media-utils

Included with Lifetime

$97 forever

Internal utility skill for media assembly operations. NOT called directly by users. Used by producer skills (video-producer, podcast-producer, audio-producer, social-producer) to stitch, mix, and assemble final media outputs.

Designscripts

What this skill does


# Media Utilities

**Internal utilities for media assembly. Used by producer skills.**

These scripts wrap FFmpeg to provide reliable media operations.

## Prerequisites

- **FFmpeg** must be installed: `brew install ffmpeg` (macOS) or `apt install ffmpeg` (Linux)
- Check with: `python3 check_ffmpeg.py`

## Available Utilities

### audio_concat.py
Concatenate multiple audio files into one.

```bash
# Simple concatenation
python3 audio_concat.py -i intro.wav segment1.wav outro.wav -o podcast.mp3

# With crossfade between clips
python3 audio_concat.py -i track1.wav track2.wav --crossfade 2.0

# With normalization
python3 audio_concat.py -i *.wav -o mixed.mp3 --normalize
```

### audio_mix.py
Mix voice/narration with background music (with optional ducking).

```bash
# Voice + music with ducking (music lowers when voice plays)
python3 audio_mix.py --voice narration.wav --music background.mp3 -o final.mp3

# Adjust music volume (default: 0.3)
python3 audio_mix.py --voice voice.wav --music music.mp3 --music-volume 0.2

# No ducking
python3 audio_mix.py --voice voice.wav --music music.mp3 --no-duck

# With fade in/out on music
python3 audio_mix.py --voice voice.wav --music music.mp3 --fade-in 2 --fade-out 3
```

### video_concat.py
Concatenate multiple video clips.

```bash
# Simple concatenation
python3 video_concat.py -i clip1.mp4 clip2.mp4 clip3.mp4 -o final.mp4

# With fade transition
python3 video_concat.py -i *.mp4 -o final.mp4 --transition fade --duration 1.0

# Normalize to 1080p
python3 video_concat.py -i *.mp4 -o final.mp4 --resolution 1080p

# Available transitions: fade, dissolve, wipeleft, wiperight, slideup, slidedown
```

### video_audio_merge.py
Add audio track(s) to video.

```bash
# Replace video audio
python3 video_audio_merge.py --video clip.mp4 --audio voiceover.mp3 -o final.mp4

# Add voice + music with ducking
python3 video_audio_merge.py --video clip.mp4 --voice narration.wav --music bg.mp3

# Mix with existing video audio
python3 video_audio_merge.py --video clip.mp4 --audio music.mp3 --mix

# Audio sync offset
python3 video_audio_merge.py --video clip.mp4 --audio audio.mp3 --offset 0.5
```

### video_strip_audio.py
Remove audio from video files (for replacing with custom audio).

```bash
# Strip audio from single file
python3 video_strip_audio.py -i video.mp4 -o silent_video.mp4

# Strip audio from multiple files (batch mode)
python3 video_strip_audio.py -i clip1.mp4 clip2.mp4 clip3.mp4

# Strip with custom output directory
python3 video_strip_audio.py -i *.mp4 --output-dir ./silent/

# Re-encode video instead of copying
python3 video_strip_audio.py -i video.mp4 --reencode
```

### check_ffmpeg.py
Verify FFmpeg installation.

```bash
python3 check_ffmpeg.py
# ✅ FFmpeg is available!
#    ffmpeg version 6.0 ...
```

### report_to_pdf.py
Convert Markdown reports to professional PDF documents.

```bash
# Basic conversion
python3 report_to_pdf.py -i analysis.md -o analysis.pdf

# With custom title and executive style
python3 report_to_pdf.py -i report.md -o report.pdf --title "Q4 Market Analysis" --style executive

# Technical documentation with table of contents
python3 report_to_pdf.py -i docs.md -o docs.pdf --style technical --toc
```

**Available styles:**
| Style | Description |
|-------|-------------|
| `business` | Clean, professional (default) |
| `executive` | Executive summary with larger fonts |
| `technical` | Technical documentation |
| `minimal` | Minimal styling, maximum content |

**Requires:** `pip install markdown weasyprint`

## Usage by Producer Skills

These utilities are called by the producer skills to assemble final outputs:

```python
from pathlib import Path
import subprocess
import sys

# Get path to media-utils
UTILS_PATH = Path(__file__).parent.parent.parent / "media-utils" / "scripts"

def concat_audio(files: list, output: str):
    cmd = [
        sys.executable,
        str(UTILS_PATH / "audio_concat.py"),
        "-i", *files,
        "-o", output
    ]
    subprocess.run(cmd, check=True)
```

## Output Formats

| Utility | Default Output | Options |
|---------|----------------|---------|
| audio_concat | MP3 | Inherits from input |
| audio_mix | MP3 | MP3 |
| video_concat | MP4 (H.264) | MP4 |
| video_audio_merge | MP4 (H.264) | MP4 |
| video_strip_audio | MP4 (copy) | MP4 |

Files: 8

Size: 68.0 KB

Complexity: 57/100

Category: Design

Source: https://github.com/michaelboeding/skills/tree/main/skills/media-utils

Related in Design

contribute

Included

Local-only OSS contribution command center. Auto-refreshes the user's in-flight PR and issue state on invoke so conversations start with full context — no need to brief Claude on what's in flight. Helps the user find issues to contribute to on GitHub, builds per-repo dossiers of what each upstream expects (CLA, DCO, branch convention, AI policy, draft-first, review bots, issue templates), runs deterministic gates before any external action so AI-assisted contributions don't reach maintainers as slop. State is markdown-only: candidate files at ~/.contribute-system/candidates/, repo dossiers at ~/.contribute-system/research/, append-only event log at ~/.contribute-system/log.jsonl. No database, no cloud calls. Use when the user asks about their PRs / issues / contributions, wants to find new work to take on, claim an issue, build/refresh a repo's dossier, or draft a Design Issue or PR. Trigger with "/contribute", "what's my PR status", "find a contribution", "claim issue X", "draft a Design Issue for Y", "refresh dossier for Z".

Designscripts

architectural-analysis

Included

User-triggered deep architectural analysis of a codebase or scoped subtree across eight modes — information architecture, data flow, integration points, UI surfaces, interaction patterns, data model, control flow, and failure modes. This skill should be used when the user asks to "diagram this codebase," "map the architecture," "show the data flow," "give me an ERD," "trace control flow," "find the integration points," "verify the layout pattern," "audit the UX architecture," or any similar request whose primary deliverable is mermaid diagrams plus cited reports under docs/architecture/. Dispatches haiku/sonnet sub-agents in parallel for per-mode exploration, then verifies every citation mechanically before any node lands in a diagram. Not for one-off prose explanations of code (use code-explanation) or for high-level system design from scratch (use system-design).

Designscripts

mcp

Included

Model Context Protocol (MCP) server development and tool management. Languages: Python, TypeScript. Capabilities: build MCP servers, integrate external APIs, discover/execute MCP tools, manage multi-server configs, design agent-centric tools. Actions: create, build, integrate, discover, execute, configure MCP servers/tools. Keywords: MCP, Model Context Protocol, MCP server, MCP tool, stdio transport, SSE transport, tool discovery, resource provider, prompt template, external API integration, Gemini CLI MCP, Claude MCP, agent tools, tool execution, server config. Use when: building MCP servers, integrating external APIs as MCP tools, discovering available MCP tools, executing MCP capabilities, configuring multi-server setups, designing tools for AI agents.

Designscripts

react-native-skia

Included

Design, build, debug, and optimise high-polish animated graphics in React Native or Expo using @shopify/react-native-skia, Reanimated, and Gesture Handler. Use when the user wants canvas-driven UI, shaders, paths, rich text, image filters, sprite fields, Skottie, video frames, snapshots, web CanvasKit setup, or performance tuning for custom motion-heavy elements such as loaders, hero art, cards, charts, progress indicators, particle systems, or gesture-driven surfaces. Also use when the user asks for fluid, glow, glass, blob, parallax, 60fps/120fps, or GPU-friendly animated effects in React Native, even if they do not explicitly say "Skia". Do not use for ordinary form/layout work with standard views.

Designscripts

plaid

Included

Product Led AI Development — guides founders from idea to launched product. Six capabilities: Idea (discover a product idea), Validate (pressure-test the idea against fatal flaws, problem reality, competition, and 2-week MVP feasibility), Plan (vision intake + document generation), Design (translate image references into a design.md spec), Launch (go-to-market strategy), and Build (roadmap execution). Use when someone says "PLAID", "plaid idea", "help me find an idea", "product idea", "idea from my business", "idea from my expertise", "plaid validate", "validate my idea", "pressure-test", "is this idea good", "find fatal flaws", "validate the problem", "plan a product", "define my vision", "generate a PRD", "product strategy", "plaid design", "design from image", "translate image to design", "create design.md", "extract design tokens", "plaid launch", "go-to-market", "launch plan", "GTM strategy", "launch playbook", "plaid build", "build the app", "start building", or "execute the roadmap".

Designscripts

nextjs-framer-motion-animations

Included

Adds production-safe Motion for React or Framer Motion animations to Next.js apps, including reveal, hover and tap micro-interactions, whileInView, stagger, AnimatePresence, layout and layoutId transitions, reorder, scroll-linked UI, and lightweight route-content transitions. Use when the user asks to add, refactor, or debug Motion or Framer Motion in App Router or Pages Router codebases, especially around server/client boundaries, reduced motion, LazyMotion, bundle size, hydration, or route transitions. Avoid for GSAP-style timelines, WebGL or 3D scenes, heavy scroll storytelling, or CSS-only effects unless Motion is explicitly requested.

Designscripts