youtube-transcriber

One-command YouTube video transcription. Automatically downloads audio and transcribes using OpenAI Whisper API — works even when YouTube subtitles are disabled. Use when asked to "transcribe this video", "get transcript", "what does this video say", or when YouTube captions are unavailable.

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Install skill "youtube-transcriber" with this command: npx skills add edisonchenai/youtube-transcriber

YouTube Transcriber

One-command transcription for any YouTube video — even when subtitles are disabled.

How it works:

  1. Tries to fetch existing YouTube subtitles first (free, instant)
  2. If subtitles are disabled/unavailable → downloads audio → transcribes via OpenAI Whisper API

Prerequisites

  • yt-dlp — brew install yt-dlp or pip install yt-dlp
  • ffmpeg — brew install ffmpeg
  • OPENAI_API_KEY environment variable set

Usage

# Basic — auto-detect best method
{baseDir}/scripts/transcribe.sh "https://www.youtube.com/watch?v=VIDEO_ID"

# Specify language (improves accuracy for non-English)
{baseDir}/scripts/transcribe.sh "https://www.youtube.com/watch?v=VIDEO_ID" --lang zh

# Custom output path
{baseDir}/scripts/transcribe.sh "https://www.youtube.com/watch?v=VIDEO_ID" --out /tmp/transcript.txt

# Force Whisper (skip subtitle check)
{baseDir}/scripts/transcribe.sh "https://www.youtube.com/watch?v=VIDEO_ID" --force-whisper

# Keep downloaded audio file
{baseDir}/scripts/transcribe.sh "https://www.youtube.com/watch?v=VIDEO_ID" --keep-audio

Options

OptionDescriptionDefault
--lang <code>Language hint (ISO 639-1: en, zh, ja, ko, etc.)auto-detect
--out <path>Output transcript file path/tmp/yt_transcript_<VIDEO_ID>.txt
--force-whisperSkip subtitle check, always use Whisper APIoff
--keep-audioKeep the downloaded audio file after transcriptionoff (deletes audio)
--audio-bitrate <kbps>Audio compression bitrate64

How It Works

YouTube URL
    │
    ├─► Try yt-dlp subtitles (free, instant)
    │       │
    │       ├─ Found → Clean & output transcript ✓
    │       │
    │       └─ Not found / disabled
    │               │
    │               ▼
    └─► Download audio (yt-dlp + ffmpeg)
            │
            ├─ Compress to mono, low bitrate (fit 25MB API limit)
            │
            ▼
        OpenAI Whisper API → transcript ✓

Cost

  • With subtitles available: Free (uses existing captions)
  • Whisper API: ~$0.006/minute of audio → 23-min video ≈ $0.14

Supported

  • Any YouTube video URL (full URL, youtu.be short link, or video ID)
  • All languages supported by Whisper (99+ languages)
  • Videos up to ~4 hours (audio compressed to fit 25MB API limit)

Troubleshooting

  • 403 from YouTube: Update yt-dlp (pip install -U yt-dlp)
  • File too large for Whisper: Lower bitrate with --audio-bitrate 32
  • Missing API key: Set OPENAI_API_KEY environment variable

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