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POST
/
v1
/
videos
/
generations
curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "kling-o3-reference-to-video",
  "prompt": "Keep the same motion style, change to a snowy background",
  "video_url": "https://example.com/reference.mp4",
  "duration": 5,
  "aspect_ratio": "16:9",
  "quality": "720p"
}
'
{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "kling-o3-reference-to-video",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 300,
    "video_duration": 9
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_call",
    "credits_reserved": 7,
    "user_group": "default"
  }
}

Authorizations

​
Authorization
string
header
required

All APIs require Bearer Token authentication

Get API Key:

Visit API Key Management Page to get your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json
​
model
enum<string>
default:kling-o3-reference-to-video
required

Video generation model name

Available options:
kling-o3-reference-to-video
Example:

"kling-o3-reference-to-video"

​
prompt
string
required

Text prompt, max 2500 characters

Reference syntax: You can reference elements, images, and videos in the prompt using <<<xxx>>> syntax, for example: <<<element_1>>> walking in the scene style of <<<video_1>>>

Maximum string length: 2500
Example:

"Keep the same motion style, change to a snowy background"

​
video_url
string<uri>

Reference video URL

Video format requirements:

  • Format: MP4 / MOV
  • Size: <= 200MB
  • Duration: >= 3 seconds
  • Dimensions: width and height 720px ~ 2160px
  • Frame rate: 24fps ~ 60fps
  • Video URL must be directly accessible by the server
Example:

"https://example.com/reference.mp4"

​
keep_original_sound
boolean
default:true

Whether to keep original sound from reference video

Options:

  • true: Keep the original video sound (default)
  • false: Do not keep the original video sound
Example:

true

​
image_urls
string<uri>[]

Reference image URL array (style/scene reference)

Constraint: Image count + element count <= 4 when video is provided

Note:

  • Image URLs must be directly accessible by the server or trigger a direct download when accessed
Example:
["https://example.com/style.jpg"]
​
duration
integer
default:5

Video duration (seconds), range 3~10

Note: Shorter than the 15-second maximum for text-to-video/image-to-video, max supported duration is 10 seconds

Required range: 3 <= x <= 10
Example:

5

​
aspect_ratio
enum<string>

Video aspect ratio

Options:

  • 16:9: Landscape video
  • 9:16: Portrait video
  • 1:1: Square video
Available options:
16:9,
9:16,
1:1
Example:

"16:9"

​
quality
enum<string>
default:720p

Resolution tier

Options:

  • 720p: Standard 720P
  • 1080p: High quality 1080P
Available options:
720p,
1080p
Example:

"720p"

​
model_params
object

Advanced parameters

​
callback_url
string<uri>

HTTPS callback URL for task completion

Callback Timing:

  • Triggered when task is completed, failed, or cancelled
  • Sent after billing confirmation

Security Restrictions:

  • HTTPS protocol only
  • Internal IP addresses are prohibited (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.)
  • URL length must not exceed 2048 characters

Callback Mechanism:

  • Timeout: 10 seconds
  • Maximum 3 retries after failure (at 1/2/4 seconds after failure)
  • Callback response format is consistent with task query API
  • 2xx status code is considered successful, other codes trigger retry
Example:

"https://your-domain.com/webhooks/video-task-completed"

Response

Video generation task created successfully

​
created
integer

Task creation timestamp

Example:

1757169743

​
id
string

Task ID

Example:

"task-unified-1757169743-7cvnl5zw"

​
model
string

Actual model name used

Example:

"kling-o3-reference-to-video"

​
object
enum<string>

Task type

Available options:
video.generation.task
​
progress
integer

Task progress percentage (0-100)

Required range: 0 <= x <= 100
Example:

0

​
status
enum<string>

Task status

Available options:
pending,
processing,
completed,
failed
Example:

"pending"

​
task_info
object

Video task details

​
type
enum<string>

Task output type

Available options:
text,
image,
audio,
video
Example:

"video"

​
usage
object

Usage and billing information