./scripts/render.sh examples/my-first

# 2. Prepend cover
./scripts/prepend-cover.sh \
  --cover my-cover.png \
  --video examples/my-first/out/full.mp4 \
  --duration 3 \
  --out examples/my-first/out/full-with-cover.mp4

# 3. Generate per-platform packages (chapters shift with the intro automatically)
node ./scripts/build-distribute-pack.mjs examples/my-first --intro-offset 3
```

`shift-subtitles.py` is an optional utility for the case where you keep a
separate `.srt` file outside the v0.1 pipeline (e.g. exported from Whisper
and used as an overlay). The v0.1 pipeline burns captions during Remotion
render, so most users don't need it.

```bash
./scripts/shift-subtitles.py \
  --input path/to/captions.srt \
  --offset-seconds 3 \
  --output path/to/captions-with-intro.srt
```

Each script is self-contained and independently runnable — use the ones you
need, skip the rest.

## Roadmap

**Pipeline**
- [ ] v0.3 — AI-generated B-roll clips (SDXL / video models for visual variety)
- [ ] v0.4 — Auto cover image generator (1080×1920, platform-aware)
- [ ] v0.5 — Multi-voice conversations (multiple voice IDs per script)

**Compositions**
- [ ] Chart slide (render data as animated SVG)
- [ ] Diff slide (before/after comparison, Schoger-style)
- [ ] Diagram slide (Mermaid → animated reveal)

**Tooling**
- [ ] Web UI — non-coders can edit scripts in a browser
- [ ] `kit init` CLI — scaffold new video projects without copying examples

**API** (planned)
- [ ] REST endpoint for render-as-a-service — POST a script, receive an MP4

## About the author

*Leo ([@runes_leo](https://x.com/runes_leo)) — AI × Crypto independent builder. Trading on [Polymarket](https://polymarket.com/?r=githuball&via=runes-leo&utm_source=github&utm_content=claude-video-kit), building data and trading systems with Claude Code and Codex.*

[leolabs.me](https://leolabs.me) — writing · community · open-source tools · indie projects · all platforms.

[X Subscription](https://x.com/runes_leo/creator-subscriptions/subscribe) — paid content weekly, or just buy me a coffee 😁

*Learn in public, Build in public.*

## License

MIT

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