ratacat/feature-video

Arguments

[PR number or 'current'] [optional: base URL, default localhost:3000]

Feature Video Walkthrough

<command_purpose>Record a video walkthrough demonstrating a feature, upload it, and add it to the PR description.</command_purpose>

Introduction

<role>Developer Relations Engineer creating feature demo videos</role>

This command creates professional video walkthroughs of features for PR documentation:

• Records browser interactions using agent-browser CLI
• Demonstrates the complete user flow
• Uploads the video for easy sharing
• Updates the PR description with an embedded video

Prerequisites

<requirements> - Local development server running (e.g., `bin/dev`, `rails server`) - agent-browser CLI installed - Git repository with a PR to document - `ffmpeg` installed (for video conversion) - `rclone` configured (optional, for cloud upload - see rclone skill) </requirements>

Setup

Check installation:

command -v agent-browser >/dev/null 2>&1 && echo "Installed" || echo "NOT INSTALLED"

Install if needed:

npm install -g agent-browser && agent-browser install

See the agent-browser skill for detailed usage.

Main Tasks

1. Parse Arguments

<parse_args>

Arguments: $ARGUMENTS

Parse the input:

• First argument: PR number or "current" (defaults to current branch's PR)
• Second argument: Base URL (defaults to http://localhost:3000)

# Get PR number for current branch if needed
gh pr view --json number -q '.number'

</parse_args>

2. Gather Feature Context

<gather_context>

Get PR details:

gh pr view [number] --json title,body,files,headRefName -q '.'

Get changed files:

gh pr view [number] --json files -q '.files[].path'

Map files to testable routes (same as playwright-test):

| File Pattern | Route(s) | |-------------|----------| | app/views/users/* | /users, /users/:id, /users/new | | app/controllers/settings_controller.rb | /settings | | app/javascript/controllers/*_controller.js | Pages using that Stimulus controller | | app/components/*_component.rb | Pages rendering that component |

</gather_context>

3. Plan the Video Flow

<plan_flow>

Before recording, create a shot list:

1. Opening shot: Homepage or starting point (2-3 seconds)
2. Navigation: How user gets to the feature
3. Feature demonstration: Core functionality (main focus)
4. Edge cases: Error states, validation, etc. (if applicable)
5. Success state: Completed action/result

Ask user to confirm or adjust the flow:

**Proposed Video Flow**

Based on PR #[number]: [title]

1. Start at: /[starting-route]
2. Navigate to: /[feature-route]
3. Demonstrate:
   - [Action 1]
   - [Action 2]
   - [Action 3]
4. Show result: [success state]

Estimated duration: ~[X] seconds

Does this look right?
1. Yes, start recording
2. Modify the flow (describe changes)
3. Add specific interactions to demonstrate

</plan_flow>

4. Setup Video Recording

<setup_recording>

Create videos directory:

mkdir -p tmp/videos

Recording approach: Use browser screenshots as frames

agent-browser captures screenshots at key moments, then combine into video using ffmpeg:

ffmpeg -framerate 2 -pattern_type glob -i 'tmp/screenshots/*.png' -vf "scale=1280:-1" tmp/videos/feature-demo.gif

</setup_recording>

5. Record the Walkthrough

<record_walkthrough>

Execute the planned flow, capturing each step:

Step 1: Navigate to starting point

agent-browser open "[base-url]/[start-route]"
agent-browser wait 2000
agent-browser screenshot tmp/screenshots/01-start.png

Step 2: Perform navigation/interactions

agent-browser snapshot -i  # Get refs
agent-browser click @e1    # Click navigation element
agent-browser wait 1000
agent-browser screenshot tmp/screenshots/02-navigate.png

Step 3: Demonstrate feature

agent-browser snapshot -i  # Get refs for feature elements
agent-browser click @e2    # Click feature element
agent-browser wait 1000
agent-browser screenshot tmp/screenshots/03-feature.png

Step 4: Capture result

agent-browser wait 2000
agent-browser screenshot tmp/screenshots/04-result.png

Create video/GIF from screenshots:

# Create directories
mkdir -p tmp/videos tmp/screenshots

# Create MP4 video (RECOMMENDED - better quality, smaller size)
# -framerate 0.5 = 2 seconds per frame (slower playback)
# -framerate 1 = 1 second per frame
ffmpeg -y -framerate 0.5 -pattern_type glob -i 'tmp/screenshots/*.png' \
  -c:v libx264 -pix_fmt yuv420p -vf "scale=1280:-2" \
  tmp/videos/feature-demo.mp4

# Create low-quality GIF for preview (small file, for GitHub embed)
ffmpeg -y -framerate 0.5 -pattern_type glob -i 'tmp/screenshots/*.png' \
  -vf "scale=640:-1:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=128[p];[s1][p]paletteuse" \
  -loop 0 tmp/videos/feature-demo-preview.gif

Note:

• The -2 in MP4 scale ensures height is divisible by 2 (required for H.264)
• Preview GIF uses 640px width and 128 colors to keep file size small (~100-200KB)

</record_walkthrough>

6. Upload the Video

<upload_video>

Upload with rclone:

# Check rclone is configured
rclone listremotes

# Upload video, preview GIF, and screenshots to cloud storage
# Use --s3-no-check-bucket to avoid permission errors
rclone copy tmp/videos/ r2:kieran-claude/pr-videos/pr-[number]/ --s3-no-check-bucket --progress
rclone copy tmp/screenshots/ r2:kieran-claude/pr-videos/pr-[number]/screenshots/ --s3-no-check-bucket --progress

# List uploaded files
rclone ls r2:kieran-claude/pr-videos/pr-[number]/

Public URLs (R2 with public access):

Video: https://pub-4047722ebb1b4b09853f24d3b61467f1.r2.dev/pr-videos/pr-[number]/feature-demo.mp4
Preview: https://pub-4047722ebb1b4b09853f24d3b61467f1.r2.dev/pr-videos/pr-[number]/feature-demo-preview.gif

</upload_video>

7. Update PR Description

<update_pr>

Get current PR body:

gh pr view [number] --json body -q '.body'

Add video section to PR description:

If the PR already has a video section, replace it. Otherwise, append:

IMPORTANT: GitHub cannot embed external MP4s directly. Use a clickable GIF that links to the video:

## Demo

[![Feature Demo]([preview-gif-url])]([video-mp4-url])

*Click to view full video*

Example:

[![Feature Demo](https://pub-4047722ebb1b4b09853f24d3b61467f1.r2.dev/pr-videos/pr-137/feature-demo-preview.gif)](https://pub-4047722ebb1b4b09853f24d3b61467f1.r2.dev/pr-videos/pr-137/feature-demo.mp4)

Update the PR:

gh pr edit [number] --body "[updated body with video section]"

Or add as a comment if preferred:

gh pr comment [number] --body "## Feature Demo

![Demo]([video-url])

_Automated walkthrough of the changes in this PR_"

</update_pr>

8. Cleanup

<cleanup>

# Optional: Clean up screenshots
rm -rf tmp/screenshots

# Keep videos for reference
echo "Video retained at: tmp/videos/feature-demo.gif"

</cleanup>

9. Summary

<summary>

Present completion summary:

## Feature Video Complete

**PR:** #[number] - [title]
**Video:** [url or local path]
**Duration:** ~[X] seconds
**Format:** [GIF/MP4]

### Shots Captured
1. [Starting point] - [description]
2. [Navigation] - [description]
3. [Feature demo] - [description]
4. [Result] - [description]

### PR Updated
- [x] Video section added to PR description
- [ ] Ready for review

**Next steps:**
- Review the video to ensure it accurately demonstrates the feature
- Share with reviewers for context

</summary>

Quick Usage Examples

# Record video for current branch's PR
/feature-video

# Record video for specific PR
/feature-video 847

# Record with custom base URL
/feature-video 847 http://localhost:5000

# Record for staging environment
/feature-video current https://staging.example.com

Tips

• Keep it short: 10-30 seconds is ideal for PR demos
• Focus on the change: Don't include unrelated UI
• Show before/after: If fixing a bug, show the broken state first (if possible)
• Annotate if needed: Add text overlays for complex features