> ## Documentation Index
> Fetch the complete documentation index at: https://docs.creatify.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Seedance 2.0 Fast (reference-to-video) · Video to video
> Fast version of Seedance 2.0 reference-to-video with quicker generation from reference images, videos, and audio.
[← Seedance](/api-documentation/ai-generation/models/seedance)
**Model name:** `bytedance/seedance-2.0/fast/reference-to-video`\
**Generation type:** `video_to_video`\
**Endpoint:** [`POST /api/asset_generator/`](/api-reference/ai-generation/post-ai-generation)
## Pricing
| Duration | 480p | 720p |
| - | - | - |
| 4s | **2.25** | **5** |
| 5s | **2.75** | **6.25** |
| 6s | **3.25** | **7.5** |
| 7s | **4** | **8.5** |
| 8s | **4.5** | **9.75** |
| 9s | **5** | **11** |
| 10s | **5.5** | **12.25** |
| 11s | **6** | **13.5** |
| 12s | **6.5** | **14.75** |
| 13s | **7** | **15.75** |
| 14s | **7.75** | **17** |
| 15s | **8.25** | **18.25** |
Prices are per output. When a request asks for several outputs, the charge is this price times the number of outputs.
## Quick start
The example uses sample media from our CDN. Swap in publicly accessible URLs for your own files.
```bash cURL theme={null}
curl --request POST \
--url https://api.creatify.ai/api/asset_generator/ \
--header 'Content-Type: application/json' \
--header 'X-API-ID: your-api-id' \
--header 'X-API-KEY: your-api-key' \
--data '{
"model_name": "bytedance/seedance-2.0/fast/reference-to-video",
"input_params": {
"prompt": "The woman from the reference image talks to the camera in a bright café, with the gestures of the reference video.",
"image_urls": [
"https://d35ghwdno3nak3.cloudfront.net/tutorial/avatar-aurora/recommendation-4.jpg"
],
"video_urls": [
"https://d35ghwdno3nak3.cloudfront.net/tutorial/asset-generator/sample-video.mp4"
],
"audio_urls": [
"https://d35ghwdno3nak3.cloudfront.net/user/18165/2025-09-15/2d20-req-3VV9TLO6qlTOflMMQBRe-0-s.mp3"
]
}
}'
```
```python Python theme={null}
import requests
response = requests.post(
"https://api.creatify.ai/api/asset_generator/",
headers={"X-API-ID": "your-api-id", "X-API-KEY": "your-api-key"},
json={
"model_name": "bytedance/seedance-2.0/fast/reference-to-video",
"input_params": {
"prompt": "The woman from the reference image talks to the camera in a bright café, with the gestures of the reference video.",
"image_urls": [
"https://d35ghwdno3nak3.cloudfront.net/tutorial/avatar-aurora/recommendation-4.jpg"
],
"video_urls": [
"https://d35ghwdno3nak3.cloudfront.net/tutorial/asset-generator/sample-video.mp4"
],
"audio_urls": [
"https://d35ghwdno3nak3.cloudfront.net/user/18165/2025-09-15/2d20-req-3VV9TLO6qlTOflMMQBRe-0-s.mp3"
]
},
},
)
print(response.json()["id"])
```
## Input parameters
Send these fields in `input_params`.
The text prompt used to generate the video
Random seed to control video generation. Use -1 for random.
Minimum: `-1`.
Maximum: `4294967295`.
Duration of the video in seconds
Allowed values: `"auto"`, `"4"`, `"5"`, `"6"`, `"7"`, `"8"`, `"9"`, `"10"`, `"11"`, `"12"`, `"13"`, `"14"`, `"15"`.
Video resolution - 480p for faster generation, 720p for balance
Allowed values: `"480p"`, `"720p"`.
The aspect ratio of the generated video
Allowed values: `"auto"`, `"21:9"`, `"16:9"`, `"4:3"`, `"1:1"`, `"3:4"`, `"9:16"`.
Up to 9 reference images (JPEG, PNG, WebP, max 30MB each).
Maximum items: `9`.
Up to 3 reference videos (MP4, MOV, 2-15s combined, max 50MB total).
Maximum items: `3`.
Up to 3 audio files (MP3, WAV, max 15s combined, 15MB per file). Requires at least one image or video reference.
Maximum items: `3`.
Whether to generate synchronized audio for the video
```json theme={null}
{
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"prompt"
],
"properties": {
"seed": {
"type": "integer",
"title": "Seed",
"minimum": -1,
"maximum": 4294967295,
"description": "Random seed to control video generation. Use -1 for random.",
"x-advance-settings": true
},
"prompt": {
"type": "string",
"title": "Prompt",
"description": "The text prompt used to generate the video",
"x-support-types": [
"mentions"
]
},
"duration": {
"enum": [
"auto",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"15"
],
"type": "string",
"title": "Duration",
"default": "auto",
"description": "Duration of the video in seconds"
},
"resolution": {
"enum": [
"480p",
"720p"
],
"type": "string",
"title": "Resolution",
"default": "720p",
"description": "Video resolution - 480p for faster generation, 720p for balance",
"x-advance-settings": true
},
"aspect_ratio": {
"enum": [
"auto",
"21:9",
"16:9",
"4:3",
"1:1",
"3:4",
"9:16"
],
"type": "string",
"title": "Aspect Ratio",
"default": "16:9",
"description": "The aspect ratio of the generated video"
},
"image_urls": {
"type": "array",
"items": {
"type": "string",
"limit_description": "Max file size: 30MB. Supported formats: JPEG, PNG, WebP."
},
"title": "Reference Images",
"maxItems": 9,
"description": "Up to 9 reference images (JPEG, PNG, WebP, max 30MB each).",
"max_file_size": 31457280,
"max_pixels": 36000000,
"min_height": 300,
"min_width": 300,
"max_height": 6000,
"max_width": 6000,
"min_aspect_ratio": 0.4,
"max_aspect_ratio": 2.5,
"x-mention-prefix": "image"
},
"video_urls": {
"type": "array",
"items": {
"type": "string",
"limit_description": "Max total size: 50MB. Duration: 2-15s combined. Supported formats: MP4, MOV. Resolution: 480p-720p."
},
"title": "Reference Videos",
"maxItems": 3,
"description": "Up to 3 reference videos (MP4, MOV, 2-15s combined, max 50MB total).",
"max_file_size": 52428800,
"min_duration": 2,
"max_duration": 15,
"max_total_duration": 15,
"min_pixels": 409600,
"max_aspect_ratio": 2.5
},
"audio_urls": {
"type": "array",
"items": {
"type": "string",
"limit_description": "Max file size: 15MB. Duration: max 15s combined. Supported formats: MP3, WAV."
},
"title": "Reference Audio",
"maxItems": 3,
"description": "Up to 3 audio files (MP3, WAV, max 15s combined, 15MB per file). Requires at least one image or video reference.",
"max_file_size": 15728640,
"min_duration": 2,
"max_duration": 15,
"max_total_duration": 15
},
"generate_audio": {
"type": "boolean",
"title": "Generate Audio",
"default": true,
"description": "Whether to generate synchronized audio for the video",
"x-advance-settings": true
}
}
}
```
## Response
The request returns the task with `status: "initializing"`. Poll [GET /api/asset\_generator/\{id}/](/api-reference/ai-generation/get-ai-generation-) until `status` is `done` or `failed`, or pass a `webhook_url` to be notified. A finished task lists its files in `assets` and the credits it charged in `credits_used`.
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