Initial skill: tiktok-video-review with 14-frame extraction workflow

SKILL.md

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+---
+name: tiktok-video-review
+description: Download a TikTok video, extract evenly distributed frames (default 14), and inspect content quickly.
+---
+
+# tiktok-video-review
+
+Use this skill when someone wants you to actually look inside a TikTok video instead of only reading metadata.
+
+## Goal
+
+Get a fast visual understanding of a TikTok by extracting evenly distributed frames across the full video.
+
+Default assumption:
+- `14` frames across the entire video.
+
+## Required tools
+
+- `yt-dlp`
+- `ffprobe`
+- `ffmpeg`
+
+If missing, install before proceeding.
+
+## Workflow
+
+1. Download the TikTok URL to a local mp4.
+2. Read duration with `ffprobe`.
+3. Extract `14` evenly spaced frames using the helper script.
+4. View the extracted frames and summarize what happens in the video.
+
+## Commands
+
+```bash
+# 1) Download
+yt-dlp -o /tmp/tiktok_review.mp4 "<tiktok-url>"
+
+# 2) Extract 14 frames across duration
+skills/tiktok-video-review/scripts/extract-frames.sh \
+  --input /tmp/tiktok_review.mp4 \
+  --outdir /tmp/tiktok_review_frames \
+  --count 14
+```
+
+## Notes
+
+- Keep frame extraction uniform across the timeline, not clustered at the start.
+- If the video is very short, still aim for the requested count and accept near-duplicate moments.
+- Always state clearly that the summary is based on sampled frames, not full per-frame playback.

_meta.json

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+{
+  "ownerId": "local",
+  "slug": "tiktok-video-review",
+  "version": "1.0.0"
+}

scripts/extract-frames.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+INPUT=""
+OUTDIR=""
+COUNT="14"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --input)
+      INPUT="$2"
+      shift 2
+      ;;
+    --outdir)
+      OUTDIR="$2"
+      shift 2
+      ;;
+    --count)
+      COUNT="$2"
+      shift 2
+      ;;
+    *)
+      echo "Unknown arg: $1" >&2
+      exit 1
+      ;;
+  esac
+done
+
+if [[ -z "$INPUT" || -z "$OUTDIR" ]]; then
+  echo "Usage: $0 --input <video.mp4> --outdir <dir> [--count 14]" >&2
+  exit 1
+fi
+
+if [[ ! -f "$INPUT" ]]; then
+  echo "Input file not found: $INPUT" >&2
+  exit 1
+fi
+
+mkdir -p "$OUTDIR"
+rm -f "$OUTDIR"/frame_*.jpg
+
+DURATION="$(ffprobe -v error -show_entries format=duration -of default=nokey=1:noprint_wrappers=1 "$INPUT")"
+
+python3 - "$INPUT" "$OUTDIR" "$COUNT" "$DURATION" <<'PY'
+import os
+import subprocess
+import sys
+
+inp, outdir, count_s, dur_s = sys.argv[1:]
+count = max(1, int(count_s))
+duration = float(dur_s)
+
+if duration <= 0:
+    print("Invalid duration", file=sys.stderr)
+    sys.exit(1)
+
+# Centered uniform sampling across full duration.
+step = duration / count
+times = [min(duration - 0.01, (i + 0.5) * step) for i in range(count)]
+
+for idx, t in enumerate(times, start=1):
+    out = os.path.join(outdir, f"frame_{idx:02d}.jpg")
+    cmd = [
+        "ffmpeg", "-y",
+        "-ss", f"{t:.6f}",
+        "-i", inp,
+        "-frames:v", "1",
+        "-q:v", "2",
+        out,
+    ]
+    subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+print(f"Extracted {count} frames to {outdir}")
+PY
+
+ls -1 "$OUTDIR"/frame_*.jpg