视频转文字/视频总结/转文字/视频蒸馏/AI总结

Transcribe a local video file or online video URL (Bilibili / YouTube, etc.) into a structured Markdown document with keyframe screenshots, full audio transcription (ASR), on-screen text extraction (OCR), semantic segmentation, enhanced code blocks, and a summary. Use when the user asks to "转录视频 / 把这个视频转成文字 / 视频全文转录 / 提取视频中的文字和图片 / 把这节课做成文档" or wants a tutorial / course / talk video turned into readable, searchable Markdown. Body text follows a refined note style (chapter overview + step-wise concise narration, NOT verbatim ASR transcription); the author's original code is preserved verbatim with any optimization suggestions as separate comments. Includes a fully offline fallback stack (imageio-ffmpeg + faster-whisper + rapidocr-onnxruntime) for environments with no ffmpeg, no cloud ASR key, and no vision model. NOT for real-time livestream transcription, subtitle translation, or generating videos.

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