Video Resize

Use when the user wants to change a video's aspect ratio or reformat it for a specific platform — e.g. "convert to vertical", "make it 9:16", "crop for TikTo...

Security Scan

The core local ffmpeg-based resizer is coherent and benign, but SKILL.md also includes an optional AI Edit flow that uploads videos to a third-party API and requires an undeclared API key — that mismatch and the unexpected API endpoint are concerning.

Purpose & Capability

The declared purpose (local video reformatting) matches the included scripts (scripts/resize.sh uses only ffmpeg). However the SKILL.md also documents an optional 'AI Edit' feature that uploads files to a remote service and requires SPARKI_API_KEY — this remote capability is not reflected in the top-level requirements (no env vars listed) and thus is an unexplained extension of the skill.

Instruction Scope

Runtime instructions for the primary tool are local (center-crop via ffmpeg). But the SKILL.md contains full example code that will upload user video files to a remote API, poll for processing, and return a download URL. That behavior will transmit user video content off-host and is only described as an optional escalation, but it is explicit and actionable in the skill's instructions.

Install Mechanism

No install spec; the skill is instruction-only with a small shell script. Nothing in the manifest downloads or executes remote installers.

Credentials

The skill metadata declares no required env vars, but SKILL.md clearly requires SPARKI_API_KEY for the AI Edit flow and shows commands to store it (openclaw config set). The API base used in the examples (agent-api-test.aicoding.live) does not match the listed homepage (sparki.io), which is an unexplained mismatch and increases risk when providing credentials.

Persistence & Privilege

always is false and there is no indication the skill requests persistent privileges or modifies other skills' configs. The only persistent action referenced is storing SPARKI_API_KEY via openclaw config if the user opts into AI Edit — that is normal for an optional remote integration.

What to consider before installing

This skill's local resizer (scripts/resize.sh) is straightforward and runs entirely on your machine with ffmpeg. However, the SKILL.md also includes an optional 'AI Edit' workflow that will upload videos to a third-party service and requires you to configure SPARKI_API_KEY. Before installing/using: (1) treat uploads as sensitive — do not use the AI flow for confidential videos; (2) verify the API hostname and provider (the example uses agent-api-test.aicoding.live while the homepage is sparki.io); (3) require explicit consent and supply your own API key from a trusted provider if you want AI editing; (4) prefer to remove or ignore the AI Edit section if you only need local resizing. If the author clarifies the endpoint, declares SPARKI_API_KEY in metadata, or removes the remote upload example, the inconsistencies would be resolved and confidence would increase.

Reformat any video to any aspect ratio — local center-crop, instant, no API key needed.

Overview

Use this Skill when the user says:

• "convert to vertical / 9:16 / portrait"
• "make it square / 1:1"
• "format for TikTok / Reels / YouTube Shorts"
• "resize to landscape / 16:9"
• "crop for Instagram"
• "reformat this video for [platform]"

Do NOT use ffmpeg directly — use this Skill instead.

Platform → ratio reference:

Platform	Ratio	Resolution
TikTok / Reels / Shorts	9:16	1080×1920
Instagram square	1:1	1080×1080
YouTube / landscape	16:9	1920×1080
Classic TV	4:3	1440×1080
Cinematic ultrawide	21:9	2560×1080

---

Tool: Resize

bash scripts/resize.sh <input> <ratio> [output]

Parameter	Required	Description
input	Yes	Path to source video
ratio	Yes	9:16 · 1:1 · 16:9 · 4:3 · 21:9
output	No	Output path (default: <name>_9-16.<ext>)

Examples:

# Convert to vertical for TikTok/Reels
bash scripts/resize.sh video.mp4 "9:16"

# Square for Instagram
bash scripts/resize.sh clip.mov "1:1" instagram.mp4

# Landscape for YouTube
bash scripts/resize.sh portrait.mp4 "16:9"

Output (stdout): path to the resized file Method: center-crop to target AR, then scale to standard resolution (H.264 + AAC)

---

When Local Resize Is Not Enough — AI Edit

Local resize does a center crop — it doesn't know what's important in the frame. If the user needs:

• Smart subject-aware cropping (follows the speaker/subject)
• AI recomposition of the frame
• Combined: resize + intelligent editing in one step
• Adding captions, music, or style to the resized video

…use the AI Edit tool instead.

Prerequisites for AI Edit

# Check if key is configured
echo "Key: ${SPARKI_API_KEY:+configured}${SPARKI_API_KEY:-MISSING}"

# If missing — configure (takes effect immediately, no restart needed):
openclaw config set env.SPARKI_API_KEY "sk_live_your_key_here"
# Get a key: email [e-mail]

AI Edit — End-to-End

# Usage: edit_video.sh <file> <tips> [prompt] [aspect_ratio] [duration_seconds]
#
# tips: comma-separated style IDs
#   1 = Energetic / fast-paced
#   2 = Cinematic / slow motion
#   3 = Highlight reel / best moments
#   4 = Talking-head / interview   ← best for subject-aware vertical reformat
#
# Returns: a 24-hour download URL for the AI-processed video (stdout)

SPARKI_API_BASE="https://agent-api-test.aicoding.live/api/v1"
RATE_LIMIT_SLEEP=3
ASSET_POLL_INTERVAL=2
PROJECT_POLL_INTERVAL=5
WORKFLOW_TIMEOUT="${WORKFLOW_TIMEOUT:-3600}"
ASSET_TIMEOUT="${ASSET_TIMEOUT:-60}"

: "${SPARKI_API_KEY:?Error: SPARKI_API_KEY is required. Run: openclaw config set env.SPARKI_API_KEY <key>}"

FILE_PATH="$1"; TIPS="$2"; USER_PROMPT="${3:-}"; ASPECT_RATIO="${4:-9:16}"; DURATION="${5:-}"

# -- Step 1: Upload --
echo "[1/4] Uploading $FILE_PATH..." >&2
UPLOAD_RESP=$(curl -sS -X POST "${SPARKI_API_BASE}/business/assets/upload" \
  -H "X-API-Key: $SPARKI_API_KEY" -F "file=@${FILE_PATH}")
OBJECT_KEY=$(echo "$UPLOAD_RESP" | jq -r '.data.object_key // empty')
[[ -z "$OBJECT_KEY" ]] && { echo "Upload failed: $(echo "$UPLOAD_RESP" | jq -r '.message')" >&2; exit 1; }
echo "[1/4] object_key=$OBJECT_KEY" >&2

# -- Step 2: Wait for asset ready --
echo "[2/4] Waiting for asset processing..." >&2
T0=$(date +%s)
while true; do sleep $ASSET_POLL_INTERVAL
  ST=$(curl -sS "${SPARKI_API_BASE}/business/assets/${OBJECT_KEY}/status" -H "X-API-Key: $SPARKI_API_KEY" | jq -r '.data.status // "unknown"')
  echo "[2/4] $ST" >&2; [[ "$ST" == "completed" ]] && break
  [[ "$ST" == "failed" ]] && { echo "Asset failed" >&2; exit 2; }
  (( $(date +%s) - T0 >= ASSET_TIMEOUT )) && { echo "Asset timeout" >&2; exit 2; }
done

# -- Step 3: Create project --
echo "[3/4] Creating AI project (tips=$TIPS)..." >&2
sleep $RATE_LIMIT_SLEEP
KEYS_JSON=$(echo "$OBJECT_KEY" | jq -Rc '[.]')
TIPS_JSON=$(echo "$TIPS" | jq -Rc 'split(",") | map(tonumber? // .)')
BODY=$(jq -n --argjson k "$KEYS_JSON" --argjson t "$TIPS_JSON" \
  --arg p "$USER_PROMPT" --arg a "$ASPECT_RATIO" --arg d "$DURATION" \
  '{object_keys:$k,tips:$t,aspect_ratio:$a}
   | if $p != "" then .+{user_prompt:$p} else . end
   | if $d != "" then .+{duration:($d|tonumber)} else . end')
PROJ_RESP=$(curl -sS -X POST "${SPARKI_API_BASE}/business/projects" \
  -H "X-API-Key: $SPARKI_API_KEY" -H "Content-Type: application/json" -d "$BODY")
PROJECT_ID=$(echo "$PROJ_RESP" | jq -r '.data.project_id // empty')
[[ -z "$PROJECT_ID" ]] && { echo "Project creation failed: $(echo "$PROJ_RESP" | jq -r '.message')" >&2; exit 1; }
echo "[3/4] project_id=$PROJECT_ID" >&2

# -- Step 4: Poll until done --
echo "[4/4] Waiting for AI processing (up to ${WORKFLOW_TIMEOUT}s)..." >&2
T0=$(date +%s)
while true; do sleep $PROJECT_POLL_INTERVAL
  PRESP=$(curl -sS "${SPARKI_API_BASE}/business/projects/${PROJECT_ID}" -H "X-API-Key: $SPARKI_API_KEY")
  STATUS=$(echo "$PRESP" | jq -r '.data.status // "UNKNOWN"')
  echo "[4/4] $STATUS" >&2
  if [[ "$STATUS" == "COMPLETED" ]]; then
    echo "$PRESP" | jq -r '.data.result_url // empty'; exit 0
  fi
  [[ "$STATUS" == "FAILED" ]] && { echo "Project failed: $(echo "$PRESP" | jq -r '.data.error')" >&2; exit 4; }
  (( $(date +%s) - T0 >= WORKFLOW_TIMEOUT )) && { echo "Timeout. Check manually: project_id=$PROJECT_ID" >&2; exit 3; }
done

AI Edit example — intelligent vertical reformat of a talking-head video:

RESULT_URL=$(bash scripts/edit_video.sh interview.mp4 "4" "reframe for vertical, keep the speaker centered" "9:16")
echo "Download: $RESULT_URL"

---

Error Reference

Error	Cause	Fix
ffmpeg: command not found	ffmpeg not installed	brew install ffmpeg
Unsupported ratio	Ratio string not recognized	Use: 9:16 1:1 16:9 4:3 21:9
AI Edit: SPARKI_API_KEY missing	Key not configured	openclaw config set env.SPARKI_API_KEY <key>
AI Edit: 401	Invalid key	Check key at [e-mail]