# Seedance V1.5 | Pro | Text to Video

Seedance 1.5 Text to Video Pro generates high-quality videos with synchronized audio from text prompts, delivering smooth motion, cinematic visuals, and immersive sound in a single creation pipeline.

## API Information

- **Model Slug:** seedance-v1-5-pro-text-to-video
- **Branded URL:** https://www.eachlabs.ai/bytedance/seedance-v1-5/seedance-v1-5-pro-text-to-video
- **Provider:** ByteDance
- **Category:** Text to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** Audio generation enabled: $2.4 per 1M tokens
- **Estimated Processing Time:** 0 seconds
- **Last Updated:** 2026-04-20
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/seedance-v1-5-pro-text-to-video

## Pricing

- **Charge Type:** dynamic
- **Pricing Details:** Audio generation enabled: $2.4 per 1M tokens

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| generate_audio == "false" | Audio generation disabled: $1.2 per 1M tokens |
| Rule 2 | Audio generation enabled: $2.4 per 1M tokens |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | The text prompt used to generate the video |
| aspect_ratio | string | No | 16:9 | 21:9,16:9,4:3,1:1,3:4,9:16 | The aspect ratio of the generated video |
| resolution | string | No | 720p | 480p,720p,1080p | Video resolution - 480p for faster generation, 720p for balance |
| duration | integer | No | 5 | 4,5,6,7,8,9,10,11,12 | Duration of the video in seconds |
| camera_fixed | boolean | No | false | - | Whether to fix the camera position |
| seed | integer | No | - | - | Random seed to control video generation. Use -1 for random. |
| generate_audio | boolean | No | true | - | Whether to generate audio for the video |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seedance-v1-5-pro-text-to-video",
  "input": {
    "prompt": "Ultra-photorealistic studio scene of a professional presenter in a clean modern setting, softly lit with cinematic lighting, facing the camera and speaking clearly with natural lip sync, subtle head and facial movement, smooth camera motion, and no on-screen text or logos, saying: “Welcome. This system transforms ideas into powerful visual experiences.”"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "string (URL of generated video)",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "X-API-Key: YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `X-API-Key` |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**seedance-v1.5-pro-text-to-video — Text to Video AI Model**

Developed by Bytedance as part of the **seedance-v1.5** family, **seedance-v1.5-pro-text-to-video** revolutionizes video creation by generating high-quality videos with natively synchronized audio directly from text prompts, eliminating post-production editing for dialogue, sound effects, and ambient noise.

This **Bytedance text-to-video** model excels in **text-to-video AI model** tasks, producing cinematic visuals with professional camera controls like dolly zooms and tracking shots, all in a single pipeline. Ideal for creators seeking fast, immersive content, it supports 5-10 second clips at up to 1080p resolution, making it a top choice for **text-to-video with audio sync** workflows.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `X-API-Key: YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.