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. 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 INLINECODE1
• Paste the API key as its value

Equivalent config shape:

CODEBLOCK0

Other valid ways to provide the key:

• - Shell: INLINECODE2
• Tool-specific env config: any runtime that injects INLINECODE3

Credential declaration summary:

• - Required env var: INLINECODE4
• Primary credential: INLINECODE5
• No unrelated credentials are required

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

Workflow

1. 1. Collect the video source from the user (YouTube link, direct .mp4 URL, or local file path)
2. Determine videoSource type: youtube, url, or INLINECODE9
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

CODEBLOCK1

Direct Video URL

CODEBLOCK2

Local File (Preferred: bundled script)

CODEBLOCK3

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)

CODEBLOCK4

Parameters

Parameter	Type	Required	Description
INLINECODE11	string	Yes	INLINECODE12, url, or INLINECODE14
INLINECODE15

string | No | Output language (default: en). Supported: en, zh, zh-TW, ja, ko, es, fr, de, pt, ru, ar | | videoUrl | string | Conditional | YouTube link or direct .mp4 URL | | videoFile | string | Conditional | Base64-encoded video (when videoSource is file) | | videoFileName | string | No | Original filename for uploaded videos |

Constraints

• - Only .mp4 format supported
• Max file size: 30 MB (before base64 encoding)
• INLINECODE34 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

errorCode	HTTP	Cause	Action
INLINECODE37	401	Invalid or missing API key	Verify key at https://nanophoto.ai/settings/apikeys
INLINECODE38

429 | Rate limit exceeded | Wait and retry | | INSUFFICIENT_CREDITS | 402 | Not enough credits | Top up credits | | INVALID_INPUT | 400 | Missing required parameters | Check videoSource and corresponding fields | | INVALID_YOUTUBE_URL | 400 | Invalid YouTube URL | Ask user for a valid YouTube link | | INVALID_VIDEO_URL | 400 | Invalid video URL | Ask user for a valid .mp4 URL | | INVALID_FORMAT | 400 | Not MP4 format | Only .mp4 is supported | | FILE_TOO_LARGE | 400 | File exceeds 30 MB | Ask user for a smaller file | | VIDEO_DOWNLOAD_FAILED | 400 | Cannot download video | Check URL accessibility | | VIDEO_PROCESSING_FAILED | 422 | Processing error | Retry or try a different video | | AI_SERVICE_ERROR | 503 | AI service unavailable | Retry later |

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.