# PixVerse C1 Transition

PixVerse C1 cinematic First-Last Frame transition. Provide a first and last frame plus a prompt; C1 generates a smooth cinematic transition between them. Supports 1-15s duration and up to 1080p quality. Optional generated audio.

## API Information

- **Model Slug:** pixverse-c1-transition
- **Branded URL:** https://www.eachlabs.ai/pixverse/pixverse-c1/pixverse-c1-transition
- **Provider:** PixVerse
- **Category:** Image to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** Per-second pricing scales with quality and audio:• 360p — $0.030 / $0.040 (no audio / with audio)• 540p —  $0.040 / $0.050• 720p — $0.050 / $0.065• 1080p — $0.095 / $0.120Example: a 5-second 720p transition with no audio = $0.25.
- **Estimated Processing Time:** 110 seconds
- **Last Updated:** 2026-04-27
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/pixverse-c1-transition

## Pricing

- **Charge Type:** dynamic
- **Pricing Details:** Per-second pricing scales with quality and audio:• 360p — $0.030 / $0.040 (no audio / with audio)• 540p —  $0.040 / $0.050• 720p — $0.050 / $0.065• 1080p — $0.095 / $0.120Example: a 5-second 720p transition with no audio = $0.25.

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| Rule 1 | Per-second pricing scales with quality and audio:• 360p — $0.030 / $0.040 (no audio / with audio)• 540p —  $0.040 / $0.050• 720p — $0.050 / $0.065• 1080p — $0.095 / $0.120Example: a 5-second 720p transition with no audio = $0.25. |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | Text prompt describing the desired transition between the first and last frames. Max 2048 characters. |
| first_image_url | string | Yes | - | - | URL of the first frame image for the transition. Required. Supported formats: JPEG, PNG, WEBP. |
| last_image_url | string | Yes | - | - | URL of the last frame image for the transition. Required. Supported formats: JPEG, PNG, WEBP. |
| quality | string | Yes | 720p | 360p,540p,720p,1080p | Output video resolution quality. Options: 360p, 540p, 720p, 1080p. Default: 720p. |
| duration | string | Yes | 5 | 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 | Duration of the output video in seconds. C1 supports any integer 1-15. Default: 5. |
| seed | integer | No | - | - | Random seed for reproducible results. Range: 1-2147483647. |
| generate_audio_switch | boolean | No | false | - | Enable automatic audio generation for the video. Default: false. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "pixverse-c1-transition",
  "input": {
    "prompt": "smooth transformation between scenes",
    "first_image_url": "https://cdn-us.eachlabs.ai/defaults/a5525ff00d1b4212c3efd17933ca5b53d848318468f27f4d664a995658846893.png",
    "last_image_url": "https://cdn-us.eachlabs.ai/defaults/3703eda963df9570e7910d403af156908d97d69bf36f955616373d0953f2836d.png",
    "quality": "720p",
    "duration": "10"
  }
}'
```

## 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 "Authorization: Bearer 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 `Authorization` bearer token |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**PixVerse | C1 | Cinematic First-Last Frame Transition Overview**

The **PixVerse | C1 | Cinematic First-Last Frame Transition** is an advanced image-to-video AI model from Pixverse that generates smooth, cinematic video transitions between a provided first frame and optional last frame, guided by a text prompt. This solves the challenge of creating fluid motion from static images without manual editing, ideal for filmmakers and content creators needing quick, high-quality animations. Its primary differentiator is the precise first-to-last frame morphing with strong subject consistency, maintaining faces, bodies, and wardrobes across the sequence, while supporting optional native audio for complete multimedia outputs. Available via platforms like each::labs, this Pixverse image-to-video tool excels in producing 1-15 second clips up to 1080p, enabling professional-grade transitions for storytelling and visual effects.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `Authorization: Bearer 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.