Show HN: ObsidianYouTubeSync – Sync YouTube History into Obsidian (github.com)

ObsidianYouTubeSync has emerged as a powerful tool designed to transform your YouTube watch history into a structured, AI-tagged knowledge graph compatible with Obsidian and other knowledge management systems. The software automates a comprehensive process that includes downloading video metadata, extracting captions and transcripts, generating concise summaries via Google Gemini LLM, and saving each video as a richly categorized Markdown note. This tool addresses the challenge of making sense of extensive YouTube libraries, enabling users to cultivate their viewing history into an organized, searchable dataset. The significance of ObsidianYouTubeSync lies in its ability to enhance personal knowledge management (PKM) for individuals with large watch histories. Its automated classification system employs hierarchical AI taxonomy tags to categorize content, while its integration with tools like GraphRAG and OpenClaw facilitates advanced applications such as knowledge graph construction and AI training. Key features include incremental updates, parallel processing for swift data handling, and local-first execution that ensures user data privacy—all designed to revolutionize how video content is interacted with and transformed into actionable intelligence.