YouTube Summarizer

Prerequisites

• yt-dlp must be installed (pip install yt-dlp)

Workflow

1. Extract transcript

Run the bundled script to fetch and clean the transcript:

python scripts/fetch_transcript.py "<YOUTUBE_URL>" --lang <LANG> 2>/tmp/yt_meta.json > /tmp/yt_transcript.txt

• --lang ja (default) for Japanese videos, --lang en for English.
• The script auto-detects original-language captions first, then falls back.
• stdout: cleaned plain-text transcript.
• stderr: JSON metadata {"video_id", "title", "language"}.
• If no subtitles exist, the script exits with code 1.

2. Read transcript and metadata

Read /tmp/yt_meta.json for the title and language, then read /tmp/yt_transcript.txt for the full text.

3. Summarize

Produce a structured summary in the user's language. Use the following structure as a guide (adapt headings to fit the content):

• Title / topic (one line)
• Core concept (1-2 paragraphs explaining the main idea)
• Key sections (3-5 sections with subheadings, covering the major points)
• Conclusion / takeaway

Keep the summary concise but comprehensive. Preserve technical terms and proper nouns from the original.

4. Clean up

Remove temporary files after summarization:

rm -f /tmp/yt_transcript.txt /tmp/yt_meta.json