Video Reverse Prompt

Analyze videos to extract detailed shot breakdowns and AI-ready prompts via the NanoPhoto.AI API.

Use the bundled script for local file uploads instead of inlining large base64 payloads directly in the shell; it is more reliable for multi-megabyte videos.

Prerequisites

1. Obtain an API key at: https://nanophoto.ai/settings/apikeys
2. Configure NANOPHOTO_API_KEY before using the skill.

Preferred OpenClaw setup:

• Open the skill settings for this skill
• Add an environment variable named NANOPHOTO_API_KEY
• Paste the API key as its value

Equivalent config shape:

{
  "skills": {
    "entries": {
      "video-reverse-prompt": {
        "enabled": true,
        "env": {
          "NANOPHOTO_API_KEY": "your_api_key_here"
        }
      }
    }
  }
}

Other valid ways to provide the key:

• Shell: export NANOPHOTO_API_KEY="your_api_key_here"
• Tool-specific env config: any runtime that injects NANOPHOTO_API_KEY

Credential declaration summary:

• Required env var: NANOPHOTO_API_KEY
• Primary credential: NANOPHOTO_API_KEY
• No unrelated credentials are required

If the env var is not set, ask the user to configure it before proceeding.

Workflow

1. Collect the video source from the user (YouTube link, direct .mp4 URL, or local file path)
2. Determine videoSource type: youtube, url, or file
3. Confirm the user is authorized to upload or process the content
4. If local file: read and base64-encode it (must be .mp4, max 30 MB)
5. Call the API (streaming response)
6. Return the shot breakdown and prompts to the user

API Call

YouTube Video

curl -X POST "https://nanophoto.ai/api/sora-2/reverse-prompt" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $NANOPHOTO_API_KEY" \
  --data-raw '{
    "videoSource": "youtube",
    "locale": "en",
    "videoUrl": "https://www.youtube.com/watch?v=XXXXXXXXXXX"
  }'

Direct Video URL

curl -X POST "https://nanophoto.ai/api/sora-2/reverse-prompt" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $NANOPHOTO_API_KEY" \
  --data-raw '{
    "videoSource": "url",
    "locale": "en",
    "videoUrl": "https://example.com/video.mp4"
  }'

Local File (Preferred: bundled script)

python3 scripts/reverse_prompt_file.py your-video.mp4 --locale en

The script reads NANOPHOTO_API_KEY from the environment, validates the file size/format, base64-encodes the MP4, and prints the streaming text response.

Local File (Manual Base64 request)

VIDEO_BASE64=$(base64 < your-video.mp4)

curl -X POST "https://nanophoto.ai/api/sora-2/reverse-prompt" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $NANOPHOTO_API_KEY" \
  --data-raw "{
    \"videoSource\": \"file\",
    \"locale\": \"en\",
    \"videoFile\": \"$VIDEO_BASE64\",
    \"videoFileName\": \"your-video.mp4\"
  }"

Parameters

Constraints

• Only .mp4 format supported
• Max file size: 30 MB (before base64 encoding)
• videoFile accepts plain base64 or Data URL (data:video/mp4;base64,...)
• Costs 1 credit per API call

Response

The API returns a streaming text response (Content-Type: text/plain; charset=utf-8) containing a Markdown table with:

• Shot number, framing/angle, camera movement
• Detailed visual description
• Audio analysis (BGM, sound effects, narration)
• Duration per shot
• Overall summary

Error Handling

Bundled script

• scripts/reverse_prompt_file.py: Reliable local-file uploader for .mp4 inputs. Use it when the user provides a local video path.

Full API Reference

See references/api.md for complete endpoint documentation.