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+# Video Note Extractor — Design Spec
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+
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+## Purpose
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+
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+Extract timed text transcripts and single-frame screenshots from tutorial video
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+directories, for use in AI-assisted markdown note writing. Targeted at STM32 /
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+embedded tutorial collections, but intentionally collection-agnostic.
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+
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+## Commands
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+
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+### `parse` — Extract timed text from subtitle files
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+
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+```
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+python tools/extract.py parse <input> [--outdir <dir>]
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+```
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+
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+- **input**: path to a single `.mp4` file, or a **directory** containing `.mp4`
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+ files (scans recursively).
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+- **outdir**: output root. Default `./transcripts/`.
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+
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+**Output structure** (mirrors input directory layout):
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+
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+```
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+<outdir>/
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+└── transcripts/
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+ └── <collection-name>/
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+ └── <video-name>.txt
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+```
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+
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+Each `.txt` file contains lines of:
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+
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+```
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+[HH:MM:SS.mmm] <subtitle text>
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+```
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+
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+### `frame` — Extract a single frame as JPEG
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+
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+```
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+python tools/extract.py frame <video> <timestamp> --outpath <path>
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+```
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+
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+- **video**: path to `.mp4` file.
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+- **timestamp**: `HH:MM:SS` or `SSS` (seconds).
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+- **outpath**: where to write the JPEG image (parent directory created
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+ automatically).
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+
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+## Subtitle resolution priority
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+
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+For each `.mp4`, find the best-matching subtitle file:
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+
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+1. Same basename + `.srt`, excluding `_英文.srt` / `_English.srt`.
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+2. Same basename + `.ass` (parse `[Events]` → `Dialogue` lines, strip ASS
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+ override tags like `{\\fn...}`).
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+3. Neither → print warning, skip.
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+
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+## Dependencies
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+
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+- Python ≥ 3.10 (stdlib only for `parse`)
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+- `ffmpeg` / `ffprobe` on PATH (only for `frame`)
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+
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+## Anti-goals (explicitly out of scope)
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+
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+- No VAD / Silero / ONNX integration.
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+- No ASR / API calls.
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+- No batch screenshot extraction.
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+- No markdown generation — the output `.txt` files are consumed by a human or
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+ AI note-writer.
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+
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+## Usage flow (intended)
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+
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+1. `python tools/extract.py parse <collection-dir> --outdir ./transcripts`
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+2. Read `.txt` files → decide which timestamps need screenshots.
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+3. `python tools/extract.py frame <video> <ts> --outpath <notes>/assets/<name>.jpg`
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+4. Write markdown notes, embedding relevant screenshots.
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