Subtitle Focus

Subtitle Focus｜字幕美化与重点烧录

Turn a reviewed, timestamped SRT into yellow semantic highlights, an approved short sample, and a traceable full-video burn-in. When the user provides a reference screenshot, additionally calibrate the caption style for that project. The agent decides what the words mean from SRT context, loaded glossaries, project evidence, and user corrections; the bundled script owns deterministic flags, exact replacement, source locking, mixed CJK/Latin layout, rendering, review frames, and hashes. Source SRT and video are read-only.

Require an exported SRT. A video-only input or a plain line-by-line MD transcript has no accepted timeline in this Skill. Stop and ask the user to export SRT; do not call Video Use, 剪口播, local Whisper, ASR, or OCR.

Work in five gates. Stop at each confirmation gate.

SRT 校对锁定 → 高亮确认 → 样片确认 → 全片抽帧 → 交付登记

Gate 1 — SRT 校对锁定

1. Run doctor before first use on a machine.
2. Require a timestamped SRT. Reject plain MD/transcript input and video-only transcription requests.
3. Ask for two explicit choices at project intake: use a personal glossary or explicitly skip it; use a project glossary or explicitly skip it. Do not ask during installation, and do not start formal proofreading until both choices are recorded by the proofread flags.
4. Run proofread. The base glossary loads automatically. Read text-lock-schema.md for the explicit choices, layering, privacy behavior, and schema. The public-source review policy is documented in glossary-sources.md.
5. Inspect every cue using SRT neighbors, loaded glossary provenance, project vocabulary, product names, project files, and user corrections. Only apply spelling, capitalization, number, unit, pronoun, or spacing rules when an actual user/project rule or enumerated glossary entry exists. Do not invent a general normalization policy.
6. Draft corrections.json. Glossary matches are suggestions, never automatic edits. Never rewrite silently.
7. Run correct; show the cue-level before/after table to the user. The output must preserve unmentioned line breaks and repeated spaces in the SRT text.
8. After explicit text approval, run lock --confirmed.

STOP. Do not plan highlights from an unlocked SRT. Any byte change to the SRT invalidates its lock, caption plan, sample, and full render. Regenerate them.

Gate 2 — 高亮文字

1. Run plan --lock ... with --max-chars 16 unless the user asks otherwise.
2. Draft highlight.json using highlight-schema.md.
3. Run apply and review. Adjust the choices until the cadence report passes, then run validate.
4. Send the user the complete caption manuscript in timeline order, with every proposed highlight marked directly in the sentence using Markdown bold. Do not send a separate keyword list or highlight table first. Ask the user to confirm the bold locations or name the sentences that need retargeting.

Selection: meaning-bearing complete words or phrases only. Treat each rendered caption segment as one sentence. Every adjacent pair must contain at least one highlighted segment, so a run of unhighlighted sentences can be at most one. A cue whose complete text is enclosed by matching Chinese or ASCII parentheses is an offscreen/PiP aside: keep it plain and treat it as a cadence boundary. Inline parentheses inside a normal sentence do not create this exemption. A user's explicit request to keep a specific cue or segment plain outranks cadence, especially for PiP/offscreen content: record it as a plain_overrides entry with the target id and the user-confirmed reason, keep it plain, and treat it as a cadence boundary even without parentheses. Do not invent this exemption merely because content seems secondary, and do not add a nearby filler highlight to compensate. Highlighting every sentence is allowed when it improves continuity. A short semantically atomic sentence may be highlighted in full; a longer sentence should normally keep one primary meaning-bearing phrase, or two only for a genuine parallel or contrast. Do not split a word, product name, or phrase merely to reduce a percentage. Do not highlight filler, transitions, or low-information words just to satisfy cadence. Coverage never blocks a plan. The review adds a non-blocking density warning when a longer segment is mostly highlighted or contains too many highlight ranges, and the user decides from the complete bolded manuscript. If cadence cannot be satisfied with a meaningful highlight or an explicit user exception, report the conflicting segment ids for user review. Never rewrite the locked SRT during highlighting.

STOP. Do not render until the user confirms the bolded complete manuscript.

Gate 3 — 样片与参考图样式

1. Copy default-style.json or derive a version with style.
2. Keep the default center_y_ratio at 0.82 when there is no reference demo.
3. When the user supplies a reference screenshot, inspect it and run style --reference-image ... with explicit overrides such as --center-y-ratio, --safe-width-ratio, or --font-size-max. The output records the reference image SHA and dimensions. See style-calibration.md.
4. Render a 10–15 second clip starting at the first highlight.
5. Run preview --video ... for CJK, Latin, and mixed highlights so stills use the target video's real dimensions.
6. Inspect baseline, overlap, clipping, phone-frame safe area, avatar avoidance, and reference-demo alignment.
7. Run validate --video ... --style ... to measure every caption with the actual video dimensions and selected font. The renderer may shrink a caption to font_size_min; a caption that still exceeds the safe pixel width fails.

STOP. Full render is forbidden until the user accepts the sample. Style changes create style-vN.json; text changes return to Gate 1.

Gate 4 — 全片与抽帧

1. Run render without --start or --duration.
2. Run validate --video ... against the locked SRT and final video duration.
3. Run frames against the final rendered video with --already-burned, passing --corrections whenever corrections exist. It must include every corrected cue, every highlighted segment, and entry/middle/exit frames.
4. Inspect contact-sheet.jpg plus each full-resolution frame. Corrected cues missing from review frames are a delivery failure.

Gate 5 — 唯一交付

Run deliver using the final video, locked SRT, highlighted plan, style, corrections, and review directory. The command writes one subtitle-focus-delivery manifest with paths, hashes, video metadata, changed cue ids, reviewed cue ids, reference-demo provenance, and handoff files.

Use --handoff-dir to copy the final SRT and generate a transcript. Add --copy-video only when the user wants the video copied. Add --publish-copy when a finished publishing document already exists. Never invent publishing copy.

See delivery-schema.md.

Command map

SCRIPT=skill/scripts/subtitle_focus.py

python3 "$SCRIPT" doctor
python3 "$SCRIPT" glossary-init --scope personal
python3 "$SCRIPT" proofread --srt /abs/in.srt --no-personal-glossary --no-project-glossary --output /abs/text-review.md
python3 "$SCRIPT" correct --srt /abs/in.srt --corrections /abs/corrections.json --output /abs/locked-text.srt --review /abs/corrections-review.md
python3 "$SCRIPT" lock --srt /abs/locked-text.srt --output /abs/srt-lock.json --confirmed
python3 "$SCRIPT" plan --srt /abs/locked-text.srt --lock /abs/srt-lock.json --output /abs/caption-plan.json
python3 "$SCRIPT" apply --plan /abs/caption-plan.json --highlights /abs/highlight.json --output /abs/caption-plan.highlighted.json
python3 "$SCRIPT" review --plan /abs/caption-plan.highlighted.json --output /abs/highlight-review.md
python3 "$SCRIPT" style --base skill/assets/default-style.json --reference-image /abs/demo.png --center-y-ratio 0.73 --output /abs/style-v1.json
python3 "$SCRIPT" validate --plan /abs/caption-plan.highlighted.json --video /abs/input.mp4 --style /abs/style-v1.json
python3 "$SCRIPT" preview --video /abs/input.mp4 --plan /abs/caption-plan.highlighted.json --style /abs/style-v1.json --cue 2 --output /abs/cue-2.png
python3 "$SCRIPT" render --video /abs/input.mp4 --plan /abs/caption-plan.highlighted.json --style /abs/style-v1.json --output /abs/edit/final-subtitled.mp4
python3 "$SCRIPT" frames --video /abs/edit/final-subtitled.mp4 --already-burned --plan /abs/caption-plan.highlighted.json --style /abs/style-v1.json --corrections /abs/corrections.json --output-dir /abs/edit/review-frames
python3 "$SCRIPT" deliver --video /abs/edit/final-subtitled.mp4 --srt /abs/locked-text.srt --plan /abs/caption-plan.highlighted.json --style /abs/style-v1.json --corrections /abs/corrections.json --review-dir /abs/edit/review-frames --output /abs/edit/delivery.json

Run python3 scripts/subtitle_focus.py <command> --help for all flags.

Drawing contract

Visual numbers and typography rules are in visual-spec.md. Do not add agent-side drawing hacks. Keep one shared baseline, enlarge only highlighted runs, keep mixed phrases such as C 组 together, and draw strings as whole runs.

Do not