Agent skill
media-composition
Combine multiple media assets (GIFs, videos) into composite tutorials. Supports vertical/horizontal layouts and sequential stitching. Triggers: combine media, stitch gifs, composite, merge recordings Use when: combining terminal and browser recordings into a single tutorial
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/design/media-composition-athola-claude-night-market
SKILL.md
Media Composition Skill
Combine multiple media assets (GIFs, videos, images) into composite outputs for detailed tutorials and documentation.
Overview
This skill orchestrates the combination of separately generated media assets into unified outputs. It reads manifest files that define components and their composition rules, validates all inputs exist, and executes FFmpeg commands to produce the final composite media.
Required TodoWrite Items
- Parse composition manifest file
- Validate all component outputs exist
- Determine composition layout and parameters
- Execute FFmpeg composition command
- Verify combined output file created
- Report composition metrics (file size, dimensions)
Manifest Format
Manifests define the components to combine and how to arrange them:
# Example manifest: tutorials/mcp.manifest.yaml
name: mcp
title: "MCP Server Integration"
components:
- type: tape
source: mcp.tape
output: assets/gifs/mcp-terminal.gif
- type: playwright
source: browser/mcp-browser.spec.ts
output: assets/gifs/mcp-browser.gif
requires:
- "skrills serve"
combine:
output: assets/gifs/mcp-combined.gif
layout: vertical
options:
padding: 10
background: "#1a1a2e"
Manifest Schema
| Field | Type | Required | Description |
|---|---|---|---|
name |
string | Yes | Identifier for the composition |
title |
string | No | Human-readable title |
components |
array | Yes | List of media components to combine |
components[].type |
string | Yes | Source type: tape, playwright, static |
components[].source |
string | Yes | Path to source file |
components[].output |
string | Yes | Path to generated output |
components[].requires |
array | No | Commands to run before generation |
combine.output |
string | Yes | Path for combined output |
combine.layout |
string | Yes | Layout mode (see table below) |
combine.options |
object | No | Layout-specific options |
Step-by-Step Process
1. Parse Manifest File
# Read and validate manifest structure
yq eval '.' manifest.yaml
# Extract component outputs
yq eval '.components[].output' manifest.yaml
2. Validate Component Outputs
# Check all required files exist
for output in $(yq eval '.components[].output' manifest.yaml); do
if [[ ! -f "$output" ]]; then
echo "ERROR: Missing component: $output"
exit 1
fi
done
3. Execute FFmpeg Composition
Based on the layout specified in the manifest, execute the appropriate FFmpeg command.
4. Verify Combined Output
# Verify output exists and has content
if [[ -f "$output" && -s "$output" ]]; then
echo "Composition successful: $output"
ls -lh "$output"
else
echo "ERROR: Composition failed"
exit 1
fi
FFmpeg Composition Commands
Vertical Stacking
Stack GIFs/videos top to bottom:
ffmpeg -i top.gif -i bottom.gif \
-filter_complex "[0:v][1:v]vstack=inputs=2" \
-y output.gif
With padding between:
ffmpeg -i top.gif -i bottom.gif \
-filter_complex "[0:v]pad=iw:ih+10:0:0:color=black[top];[top][1:v]vstack=inputs=2" \
-y output.gif
Horizontal Stacking
Stack GIFs/videos side by side:
ffmpeg -i left.gif -i right.gif \
-filter_complex "[0:v][1:v]hstack=inputs=2" \
-y output.gif
Sequential Concatenation
Play GIFs/videos one after another:
# Create concat list file
cat > concat_list.txt << EOF
file 'first.gif'
file 'second.gif'
file 'third.gif'
EOF
# Concatenate
ffmpeg -f concat -safe 0 -i concat_list.txt \
-y output.gif
Grid Layout (2x2)
ffmpeg -i tl.gif -i tr.gif -i bl.gif -i br.gif \
-filter_complex "[0:v][1:v]hstack=inputs=2[top];[2:v][3:v]hstack=inputs=2[bottom];[top][bottom]vstack=inputs=2" \
-y output.gif
With Background Color
ffmpeg -i top.gif -i bottom.gif \
-filter_complex "color=c=#1a1a2e:s=800x600[bg];[bg][0:v]overlay=0:0[tmp];[tmp][1:v]overlay=0:300" \
-y output.gif
Layout Options
| Layout | Description | Options |
|---|---|---|
vertical |
Stack top to bottom | padding, background, align |
horizontal |
Stack left to right | padding, background, align |
sequential |
Play in order | transition, duration |
grid |
N x M grid arrangement | rows, cols, padding |
overlay |
Layer on top of each other | position, opacity |
pip |
Picture-in-picture | corner, scale, margin |
Layout Option Details
| Option | Type | Default | Description |
|---|---|---|---|
padding |
int | 0 | Pixels between components |
background |
string | "black" | Background color (hex or name) |
align |
string | "center" | Alignment: left, center, right |
transition |
string | "none" | Transition type: fade, wipe, none |
scale |
float | 0.25 | Scale factor for PiP |
corner |
string | "br" | PiP corner: tl, tr, bl, br |
Example Compositions
Terminal + Browser Tutorial
name: plugin-demo
components:
- type: tape
source: demo.tape
output: terminal.gif
- type: playwright
source: browser.spec.ts
output: browser.gif
combine:
output: demo-combined.gif
layout: vertical
options:
padding: 5
background: "#0d1117"
Side-by-Side Comparison
name: before-after
components:
- type: static
source: before.gif
output: before.gif
- type: static
source: after.gif
output: after.gif
combine:
output: comparison.gif
layout: horizontal
options:
padding: 10
Picture-in-Picture
name: pip-demo
components:
- type: tape
source: main.tape
output: main.gif
- type: playwright
source: overlay.spec.ts
output: overlay.gif
combine:
output: pip-demo.gif
layout: pip
options:
corner: br
scale: 0.3
margin: 20
Exit Criteria
- Manifest file parsed successfully
- All component outputs validated as existing
- FFmpeg composition command executed without errors
- Combined output file exists and has non-zero size
- Output dimensions and duration logged
- Temporary files cleaned up
Recommended Agent Skills
Expand your agent's capabilities with these related and highly-rated skills.
majiayu000/claude-skill-registry
agent-ops-spec
Manage specification documents in .agent/specs/. Use when user provides requirements, acceptance criteria, or feature descriptions that need to be tracked and validated against implementation.
majiayu000/claude-skill-registry
agent-ops-state
Maintain .agent state files. Use at session start, after meaningful steps, and before concluding: read/update constitution/memory/focus/issues/baseline consistently.
majiayu000/claude-skill-registry
agent-ops-spec
Manage specification documents in .agent/specs/. Use when user provides requirements, acceptance criteria, or feature descriptions that need to be tracked and validated against implementation.
majiayu000/claude-skill-registry
agent-ops-testing
Test strategy, execution, and coverage analysis. Use when designing tests, running test suites, or analyzing test results beyond baseline checks.
majiayu000/claude-skill-registry
agent-ops-testing
Test strategy, execution, and coverage analysis. Use when designing tests, running test suites, or analyzing test results beyond baseline checks.
majiayu000/claude-skill-registry
agent-ops-state
Maintain .agent state files. Use at session start, after meaningful steps, and before concluding: read/update constitution/memory/focus/issues/baseline consistently.
Didn't find tool you were looking for?