Douyin watermark-free video downloader with automatic speech-to-text transcription and file export.

• Parses Douyin share links to extract direct download URLs for watermark-free videos without requiring API keys
• Downloads videos locally and extracts speech content via SiliconFlow's SenseVoice API, automatically saving transcripts as Markdown files organized by video ID
• Supports three action modes: info retrieval, video download, and text extraction with optional concurrent video saving
• Requires FFmpeg for audio/video processing and SiliconFlow API key only for transcription; includes quiet mode and Python library integration for programmatic use