readvideo 0.1.0

A Python tool for downloading and transcribing videos from YouTube/Bilibili and local media files

ReadVideo

A modern Python-based video and audio transcription tool that extracts and transcribes content from YouTube, Bilibili, and local media files. This project is a complete rewrite of the original bash script with improved modularity, performance, and user experience.

🚀 Features

Multi-Platform Support

• YouTube: Prioritizes existing subtitles, falls back to audio transcription
• Bilibili: Automatically downloads and transcribes audio using BBDown
• Local Files: Supports various audio and video file formats

Intelligent Processing

• Subtitle Priority: YouTube videos prioritize youtube-transcript-api for existing subtitles
• Multi-Language Support: Supports Chinese, English, and more with auto-detection or manual specification
• Fallback Mechanism: Automatically falls back to audio transcription when subtitles are unavailable

High Performance

• Tool Reuse: Directly calls installed whisper-cli for native performance
• Model Reuse: Utilizes existing models in ~/.whisper-models/ directory
• Efficient Processing: Smart temporary file management and cleanup

📦 Installation

Prerequisites

• Python 3.11+
• ffmpeg (system installation)
• whisper-cli (from whisper.cpp)
• yt-dlp (Python package, included)
• BBDown (optional, for Bilibili support)

Install with uv

# Install dependencies
uv sync

# Or install the package directly
uv pip install -e .

System Dependencies

# macOS
brew install ffmpeg whisper-cpp

# Ubuntu/Debian
sudo apt install ffmpeg
# Install whisper.cpp from source: https://github.com/ggerganov/whisper.cpp

# Download Whisper model (if not already present)
mkdir -p ~/.whisper-models
# Download ggml-large-v3.bin to ~/.whisper-models/

🎯 Quick Start

Basic Usage

# YouTube video (prioritizes subtitles)
readvideo https://www.youtube.com/watch?v=abc123

# Auto language detection
readvideo --auto-detect https://www.youtube.com/watch?v=abc123

# Bilibili video
readvideo https://www.bilibili.com/video/BV1234567890

# Local audio file
readvideo ~/Music/podcast.mp3

# Local video file
readvideo ~/Videos/lecture.mp4

# Custom output directory
readvideo input.mp4 --output-dir ./transcripts

# Show information only
readvideo input.mp4 --info-only

Command Line Options

Options:
  --auto-detect              Enable automatic language detection (default: Chinese)
  --output-dir, -o PATH      Output directory (default: current directory or input file directory)
  --no-cleanup               Do not clean up temporary files
  --info-only                Show input information only, do not process
  --whisper-model PATH       Path to Whisper model file [default: ~/.whisper-models/ggml-large-v3.bin]
  --verbose, -v              Verbose output
  --proxy TEXT               HTTP proxy address (e.g., http://127.0.0.1:8080)
  --help                     Show this message and exit

🏗️ Architecture

Project Structure

readvideo/
├── pyproject.toml              # Project configuration
├── README.md                   # Project documentation
└── src/readvideo/
    ├── __init__.py             # Package initialization
    ├── cli.py                  # CLI entry point
    ├── core/                   # Core functionality modules
    │   ├── transcript_fetcher.py   # YouTube subtitle fetcher
    │   ├── whisper_wrapper.py      # whisper-cli wrapper
    │   └── audio_processor.py      # Audio processor
    └── platforms/              # Platform handlers
        ├── youtube.py          # YouTube handler
        ├── bilibili.py         # Bilibili handler
        └── local.py            # Local file handler

Core Dependencies

• youtube-transcript-api: YouTube subtitle extraction
• yt-dlp: YouTube video downloading
• click: Command-line interface
• rich: Beautiful console output
• tenacity: Retry mechanisms
• ffmpeg: Audio processing (system dependency)
• whisper-cli: Speech transcription (system dependency)

🔧 How It Works

YouTube Processing

1. Subtitle Priority: Attempts to fetch existing subtitles using youtube-transcript-api
2. Language Preference: Prioritizes Chinese (zh, zh-Hans, zh-Hant), then English
3. Fallback: If no subtitles available, downloads audio with yt-dlp
4. Transcription: Converts audio to WAV and transcribes with whisper-cli

Bilibili Processing

1. Audio Download: Uses BBDown to extract audio from Bilibili videos
2. Format Conversion: Converts audio to WAV format using ffmpeg
3. Transcription: Processes audio with whisper-cli

Local File Processing

1. Format Detection: Automatically detects audio vs video files
2. Audio Extraction: Extracts audio tracks from video files using ffmpeg
3. Format Conversion: Converts to whisper-compatible WAV format
4. Transcription: Processes with whisper-cli

📋 Supported Formats

Audio Formats

• MP3, M4A, WAV, FLAC, OGG, AAC, WMA

Video Formats

• MP4, MKV, AVI, MOV, WMV, FLV, WEBM, M4V

🛠️ Configuration

Whisper Model Configuration

# Default model path
~/.whisper-models/ggml-large-v3.bin

# Custom model
readvideo input.mp4 --whisper-model /path/to/model.bin

Language Options

• --auto-detect: Automatic language detection
• Default: Chinese (zh)
• YouTube subtitles support multi-language priority

🧪 Testing

Test Examples

# YouTube video with subtitles
readvideo "https://www.youtube.com/watch?v=JdKVJH3xmlU" --info-only

# Bilibili video
readvideo "https://www.bilibili.com/video/BV1Tjt9zJEdw" --info-only

# Test local file format support
echo "test" > test.txt
readvideo test.txt --info-only  # Should show format error

Debugging

# Verbose output
readvideo input.mp4 --verbose

# Keep temporary files
readvideo input.mp4 --no-cleanup --verbose

# Information only (no processing)
readvideo input.mp4 --info-only

⚡ Performance

Speed Comparison

Operation	Time	Notes
YouTube subtitle fetch	~3-5s	When subtitles available
YouTube audio download	~30s-2min	Depends on video length
Audio conversion	~5-15s	Depends on file size
Whisper transcription	~0.1-0.5x video length	Depends on model and audio length

Performance Features

• Subtitle Priority: 10-100x faster than audio transcription for YouTube
• Native Tools: Direct whisper-cli calls maintain original performance
• Smart Caching: Reuses existing models and temporary files efficiently

🚨 Troubleshooting

Common Issues

1. whisper-cli not found

# Solution: Install whisper.cpp
brew install whisper-cpp  # macOS
# Or compile from source: https://github.com/ggerganov/whisper.cpp

2. ffmpeg not found

# Solution: Install ffmpeg
brew install ffmpeg      # macOS
sudo apt install ffmpeg  # Ubuntu/Debian

3. Model file missing

# Solution: Download whisper model
mkdir -p ~/.whisper-models
# Download ggml-large-v3.bin from whisper.cpp releases

4. YouTube IP restrictions

• The tool automatically falls back to audio download when subtitle API is blocked
• Consider using a proxy with --proxy option if needed
• Wait some time and retry

5. BBDown not found (Bilibili only)

• Download from BBDown GitHub
• Ensure it's in your PATH

Error Handling

• Graceful Fallbacks: YouTube subtitle failures automatically retry with audio transcription
• Intelligent Retries: Network issues are retried automatically, but IP blocks are not
• Clear Error Messages: Descriptive error messages with suggested solutions
• Cleanup on Failure: Temporary files are cleaned up even if processing fails

🔒 Security Notes

Cookie Usage

• Browser cookies are used only for video downloads (yt-dlp), not for subtitle API calls
• This follows security recommendations from the youtube-transcript-api maintainer
• Cookies help bypass some YouTube download restrictions

Privacy

• No data is sent to external services except for downloading content
• All processing happens locally on your machine
• Temporary files are automatically cleaned up

🤝 Contributing

This project replaces a bash script with a modern Python implementation. Key design principles:

1. Maintain Compatibility: Same functionality as the original bash script
2. Improve Performance: Leverage existing tools efficiently
3. Better UX: Rich console output and clear error messages
4. Extensible: Modular design for easy platform additions

Adding New Platforms

1. Create a new handler in platforms/
2. Implement validate_url(), process(), and get_info() methods
3. Add detection logic in CLI

Adding New Formats

1. Update format lists in AudioProcessor
2. Add corresponding ffmpeg parameters
3. Test with sample files

📄 License

This project maintains compatibility with the original bash script while providing a modern Python implementation focused on performance, reliability, and user experience.

🙏 Acknowledgments

• whisper.cpp for high-performance speech recognition
• yt-dlp for robust video downloading
• youtube-transcript-api for subtitle extraction
• BBDown for Bilibili support