Veo-3.1 Code Examples

Python Complete Example

Using OpenAI SDK

pip install openai

Complete Text-to-Video Example

from openai import OpenAI
import time

class Veo31Client:
    def __init__(self, api_key):
        self.client = OpenAI(
            api_key=api_key,
            base_url="https://api.laozhang.ai/v1"
        )

    def generate_video_from_text(self, prompt, model="veo-3.1", n=1):
        """Text-to-video generation"""
        try:
            response = self.client.chat.completions.create(
                model=model,
                messages=[{
                    "role": "user",
                    "content": [
                        {
                            "type": "text",
                            "text": prompt
                        }
                    ]
                }],
                stream=True,
                n=n
            )

            print(f"Starting video generation... (model: {model})")

            for chunk in response:
                if chunk.choices[0].delta.content:
                    content = chunk.choices[0].delta.content
                    print(f"Received data: {content}")

            print("Video generation complete!")

        except Exception as e:
            print(f"Error: {e}")

    def generate_video_from_images(self, prompt, image_urls, model="veo-3.1-fl"):
        """Image-to-video generation"""
        try:
            content = [
                {
                    "type": "text",
                    "text": prompt
                }
            ]

            # Add images
            for url in image_urls:
                content.append({
                    "type": "image_url",
                    "image_url": {
                        "url": url
                    }
                })

            response = self.client.chat.completions.create(
                model=model,
                messages=[{
                    "role": "user",
                    "content": content
                }],
                stream=True
            )

            print(f"Starting video generation... (model: {model}, images: {len(image_urls)})")

            for chunk in response:
                if chunk.choices[0].delta.content:
                    content = chunk.choices[0].delta.content
                    print(f"Received data: {content}")

            print("Video generation complete!")

        except Exception as e:
            print(f"Error: {e}")

# Usage examples
if __name__ == "__main__":
    client = Veo31Client("sk-YOUR_API_KEY")

    # Example 1: Text-to-video
    print("=== Example 1: Text-to-Video ===")
    client.generate_video_from_text(
        prompt="Generate a video of a cute kitten playing on the grass",
        model="veo-3.1",
        n=2
    )

    # Example 2: Image-to-video
    print("\n=== Example 2: Image-to-Video ===")
    client.generate_video_from_images(
        prompt="Generate a smooth transition video based on two images",
        image_urls=[
            "https://example.com/start.jpg",
            "https://example.com/end.jpg"
        ],
        model="veo-3.1-fl"
    )

Using Base64 Images

import base64
from openai import OpenAI

def encode_image_to_base64(image_path):
    """Encode local image to base64"""
    with open(image_path, "rb") as image_file:
        return base64.b64encode(image_file.read()).decode('utf-8')

client = OpenAI(
    api_key="sk-YOUR_API_KEY",
    base_url="https://api.laozhang.ai/v1"
)

# Read local images
image1_base64 = encode_image_to_base64("./images/start.jpg")
image2_base64 = encode_image_to_base64("./images/end.jpg")

response = client.chat.completions.create(
    model="veo-3.1-fl",
    messages=[{
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "Generate transition animation based on these two images"
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": f"data:image/jpeg;base64,{image1_base64}"
                }
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": f"data:image/jpeg;base64,{image2_base64}"
                }
            }
        ]
    }],
    stream=True
)

for chunk in response:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end='', flush=True)

Node.js Complete Example

Install Dependencies

npm install openai

TypeScript Complete Implementation

import OpenAI from 'openai';
import * as fs from 'fs';

class Veo31Client {
  private client: OpenAI;

  constructor(apiKey: string) {
    this.client = new OpenAI({
      apiKey: apiKey,
      baseURL: 'https://api.laozhang.ai/v1'
    });
  }

  async generateVideoFromText(
    prompt: string,
    model: string = 'veo-3.1',
    n: number = 1
  ): Promise<void> {
    try {
      const stream = await this.client.chat.completions.create({
        model: model,
        messages: [{
          role: 'user',
          content: [
            {
              type: 'text',
              text: prompt
            }
          ]
        }],
        stream: true,
        n: n
      });

      console.log(`Starting video generation... (model: ${model})`);

      for await (const chunk of stream) {
        const content = chunk.choices[0]?.delta?.content;
        if (content) {
          console.log(`Received data: ${content}`);
        }
      }

      console.log('Video generation complete!');

    } catch (error) {
      console.error('Error:', error);
    }
  }

  async generateVideoFromImages(
    prompt: string,
    imageUrls: string[],
    model: string = 'veo-3.1-fl'
  ): Promise<void> {
    try {
      const content: any[] = [
        {
          type: 'text',
          text: prompt
        }
      ];

      // Add images
      for (const url of imageUrls) {
        content.push({
          type: 'image_url',
          image_url: {
            url: url
          }
        });
      }

      const stream = await this.client.chat.completions.create({
        model: model,
        messages: [{
          role: 'user',
          content: content
        }],
        stream: true
      });

      console.log(`Starting video generation... (model: ${model}, images: ${imageUrls.length})`);

      for await (const chunk of stream) {
        const content = chunk.choices[0]?.delta?.content;
        if (content) {
          console.log(`Received data: ${content}`);
        }
      }

      console.log('Video generation complete!');

    } catch (error) {
      console.error('Error:', error);
    }
  }

  encodeImageToBase64(imagePath: string): string {
    const imageBuffer = fs.readFileSync(imagePath);
    return imageBuffer.toString('base64');
  }
}

// Usage examples
async function main() {
  const client = new Veo31Client('sk-YOUR_API_KEY');

  // Example 1: Text-to-video
  console.log('=== Example 1: Text-to-Video ===');
  await client.generateVideoFromText(
    'Generate a romantic sunset scene by the sea',
    'veo-3.1',
    2
  );

  // Example 2: Image-to-video
  console.log('\n=== Example 2: Image-to-Video ===');
  await client.generateVideoFromImages(
    'Generate smooth transition animation based on these two images',
    [
      'https://example.com/image1.jpg',
      'https://example.com/image2.jpg'
    ],
    'veo-3.1-fl'
  );
}

main().catch(console.error);

JavaScript Simplified Version

const OpenAI = require('openai');

const client = new OpenAI({
  apiKey: 'sk-YOUR_API_KEY',
  baseURL: 'https://api.laozhang.ai/v1'
});

async function generateVideo() {
  const stream = await client.chat.completions.create({
    model: 'veo-3.1-fast',
    messages: [{
      role: 'user',
      content: [
        {
          type: 'text',
          text: 'Generate a video of a cat walking in the rain'
        }
      ]
    }],
    stream: true,
    n: 1
  });

  for await (const chunk of stream) {
    const content = chunk.choices[0]?.delta?.content;
    if (content) {
      process.stdout.write(content);
    }
  }
}

generateVideo().catch(console.error);

cURL Examples

Text-to-Video

curl --location --request POST 'https://api.laozhang.ai/v1/chat/completions' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer sk-YOUR_API_KEY' \
--data-raw '{
    "messages": [{
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "Generate a video of two cats and a dog fighting"
            }
        ]
    }],
    "model": "veo-3.1",
    "stream": true,
    "n": 2
}'

Image-to-Video (URL)

curl --location --request POST 'https://api.laozhang.ai/v1/chat/completions' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer sk-YOUR_API_KEY' \
--data-raw '{
    "messages": [{
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "Generate a complete transition video based on two images"
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": "https://example.com/start-frame.jpg"
                }
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": "https://example.com/end-frame.jpg"
                }
            }
        ]
    }],
    "model": "veo-3.1-fl",
    "stream": true,
    "n": 1
}'

Image-to-Video (Base64)

curl --location --request POST 'https://api.laozhang.ai/v1/chat/completions' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer sk-YOUR_API_KEY' \
--data-raw '{
    "messages": [{
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "Generate animation based on image"
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": "data:image/jpeg;base64,/9j/4AAQSkZJRg..."
                }
            }
        ]
    }],
    "model": "veo-3.1-landscape",
    "stream": true
}'

Go Example

package main

import (
    "context"
    "fmt"
    "io"
    "os"

    "github.com/sashabaranov/go-openai"
)

func main() {
    config := openai.DefaultConfig("sk-YOUR_API_KEY")
    config.BaseURL = "https://api.laozhang.ai/v1"
    client := openai.NewClientWithConfig(config)

    req := openai.ChatCompletionRequest{
        Model: "veo-3.1",
        Messages: []openai.ChatCompletionMessage{
            {
                Role: openai.ChatMessageRoleUser,
                MultiContent: []openai.ChatMessagePart{
                    {
                        Type: openai.ChatMessagePartTypeText,
                        Text: "Generate a video of a cute kitten playing with a ball of yarn",
                    },
                },
            },
        },
        Stream: true,
        N:      1,
    }

    stream, err := client.CreateChatCompletionStream(context.Background(), req)
    if err != nil {
        fmt.Printf("Stream error: %v\n", err)
        return
    }
    defer stream.Close()

    fmt.Println("Starting video generation...")
    for {
        response, err := stream.Recv()
        if err == io.EOF {
            fmt.Println("\nVideo generation complete!")
            break
        }
        if err != nil {
            fmt.Printf("Stream error: %v\n", err)
            return
        }

        if len(response.Choices) > 0 {
            content := response.Choices[0].Delta.Content
            if content != "" {
                fmt.Print(content)
            }
        }
    }
}

Image-to-Video Go Example

package main

import (
    "context"
    "encoding/base64"
    "fmt"
    "io"
    "os"

    "github.com/sashabaranov/go-openai"
)

func encodeImageToBase64(imagePath string) (string, error) {
    imageData, err := os.ReadFile(imagePath)
    if err != nil {
        return "", err
    }
    return base64.StdEncoding.EncodeToString(imageData), nil
}

func main() {
    config := openai.DefaultConfig("sk-YOUR_API_KEY")
    config.BaseURL = "https://api.laozhang.ai/v1"
    client := openai.NewClientWithConfig(config)

    // Encode images
    image1Base64, _ := encodeImageToBase64("./start.jpg")
    image2Base64, _ := encodeImageToBase64("./end.jpg")

    req := openai.ChatCompletionRequest{
        Model: "veo-3.1-fl",
        Messages: []openai.ChatCompletionMessage{
            {
                Role: openai.ChatMessageRoleUser,
                MultiContent: []openai.ChatMessagePart{
                    {
                        Type: openai.ChatMessagePartTypeText,
                        Text: "Generate transition video based on these two images",
                    },
                    {
                        Type: openai.ChatMessagePartTypeImageURL,
                        ImageURL: &openai.ChatMessageImageURL{
                            URL: fmt.Sprintf("data:image/jpeg;base64,%s", image1Base64),
                        },
                    },
                    {
                        Type: openai.ChatMessagePartTypeImageURL,
                        ImageURL: &openai.ChatMessageImageURL{
                            URL: fmt.Sprintf("data:image/jpeg;base64,%s", image2Base64),
                        },
                    },
                },
            },
        },
        Stream: true,
    }

    stream, err := client.CreateChatCompletionStream(context.Background(), req)
    if err != nil {
        fmt.Printf("Error: %v\n", err)
        return
    }
    defer stream.Close()

    fmt.Println("Starting video generation...")
    for {
        response, err := stream.Recv()
        if err == io.EOF {
            fmt.Println("\nComplete!")
            break
        }
        if err != nil {
            fmt.Printf("Error: %v\n", err)
            return
        }

        if len(response.Choices) > 0 {
            fmt.Print(response.Choices[0].Delta.Content)
        }
    }
}

Java Example

Using OkHttp

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import okhttp3.*;
import okio.BufferedSource;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class Veo31Client {
    private final OkHttpClient client;
    private final String apiKey;
    private final Gson gson;
    private static final String BASE_URL = "https://api.laozhang.ai/v1";

    public Veo31Client(String apiKey) {
        this.apiKey = apiKey;
        this.client = new OkHttpClient.Builder()
                .connectTimeout(30, TimeUnit.SECONDS)
                .readTimeout(60, TimeUnit.SECONDS)
                .build();
        this.gson = new Gson();
    }

    public void generateVideoFromText(String prompt, String model, int n) throws IOException {
        Map<String, Object> content = new HashMap<>();
        content.put("type", "text");
        content.put("text", prompt);

        List<Map<String, Object>> contents = new ArrayList<>();
        contents.add(content);

        Map<String, Object> message = new HashMap<>();
        message.put("role", "user");
        message.put("content", contents);

        List<Map<String, Object>> messages = new ArrayList<>();
        messages.add(message);

        Map<String, Object> requestBody = new HashMap<>();
        requestBody.put("model", model);
        requestBody.put("messages", messages);
        requestBody.put("stream", true);
        requestBody.put("n", n);

        String json = gson.toJson(requestBody);

        Request request = new Request.Builder()
                .url(BASE_URL + "/chat/completions")
                .post(RequestBody.create(json, MediaType.parse("application/json")))
                .addHeader("Authorization", "Bearer " + apiKey)
                .addHeader("Content-Type", "application/json")
                .build();

        try (Response response = client.newCall(request).execute()) {
            if (!response.isSuccessful()) {
                throw new IOException("Request failed: " + response);
            }

            System.out.println("Starting video generation...");

            BufferedSource source = response.body().source();
            while (!source.exhausted()) {
                String line = source.readUtf8Line();
                if (line != null && line.startsWith("data: ")) {
                    String data = line.substring(6);
                    if (!data.equals("[DONE]")) {
                        System.out.print(data);
                    }
                }
            }

            System.out.println("\nVideo generation complete!");
        }
    }

    public static void main(String[] args) throws IOException {
        Veo31Client client = new Veo31Client("sk-YOUR_API_KEY");

        // Generate video
        client.generateVideoFromText(
            "Generate a video of a cute panda playing in a bamboo forest",
            "veo-3.1",
            1
        );
    }
}

Response Format

Streaming Response Example

data: {"id":"chatcmpl-xxx","object":"chat.completion.chunk","created":1234567890,"model":"veo-3.1","choices":[{"index":0,"delta":{"content":"Video generating..."},"finish_reason":null}]}

data: {"id":"chatcmpl-xxx","object":"chat.completion.chunk","created":1234567890,"model":"veo-3.1","choices":[{"index":0,"delta":{"content":"Video URL: https://..."},"finish_reason":"stop"}]}

data: [DONE]

Advanced Usage

Batch Generate Multiple Results

from openai import OpenAI

client = OpenAI(
    api_key="sk-YOUR_API_KEY",
    base_url="https://api.laozhang.ai/v1"
)

response = client.chat.completions.create(
    model="veo-3.1-fast",
    messages=[{
        "role": "user",
        "content": [{"type": "text", "text": "Generate a sunset scene"}]
    }],
    stream=True,
    n=4  # Generate 4 different videos simultaneously
)

for chunk in response:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content)

Compare Different Models

models = [
    "veo-3.1",
    "veo-3.1-fast",
    "veo-3.1-fl",
    "veo-3.1-landscape"
]

prompt = "Generate a beautiful mountain landscape video"

for model in models:
    print(f"\n=== Testing model: {model} ===")
    response = client.chat.completions.create(
        model=model,
        messages=[{
            "role": "user",
            "content": [{"type": "text", "text": prompt}]
        }],
        stream=True
    )

    for chunk in response:
        if chunk.choices[0].delta.content:
            print(chunk.choices[0].delta.content, end='')

Getting Started

Core API

Video Generation APIs

Image Generation APIs

AI Understanding

Veo-3.1 Code Examples

Python Complete Example

Using OpenAI SDK

Complete Text-to-Video Example

Using Base64 Images

Node.js Complete Example

Install Dependencies

TypeScript Complete Implementation

JavaScript Simplified Version

cURL Examples

Text-to-Video

Image-to-Video (URL)

Image-to-Video (Base64)

Go Example

Image-to-Video Go Example

Java Example

Using OkHttp

Response Format

Streaming Response Example

Advanced Usage

Batch Generate Multiple Results

Compare Different Models

Next Steps

Best Practices

Troubleshooting

Getting Started

Core API

Video Generation APIs

Image Generation APIs

AI Understanding

​Python Complete Example

​Using OpenAI SDK

​Complete Text-to-Video Example

​Using Base64 Images

​Node.js Complete Example

​Install Dependencies

​TypeScript Complete Implementation

​JavaScript Simplified Version

​cURL Examples

​Text-to-Video

​Image-to-Video (URL)

​Image-to-Video (Base64)

​Go Example

​Image-to-Video Go Example

​Java Example

​Using OkHttp

​Response Format

​Streaming Response Example

​Advanced Usage

​Batch Generate Multiple Results

​Compare Different Models

​Next Steps

Best Practices

Troubleshooting

Python Complete Example

Using OpenAI SDK

Complete Text-to-Video Example

Using Base64 Images

Node.js Complete Example

Install Dependencies

TypeScript Complete Implementation

JavaScript Simplified Version

cURL Examples

Text-to-Video

Image-to-Video (URL)

Image-to-Video (Base64)

Go Example

Image-to-Video Go Example

Java Example

Using OkHttp

Response Format

Streaming Response Example

Advanced Usage

Batch Generate Multiple Results

Compare Different Models

Next Steps