YouTube Transcript Summarizer

Overview

The YouTube Transcript Summarizer is a CLI tool that extracts transcripts from YouTube videos and generates executive summaries in Spanish using Google's Generative AI (Gemini). This tool is designed for professionals who need concise, actionable insights from long videos without manually going through the entire content.

Features

• Extracts transcripts from YouTube videos automatically
• Summarizes transcripts using Gemini AI (Google Generative AI)
• Provides structured, professional markdown summaries
• Supports batch processing of multiple YouTube video URLs
• Ensures redundancy elimination and highlights key points
• Saves the generated summary as a markdown (.md) file

Prerequisites

Before using this tool, make sure you have the following installed:

• Bun runtime
• A valid Gemini API Key from Google

Installation

To install the required dependencies, run:

bun install

Usage

1. Set up the Gemini API Key

Ensure your API key is set in your environment variables:

export GEMINI_API_KEY=your_google_gemini_api_key

Alternatively, you can add it to your .env file:

GEMINI_API_KEY=your_google_gemini_api_key

2. Run the CLI Tool

Execute the script and input the YouTube video URLs when prompted:

bun run src/main.ts

You will be asked to enter one or multiple YouTube URLs separated by commas.

3. Output

After processing, the script generates a markdown file with the summary:

✅ Resumen guardado en resumen-[video_id]-[timestamp].md

The file contains:

• A descriptive title
• Key highlights formatted in bold
• Subheadings for better readability
• A markdown structure optimized for publishing

Code Breakdown

processVideo(url: string)

This function:

1. Extracts the video transcript using YoutubeTranscript.fetchTranscript(url)
2. Processes the text into a clean transcript array
3. Sends the processed transcript to Gemini AI for summarization
4. Saves the AI-generated summary as a markdown file

main()

• Asks the user for YouTube video URLs via inquirer
• Calls processVideo(url) for each provided URL

Dependencies

This project relies on the following libraries:

| Dependency | Version | Description | |------------|---------|-------------| | @google/generative-ai | ^0.21.0 | Google Generative AI SDK | | inquirer | ^12.4.2 | CLI prompt handler | | youtube-transcript | ^1.2.1 | Fetches YouTube transcripts | | @types/bun | latest | TypeScript definitions for Bun | | typescript | ^5.0.0 | TypeScript support |

Error Handling

The script includes basic error handling to:

• Validate the presence of GEMINI_API_KEY
• Check if the YouTube URL is valid
• Catch and log errors during transcript fetching and AI processing

Future Improvements

• Support for multiple languages beyond Spanish
• Improved error handling for missing transcripts
• Custom summary length options (short, medium, long)
• Integration with Google Drive or Notion for automatic storage
• Web-based interface for a more user-friendly experience

License

This project is licensed under the MIT License. Feel free to use, modify, and distribute it as needed.

Author

Developed by Roberto Ríos. Contributions and feedback are welcome!