YouTube Video Summarizer

A Python tool that fetches YouTube video transcripts and uses Google's Gemini 2.5 Pro (via LangChain) to generate a short summary paragraph.

Features

• Smart Summarization: Uses gemini-2.5-pro for high-quality summaries.
• Transcript Fetching: robustly handles video URLs and IDs.
• Secure Authentication:
  • Supports .env file for GOOGLE_API_KEY.
  • Interactively prompts for the key if missing (no hardcoding!).
• Modern Tooling: Managed by uv for fast dependency resolution.

Installation

1. Clone the repository:

   git clone <repository_url>
   cd YouTube-Video-Summarizer

2. Install dependencies:

   uv sync
   # or
   uv pip install -r pyproject.toml

Usage

1. Set your API Key (Optional but recommended): Create a .env file in the root directory:

   GOOGLE_API_KEY=your_actual_api_key_here

2. Run the interactive tool:

   uv run main.py

3. Interact:

   • Paste the YouTube URL when prompted.
   • View the summary.
   • Ask follow-up questions in the chat interface.
   • See "Suggested Questions" to explore the video further.

   Type exit or quit to end the session.

Web Interface (Streamlit)

For a visual interface with persistent history:

uv run streamlit run app.py

• Library Sidebar: Access past video chats.
• Rich Chat: Chat bubble interface.
• Persistence: automatically saves chat history to a local SQLite database.

Features

• Smart Summarization: Uses gemini-2.5-pro for high-quality summaries.
• Web GUI: Full-featured web chat with history sidebar.
• Interactive TUI: Beautiful terminal interface.
• Persistent Memory: Remembers your chats per video in chat_history.db.
• Auto-Suggestions: Get 3 relevant follow-up questions after every answer.
• Transcript Fetching: robustly handles video URLs and IDs.
• Secure Authentication: Supports .env and secure prompts.