> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crun.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Wan 2.7 Reference to Video
> Use Wan 2.7 reference-to-video to generate video from reference images or videos.
## Duration Limit
When any item in `reference_medias` includes `reference_video`, `duration` must be 10 seconds or less. Durations longer than 10 seconds are only supported when all reference media are images.
## Query Task Status
After submitting a task, use the unified query endpoint to check progress and retrieve results:
Learn how to query task status and retrieve generation results
For production use, we recommend using the `callback_url` parameter to receive automatic notifications when generation completes, rather than polling the status endpoint.
## Related Resources
Explore all available models
Check credits and account usage
## OpenAPI
````yaml models/wan/2-7-reference-to-video.json post /api/v1/client/job/CreateTask
openapi: 3.0.0
info:
title: Crun Wan 2.7 Reference to Video API
description: crun.ai Wan 2.7 Video API Documentation
version: 1.0.0
contact:
name: Technical Support
email: support@crun.ai
servers:
- url: https://api.crun.ai
description: API Server
security:
- ApiKeyAuth: []
paths:
/api/v1/client/job/CreateTask:
post:
summary: Generate video using Wan 2.7 reference-to-video
operationId: wan-2-7-r2v
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- model
- input
properties:
model:
type: string
enum:
- wan/2-7-r2v
description: |-
The model name to use for generation. Required field.
- Must be `wan/2-7-r2v` for this endpoint
callback_url:
type: string
format: uri
description: >-
Optional. Callback URL for receiving task completion
notifications.
- System will POST task status and results to this URL when
generation completes
- Callback payloads structure is consistent with the `data`
object returned by the task status query
- Your callback endpoint should accept POST requests with
JSON payload containing results
- It returns an HTTP 200 status code upon successful receipt
example: https://your-domain.com/api/callback
input:
type: object
description: >-
Input parameters for the Wan 2.7 reference-to-video
generation task.
properties:
prompt:
type: string
description: >-
Text prompt describing the video content or editing
request.
minLength: 1
maxLength: 5000
example: >-
A cinematic slow-motion scene of a rain-soaked city
street at night, neon reflections on the wet pavement.
negative_prompt:
type: string
description: Negative prompt to exclude unwanted elements. Optional.
maxLength: 500
example: No people, no text, no logos.
reference_medias:
type: array
description: >-
Reference media list. Supports 1 to 5 objects. Each
object must provide either `reference_image` or
`reference_video`, and may include `reference_voice`.
**Duration rule**:
- When any reference media item includes
`reference_video`, `duration` must be 10 seconds or
less.
- Durations longer than 10 seconds are only supported
when all reference media are images.
**Reference image restrictions**:
- Supported formats: JPEG, JPG, PNG (transparent channel
not supported), BMP, WEBP.
- Resolution: width and height must both be within [240,
8000] pixels.
- Aspect ratio: 1:8 to 8:1.
- File size: up to 20 MB per image.
**Reference video restrictions**:
- Supported formats: MP4, MOV.
- Duration: 1 to 30 seconds.
- Resolution: width and height must both be within [240,
4096] pixels.
- Aspect ratio: 1:8 to 8:1.
- File size: up to 100 MB per video.
**Reference voice restrictions**:
- Supported formats: WAV, MP3.
- Duration: 1 to 10 seconds.
- File size: up to 15 MB.
minItems: 1
maxItems: 5
items:
type: object
properties:
reference_image:
type: string
format: uri
description: >-
Reference image URL.
**Image restrictions**:
- Supported formats: JPEG, JPG, PNG (transparent
channel not supported), BMP, WEBP.
- Resolution: width and height must both be within
[240, 8000] pixels.
- Aspect ratio: 1:8 to 8:1.
- File size: up to 20 MB.
reference_video:
type: string
format: uri
description: >-
Reference video URL.
When this field is provided in any
`reference_medias` item, `duration` must be 10
seconds or less.
**Video restrictions**:
- Supported formats: MP4, MOV.
- Duration: 1 to 30 seconds.
- Resolution: width and height must both be within
[240, 4096] pixels.
- Aspect ratio: 1:8 to 8:1.
- File size: up to 100 MB.
reference_voice:
type: string
format: uri
description: >-
Audio URL used to specify the voice timbre of the
subject character in the reference media (image or
video). Use it together with `reference_image` or
`reference_video`. This audio is used only as a
voice timbre reference and is unrelated to spoken
content. For better matching, keep the reference
audio language consistent with the prompt
language.
**Voice audio behavior**:
- Default: if `reference_video` contains audio and
`reference_voice` is not specified, the original
video audio is used by default.
- Priority: if both `reference_video` with audio
and `reference_voice` are provided,
`reference_voice` takes priority and overrides the
original video audio timbre.
**Audio restrictions**:
- Supported formats: WAV, MP3.
- Duration: 1 to 10 seconds.
- File size: up to 15 MB.
example:
- reference_image: https://example.com/reference-character.png
reference_voice: https://example.com/reference-voice.mp3
- reference_video: https://example.com/reference-motion.mp4
duration:
type: integer
description: >-
Video duration in seconds. Supports 2 to 15 seconds.
When any item in `reference_medias` includes
`reference_video`, the duration must be 10 seconds or
less.
minimum: 2
maximum: 15
default: 5
example: 10
resolution:
type: string
description: Output video resolution.
enum:
- 1080P
- 720P
default: 720P
example: 1080P
aspect_ratio:
type: string
description: Aspect ratio of the generated video.
enum:
- '16:9'
- '9:16'
- '4:3'
- '3:4'
- '1:1'
default: '16:9'
example: '16:9'
region:
type: string
description: >-
Service region. mainland: China Mainland, global:
International
enum:
- mainland
- global
nullable: true
default: null
example: global
prompt_extend:
type: boolean
description: Whether to automatically extend the prompt.
default: false
example: false
input_compliance:
type: string
nullable: true
description: >-
Optional input compliance check switch. Use `enable` to
turn input checks on, `disable` to turn them off, or
omit/pass `null` to use the default setting.
enum:
- disable
- enable
default: null
example: enable
output_compliance:
type: string
nullable: true
description: >-
Optional output compliance check switch. Use `enable` to
turn output checks on, `disable` to turn them off, or
omit/pass `null` to use the default setting.
enum:
- disable
- enable
default: null
example: enable
required:
- prompt
- reference_medias
example:
model: wan/2-7-r2v
callback_url: https://your-domain.com/api/callback
input:
prompt: >-
A character walking through a neon-lit alley while keeping the
reference appearance consistent.
reference_medias:
- reference_image: https://example.com/reference-character.png
reference_voice: https://example.com/reference-voice.mp3
resolution: 1080P
aspect_ratio: '16:9'
region: global
duration: 10
prompt_extend: false
input_compliance: enable
output_compliance: enable
responses:
'200':
description: Request successful
content:
application/json:
schema:
allOf:
- $ref: '#/components/schemas/ApiResponse'
- type: object
properties:
data:
type: object
properties:
task_id:
type: string
description: >-
Task ID, can be used with Get Task Details
endpoint to query task status
example: task_12345678
example:
code: 200
message: success
data:
task_id: task_12345678
'422':
description: Validation Error
content:
application/json:
schema:
allOf:
- $ref: '#/components/schemas/ApiResponse'
- type: object
properties:
errors:
type: array
description: Detailed validation error messages
items:
type: string
example:
- specific error field message
example:
code: 422
message: Missing Params or Type Error
errors:
- specific error field message
'500':
$ref: '#/components/responses/Error'
components:
schemas:
ApiResponse:
type: object
properties:
code:
type: integer
enum:
- 200
- 401
- 402
- 404
- 422
- 429
- 455
- 500
- 501
- 505
description: >-
Response status code
- **200**: Success - Request has been processed successfully
- **401**: Unauthorized - Authentication credentials are missing or
invalid
- **402**: Insufficient Credits - Account does not have enough
credits to perform the operation
- **404**: Not Found - The requested resource or endpoint does not
exist
- **422**: Validation Error - The request parameters failed
validation checks
- **429**: Rate Limited - Request limit has been exceeded for this
resource
- **455**: Service Unavailable - System is currently undergoing
maintenance
- **500**: Server Error - An unexpected error occurred while
processing the request
- **501**: Generation Failed - Content generation task failed
- **505**: Feature Disabled - The requested feature is currently
disabled
message:
type: string
description: Response message, error description when failed
example: success
responses:
Error:
description: Server Error
securitySchemes:
ApiKeyAuth:
type: apiKey
in: header
name: x-api-key
description: >-
All APIs require authentication via API Key.
Get API Key:
1. Visit [API Key Management Page](https://crun.ai/user-api-key) to get
your API Key
Usage:
Add to request header:
x-api-key: YOUR_API_KEY
Note:
- Keep your API Key secure and do not share it with others
- If you suspect your API Key has been compromised, reset it immediately
in the management page
````