Documentation Index
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First and last frame video generation. See supported inputs, parameters, pricing, response fields, and API examples.
first_frame_url, last_frame_url, or both. Supports 4–12 second durations at 480p, 720p, or 1080p.
bytedance/seedance-1.0-pro
| Request type | Required inputs | Optional inputs | Notes |
|---|---|---|---|
| First/last frame | At least one of first_frame_url or last_frame_url | prompt, aspect_ratio, duration, resolution, camera_fixed, seed | prompt optional |
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
prompt | string | No | "" | Text prompt (max 5000 chars). Optional |
aspect_ratio | string | No | "16:9" | 1:1, 3:4, 4:3, 9:16, 16:9, 21:9 |
duration | integer | No | 4 | Output duration in seconds (4–12). Sent to provider as frames = 24 × seconds + 1 |
resolution | string | No | "480p" | 480p, 720p, 1080p |
seed | integer | No | — | Seed for reproducibility. Omit for a random seed. |
camera_fixed | boolean | No | false | When true, keeps the virtual camera stationary throughout the clip |
first_frame_url | string | No | null | First frame image URL. Formats: png, webp, jpeg, gif. Max 30 MB. Dimensions: 300–6000 px (short side). Aspect ratio: 0.4–2.5 |
last_frame_url | string | No | null | Last frame image URL. Same format and size limits as first_frame_url |
nsfw_check | boolean | No | true | Check uploaded media inputs for NSFW content |
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bytedance/seedance-1.0-pro",
"input": {
"prompt": "Smooth transition between poses",
"duration": 10,
"resolution": "720p",
"first_frame_url": "https://example.com/start.jpg",
"last_frame_url": "https://example.com/end.jpg"
}
}'
{
"code": 200,
"success": true,
"data": {
"task_id": "abc123def456",
"status": "processing"
}
}