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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": "happyhorse-1.0-video-edit", "prompt": "Have the character in the video wear the striped sweater from the image", "video_urls": [ "https://cdn.example.com/source.mp4" ], "image_urls": [ "https://cdn.example.com/sweater.jpg" ], "quality": "720p", "keep_original_sound": true } '
{
  "created": 1761313744,
  "id": "task-unified-1761313744-h1edgh12",
  "model": "happyhorse-1.0-video-edit",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": true,
    "estimated_time": 2400,
    "video_duration": 6
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_second",
    "credits_reserved": 1608660,
    "user_group": "default"
  }
}

Authorizations

​
Authorization
string
header
required

##All endpoints require Bearer Token authentication##

Get API Key:

Visit the API Key Management Page to obtain your API Key

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json
​
model
enum<string>
default:happyhorse-1.0-video-edit
required

Video generation model name

Available options:
happyhorse-1.0-video-edit
Example:

"happyhorse-1.0-video-edit"

​
prompt
string
required

Edit instruction text, required

Length limits:

  • Chinese: up to 2500 characters
  • Non-Chinese: up to 5000 characters
  • Excess content is automatically truncated

Prompt tips:

  • Use editing instructions instead of creative descriptions
  • Examples: Replace the protagonist's clothes with the striped sweater in the image, Replace the video background with snowy mountains
Example:

"Have the character in the video wear the striped sweater from the image"

​
video_urls
string<uri>[]
required

Source video URL to edit, required, only 1 (the first item of the array is taken)

Video requirements:

  • Supported formats: MP4, MOV (H.264 encoding recommended)
  • Duration: 3 ~ 60 seconds
  • The model automatically truncates inputs longer than 15 seconds to the first 15 seconds
  • Resolution: long edge ≤ 2160 px, short edge ≥ 320 px
  • Aspect ratio: 1:2.5 ~ 2.5:1
  • File size: ≤ 100MB
  • Frame rate: > 8 fps
  • Video URL must be publicly accessible (HTTP or HTTPS); private OSS, intranet, or authenticated links are not supported

Compatible fields: video_url / video are also accepted (lower priority than video_urls)

Required array length: 1 element
Example:
["https://cdn.example.com/source.mp4"]
​
image_urls
string<uri>[]

Reference image URL array, optional, 0 ~ 5 images

Used for style / subject guidance.

Image requirements:

  • Supported formats: JPEG, JPG, PNG, WEBP
  • Resolution: width and height ≥ 300 px
  • Aspect ratio: 1:2.5 ~ 2.5:1
  • File size: ≤ 10MB
  • Image URLs must be publicly accessible (HTTP or HTTPS)
Maximum array length: 5
Example:
["https://cdn.example.com/sweater.jpg"]
​
keep_original_sound
boolean
default:false

Whether to keep the original audio of the input video, defaults to false

Options:

  • true: Keep the original audio of the input video
  • false: Discard the original audio; the model generates new audio
Example:

false

​
quality
enum<string>
default:720p

Video resolution tier, defaults to 720p

Options:

  • 720p: Standard clarity, this is the default
  • 1080p: HD clarity

Billing note: Resolution tier directly affects billing

Available options:
720p,
1080p
Example:

"720p"

​
seed
integer

Random seed, default is random

Details:

  • Range: 1 ~ 2147483647
  • A fixed seed reduces parameter-induced variation when iterating on prompts and improves reproducibility
Required range: 1 <= x <= 2147483647
Example:

42

​
callback_url
string<uri>

HTTPS callback URL for task completion

Callback timing:

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

Security restrictions:

  • Only HTTPS protocol is supported
  • Callbacks to private 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
  • Up to 3 retries after failure (at 1/2/4 seconds after failure respectively)
  • Callback response body format is consistent with the task query endpoint response format
  • A 2xx status code is considered successful; other status codes trigger retries
Example:

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

Response

Video generation task created successfully

​
created
integer

Task creation timestamp

Example:

1761313744

​
id
string

Task ID

Example:

"task-unified-1761313744-h1edgh12"

​
model
string

Actual model name used

Example:

"happyhorse-1.0-video-edit"

​
object
enum<string>

Specific type of the task

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,
cancelled
Example:

"pending"

​
task_info
object

Video task details

​
type
enum<string>

Output type of the task

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

"video"

​
usage
object

Usage and billing information