long video + SRT
   ↓     (agent reads SRT, decides topics — judgment, not parsing)
segments.json
   ↓     segment.py --reencode (accurate seek; clip starts exactly at requested t)
clip_NN.mp4 + frame_NN.jpg
   ↓     ASK: target platform orientation match source?
   ↓     /wjs-reframing-video on each clip (if 16:9 → 9:16, etc.)
   ↓     re-extract frames from cropped clips
clip_NN.mp4 (now in target orientation) + clip_NN.zh-CN.burn.srt
   ↓
HAND OFF → /wjs-overlaying-video
   (does covers + captions + illustrations + CTA + final render)

{
  "source_video": "input.mp4",
  "source_srt": "input.zh-CN.srt",
  "platform": "wechat_channels",
  "segments": [{
    "id": 1, "slug": "intent-not-code",
    "title": "AI 时代不是写代码\n而是写意图",
    "summary": "Two-sentence pitch — what's the insight, what's at stake.",
    "start": "00:00:43.460", "end": "00:02:35.220",
    "cover_prompt": "Visual concept for gpt-image-2 (style anchor, not literal scene)"
  }]
}

python3 ~/.claude/skills/wjs-segmenting-video/scripts/segment.py \
    --segments segments.json --out output/ --reencode

undefined

Use this only when iterating on segment boundaries (you'll re-cut the
same source many times). For one-shot work, `--reencode` is simpler
and just as correct.

ffprobe -v error -select_streams v:0 -read_intervals "$((N-2))%$((N+5))" \
  -show_entries packet=pts_time,flags -of csv=p=0 master.mp4 | grep "K_"

ffprobe -v error -select_streams v:0 \
  -show_entries stream=width,height -of csv=p=0 clip_01_*.mp4

uv venv --python 3.12 /tmp/_crop_venv
/tmp/_crop_venv/bin/python -m pip install mediapipe opencv-python numpy

for n in 01 02 03 04 05; do
  slug=$(ls clip_${n}_*.mp4 | grep -v -E "_intro|_burned|_vert" | head -1 | sed -E "s/clip_${n}_(.+)\.mp4/\1/")
  /tmp/_crop_venv/bin/python ~/.claude/skills/wjs-reframing-video/scripts/crop.py \
    "clip_${n}_${slug}.mp4" \
    --out "clip_${n}_${slug}_vert.mp4" \
    --target portrait \
    --bitrate 8M    # 视频号 caps at 10Mbps
done

mkdir -p _horizontal_archive
for n in 01 02 03 04 05; do
  base=$(ls clip_${n}_*_vert.mp4 | sed -E "s/_vert\.mp4$//")
  mv "${base}.mp4" "_horizontal_archive/"
  mv "${base}_vert.mp4" "${base}.mp4"
  # Re-extract midpoint frame:
  mid=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "${base}.mp4" | awk '{print $1/2}')
  slug=$(echo "$base" | sed -E "s/^clip_${n}_//")
  ffmpeg -hide_banner -loglevel error -ss "$mid" -i "${base}.mp4" \
    -frames:v 1 -q:v 3 "frame_${n}_${slug}.jpg" -y
done

python3 ~/.claude/skills/wjs-segmenting-video/scripts/burn_subs.py \
    --segments segments.json --out output/ --no-burn

output/
  clip_NN_slug.mp4                  # raw cropped clip (target orientation, no subs, no cover)
  clip_NN_slug.zh-CN.burn.srt       # per-clip SRT, timestamps shifted to start at 0
  frame_NN_slug.jpg                 # midpoint frame (cover reference)
  segments.json                     # for slug/title/summary/cover_prompt metadata