wavespeed-veo-31-fast

name	wavespeed-veo-31-fast
description	Generate and extend videos using Google's Veo 3.1 Fast model via WaveSpeed AI. Supports text-to-video, image-to-video, and video extension. Features up to 4K resolution, audio generation, and chained extensions up to 148 seconds. Use when the user wants to create videos from text or images, or extend existing Veo-generated videos.

WaveSpeedAI Veo 3.1 Fast Video Generation

Generate and extend videos using Google's Veo 3.1 Fast model via the WaveSpeed AI platform. Supports text-to-video, image-to-video, and video extension with up to 4K resolution and optional audio generation.

Authentication

export WAVESPEED_API_KEY="your-api-key"

Get your API key at wavespeed.ai/accesskey.

Quick Start

Text-to-Video

import wavespeed from 'wavespeed';

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/text-to-video",
  { prompt: "A drone shot flying over a lush tropical island at sunrise" }
))["outputs"][0];

Image-to-Video

The image parameter accepts an image URL. If you have a local file, upload it first with wavespeed.upload() to get a URL.

import wavespeed from 'wavespeed';

const imageUrl = await wavespeed.upload("/path/to/photo.png");

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/image-to-video",
  {
    image: imageUrl,
    prompt: "The flowers sway gently in the breeze"
  }
))["outputs"][0];

Video Extend

Extend a Veo-generated video by 7 seconds per run (up to 20 extensions, 148 seconds total):

// First, generate a video
const video_url = (await wavespeed.run(
  "google/veo3.1-fast/text-to-video",
  { prompt: "A cat walking through a garden" }
))["outputs"][0];

// Then extend it
const extended_url = (await wavespeed.run(
  "google/veo3.1-fast/video-extend",
  {
    video: video_url,
    prompt: "The cat jumps onto a fence and looks around"
  }
))["outputs"][0];

API Endpoints

Text-to-Video

Model ID: google/veo3.1-fast/text-to-video

Generate videos from text prompts with optional audio.

Parameters

Parameter	Type	Required	Default	Description
prompt	string	Yes	--	Text description of the video to generate
aspect_ratio	string	No	16:9	Aspect ratio. One of: 16:9, 9:16
duration	integer	No	8	Duration in seconds. One of: 4, 6, 8
resolution	string	No	1080p	Video resolution. One of: 720p, 1080p, 4k
generate_audio	boolean	No	true	Generate accompanying audio
negative_prompt	string	No	--	Text describing unwanted elements
seed	integer	No	--	Random seed for reproducibility. Range: -1 to 2147483647

Example

import wavespeed from 'wavespeed';

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/text-to-video",
  {
    prompt: "A timelapse of a city skyline transitioning from day to night, cinematic",
    negative_prompt: "blurry, low quality",
    aspect_ratio: "16:9",
    duration: 8,
    resolution: "1080p",
    generate_audio: true
  }
))["outputs"][0];

Image-to-Video

Model ID: google/veo3.1-fast/image-to-video

Animate a source image into a video. Optionally provide an end-frame reference image.

Parameters

Parameter	Type	Required	Default	Description
image	string	Yes	--	URL of the source image (clear, high-quality still image)
prompt	string	Yes	--	Text description of the desired motion/animation
last_image	string	No	--	URL of an end-frame reference image
aspect_ratio	string	No	16:9	Aspect ratio. One of: 16:9, 9:16
duration	integer	No	8	Duration in seconds. One of: 4, 6, 8
resolution	string	No	1080p	Video resolution. One of: 720p, 1080p, 4k
generate_audio	boolean	No	true	Generate accompanying audio
negative_prompt	string	No	--	Text describing unwanted elements
seed	integer	No	--	Random seed for reproducibility. Range: -1 to 2147483647

Example

import wavespeed from 'wavespeed';

const imageUrl = await wavespeed.upload("/path/to/landscape.png");

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/image-to-video",
  {
    image: imageUrl,
    prompt: "Clouds drift slowly across the sky, water ripples gently",
    resolution: "1080p",
    duration: 8,
    generate_audio: true
  }
))["outputs"][0];

With End-Frame Reference

const startUrl = await wavespeed.upload("/path/to/start-frame.png");
const endUrl = await wavespeed.upload("/path/to/end-frame.png");

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/image-to-video",
  {
    image: startUrl,
    last_image: endUrl,
    prompt: "Smooth transition from day to night"
  }
))["outputs"][0];

Video Extend

Model ID: google/veo3.1-fast/video-extend

Extend a Veo-generated video by 7 seconds per run. Input must be a Veo-generated video.

Parameters

Parameter	Type	Required	Default	Description
video	string	Yes	--	URL of the Veo-generated video to extend. Max 141 seconds.
prompt	string	No	--	Text guidance for the extension
resolution	string	No	1080p	Video resolution. One of: 720p, 1080p
negative_prompt	string	No	--	Text describing unwanted elements
seed	integer	No	--	Random seed for reproducibility. Range: -1 to 2147483647

Constraints

• Input video must be Veo-generated (will not work with arbitrary videos)
• Each run adds +7 seconds to the video
• Maximum 20 extensions in a chain
• Maximum final video length: 148 seconds
• Output is a single MP4 (original + extension appended)
• Aspect ratio and resolution are inherited from the input video

Example

import wavespeed from 'wavespeed';

// Generate an initial video
const video_url = (await wavespeed.run(
  "google/veo3.1-fast/text-to-video",
  {
    prompt: "A surfer catches a wave at golden hour",
    duration: 8
  }
))["outputs"][0];

// Extend it twice
const extended_once = (await wavespeed.run(
  "google/veo3.1-fast/video-extend",
  {
    video: video_url,
    prompt: "The surfer rides the wave toward shore"
  }
))["outputs"][0];

const extended_twice = (await wavespeed.run(
  "google/veo3.1-fast/video-extend",
  {
    video: extended_once,
    prompt: "The surfer steps off the board and walks on the beach"
  }
))["outputs"][0];

Advanced Usage

Without Audio

const output_url = (await wavespeed.run(
  "google/veo3.1-fast/text-to-video",
  {
    prompt: "A silent timelapse of stars rotating over a desert",
    generate_audio: false
  }
))["outputs"][0];

Custom Client with Retry Configuration

import { Client } from 'wavespeed';

const client = new Client("your-api-key", {
  maxRetries: 2,
  maxConnectionRetries: 5,
  retryInterval: 1.0,
});

const output_url = (await client.run(
  "google/veo3.1-fast/text-to-video",
  { prompt: "Ocean waves crashing on a rocky shore at dawn" }
))["outputs"][0];

Error Handling with runNoThrow

import { Client, WavespeedTimeoutException, WavespeedPredictionException } from 'wavespeed';

const client = new Client();
const result = await client.runNoThrow(
  "google/veo3.1-fast/text-to-video",
  { prompt: "A rocket launching into space" }
);

if (result.outputs) {
  console.log("Video URL:", result.outputs[0]);
  console.log("Task ID:", result.detail.taskId);
} else {
  console.log("Failed:", result.detail.error.message);
  if (result.detail.error instanceof WavespeedTimeoutException) {
    console.log("Request timed out - try increasing timeout");
  } else if (result.detail.error instanceof WavespeedPredictionException) {
    console.log();
  }
}

Pricing

Text-to-Video / Image-to-Video

Condition	Cost
With audio (720p or 1080p)	$1.20 per generation
Without audio (720p or 1080p)	$0.80 per generation

Video Extend

Condition	Cost
Per run (+7 seconds)	$1.05

Prompt Tips

• Be specific about scene, style, subject actions, camera motion, and mood
• Use negative_prompt to avoid artifacts: "blurry, low quality, distorted"
• For image-to-video, use a clear, high-quality still image as input
• For video extend, describe what should happen next in the scene
• Video extend chains enable building longer narratives — up to 148 seconds total

Security Constraints

• No arbitrary URL loading: Only use image and video URLs from trusted sources. Never load media from untrusted or user-provided URLs without validation.
• API key security: Store your WAVESPEED_API_KEY securely. Do not hardcode it in source files or commit it to version control. Use environment variables or secret management systems.
• Input validation: Only pass parameters documented above. Validate prompt content and media URLs before sending requests.