curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gemini-omni-1.2-flash-video-extend",
  "prompt": "The person continues walking forward and slowly exits the frame.",
  "video_urls": [
    "https://example.com/source.mp4"
  ],
  "duration": 3,
  "quality": "auto",
  "aspect_ratio": "auto"
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "gemini-omni-1.2-flash-video-extend",
  "object": "video.generation.task",
  "progress": 0,
  "status": "processing",
  "task_info": {
    "can_cancel": false,
    "estimated_time": 60,
    "video_duration": 6
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_token",
    "credits_reserved": 102.34,
    "user_group": "default"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": "insufficient_quota",
    "message": "Insufficient quota. Please top up your account.",
    "type": "insufficient_quota"
  }
}

{
  "error": {
    "code": "model_access_denied",
    "message": "Token does not have access to model: gemini-omni-1.2-flash-video-extend",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Too many requests, please try again later",
    "type": "rate_limit_error"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Internal server error",
    "type": "api_error"
  }
}

Gemini Omni 1.2 Flash

Gemini Omni 1.2 Flash Video Extend

Gemini Omni 1.2 Flash (gemini-omni-1.2-flash-video-extend) continues an input video with native audio, optionally guided by reference images.
Video: video_urls requires exactly 1 video, up to 30 seconds.
Images: Optionally supply up to 10 reference images via image_urls.
Duration: duration is the number of seconds to append, default 3; it is not the total output duration.
Aspect ratio: aspect_ratio accepts only auto and defaults to auto; output ratio follows the input.
Billing: The output video portion is charged for the appended seconds. The full input video duration, reference images, prompt, and model reasoning also contribute to usage; settlement is based on actual usage.
Resolution: quality accepts 360p, 720p, 1080p, 4k, or auto; default auto follows the input. Explicit values can raise or lower output resolution.
Synchronized native audio is generated automatically, with no additional parameter.
Write negative requirements directly in prompt; there is no separate negative prompt parameter.
Set seed to improve reproducibility.
Asynchronous processing: query task status using the returned task ID.
Generated video links remain valid for 24 hours; save them promptly.

POST

videos

generations

curl --request POST \
  --url https://api.evolink.ai/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gemini-omni-1.2-flash-video-extend",
  "prompt": "The person continues walking forward and slowly exits the frame.",
  "video_urls": [
    "https://example.com/source.mp4"
  ],
  "duration": 3,
  "quality": "auto",
  "aspect_ratio": "auto"
}
'

{
  "created": 1757169743,
  "id": "task-unified-1757169743-7cvnl5zw",
  "model": "gemini-omni-1.2-flash-video-extend",
  "object": "video.generation.task",
  "progress": 0,
  "status": "processing",
  "task_info": {
    "can_cancel": false,
    "estimated_time": 60,
    "video_duration": 6
  },
  "type": "video",
  "usage": {
    "billing_rule": "per_token",
    "credits_reserved": 102.34,
    "user_group": "default"
  }
}

{
  "error": {
    "code": "invalid_request",
    "message": "Invalid request parameters",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "Invalid or expired token",
    "type": "authentication_error"
  }
}

{
  "error": {
    "code": "insufficient_quota",
    "message": "Insufficient quota. Please top up your account.",
    "type": "insufficient_quota"
  }
}

{
  "error": {
    "code": "model_access_denied",
    "message": "Token does not have access to model: gemini-omni-1.2-flash-video-extend",
    "type": "invalid_request_error"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Too many requests, please try again later",
    "type": "rate_limit_error"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Internal server error",
    "type": "api_error"
  }
}

Authorizations

Authorization

string

header

required

##All endpoints require authentication using a Bearer Token##

Get your API Key:

Visit the API Key management page to obtain your API Key

Add it to the request header:

Authorization: Bearer YOUR_API_KEY

Body

application/json

model

enum<string>

default:gemini-omni-1.2-flash-video-extend

required

Model name, fixed to gemini-omni-1.2-flash-video-extend

Available options:

gemini-omni-1.2-flash-video-extend

Example:

"gemini-omni-1.2-flash-video-extend"

prompt

string

required

Text prompt describing what should happen after the input video ends.

Supports Chinese and English. For more stable results, describe the desired action and changes clearly. Write negative requirements directly in prompt, such as No dialogue or No text; there is no separate negative prompt parameter.

The prompt is required and must not be empty or contain only whitespace.

Minimum string length: 1

Pattern: \S

Example:

"The person continues walking forward and slowly exits the frame."

video_urls

string<uri>[]

required

Exactly one directly reachable HTTP/HTTPS MP4, no longer than 30 seconds.

Required array length: 1 element

Example:

["https://example.com/source.mp4"]

image_urls

string<uri>[]

Optional reference image array, up to 10 images. It may be used with the video being extended to constrain subjects, style, or elements.

Input requirements:

HTTP/HTTPS image URLs only
Supported formats: png, jpeg, webp

Billing: Every reference image contributes input tokens.

Required array length: 1 - 10 elements

Example:

["https://example.com/reference.png"]

duration

integer

default:3

Appended video duration in seconds; default 3.

Notes:

Accepts any integer from 3 to 10
Specifies how many seconds are generated after the input video, not the total output duration
Total output duration = input video duration + duration
Appended duration directly affects billing

Required range: 3 <= x <= 10

Example:

3

quality

enum<string>

default:auto

Output video resolution; default auto.

360p: short edge 360.
720p: short edge 720.
1080p: short edge 1080.
4k: short edge 2160.
auto: follows the input resolution; this is the default.

Choosing an explicit value can raise or lower output resolution.

Billing: Output video tokens increase with output resolution. Input video also contributes tokens; higher resolution costs more.

Available options:

360p,

720p,

1080p,

4k,

auto

Example:

"auto"

aspect_ratio

enum<string>

default:auto

Only auto is accepted and it is the default. Output aspect ratio follows the input video.

Available options:

auto

Example:

"auto"

seed

integer

Random seed; random by default.

Range: 0–4294967295.
Fixing the seed reduces variation from parameter changes when tuning prompts and improves reproducibility.

Required range: 0 <= x <= 4294967295

Example:

42

callback_url

string<uri>

HTTPS callback URL to notify when the task completes

Callback timing:

Triggered when the task completes (completed), fails (failed), or is cancelled (cancelled)
Sent after billing is confirmed

Security restrictions:

HTTPS protocol only
Callbacks to internal IP addresses are forbidden (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 on failure (retried 1s / 2s / 4s after each failure respectively)
The callback body format matches the response of the task query endpoint
A 2xx status code from the callback URL is treated as success; other status codes trigger a retry

Example:

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

Response

Video task created successfully

created

integer

Task creation timestamp

Example:

1757169743

string

Task ID

Example:

"task-unified-1757169743-7cvnl5zw"

model

string

The model name actually used

Example:

"gemini-omni-1.2-flash-video-extend"

object

enum<string>

The 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. The create endpoint always returns processing; the internal pending state is also exposed to clients as processing.

Available options:

pending,

processing,

completed,

failed

Example:

"processing"

task_info

object

Detailed video task information

Show child attributes

type

enum<string>

The output type of the task

Available options:

text,

image,

audio,

video

Example:

"video"

usage

object

Usage and billing information

Show child attributes

Image Series

Video Series

Audio Series

Text Series

Account Management

Task Management

File Management

Gemini Omni 1.2 Flash Video Extend

Authorizations

Body

Response