首页指南参考教程
This is documentation for the next SDK version. For up-to-date documentation, see the latest version (SDK 51).

Expo VideoThumbnails

A library that allows you to generate an image to serve as a thumbnail from a video file.

Android
iOS

expo-video-thumbnails allows you to generate an image to serve as a thumbnail from a video file.

Installation

Terminal
npx expo install expo-video-thumbnails

If you are installing this in an existing React Native app (bare workflow), start by installing expo in your project. Then, follow the additional instructions as mentioned by library's README under "Installation in bare React Native projects" section.

Usage

Video Thumbnails
import React, { useState } from 'react';
import { StyleSheet, Button, View, Image, Text } from 'react-native';
import * as VideoThumbnails from 'expo-video-thumbnails';

export default function App() {
  const [image, setImage] = useState(null);

  const generateThumbnail = async () => {
    try {
      const { uri } = await VideoThumbnails.getThumbnailAsync(
        'https://d23dyxeqlo5psv.cloudfront.net/big_buck_bunny.mp4',
        {
          time: 15000,
        }
      );
      setImage(uri);
    } catch (e) {
      console.warn(e);
    }
  };

  return (
    <View style={styles.container}>
      <Button onPress={generateThumbnail} title="Generate thumbnail" />
      {image && <Image source={{ uri: image }} style={styles.image} />}
      <Text>{image}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  image: {
    width: 200,
    height: 200,
  },
});

API

import * as VideoThumbnails from 'expo-video-thumbnails';

Methods

Android
iOS

VideoThumbnails.getThumbnailAsync(sourceFilename, options)

NameTypeDescription
sourceFilenamestring

An URI of the video, local or remote.

options
(optional)
VideoThumbnailsOptions

A map defining how modified thumbnail should be created.

Default: {}

Create an image thumbnail from video provided via sourceFilename.

Returns:

Promise<VideoThumbnailsResult>

Returns a promise which fulfils with VideoThumbnailsResult.

Types

Android
iOS

VideoThumbnailsOptions

NameTypeDescription
headers
(optional)
Record<string, string>

In case sourceFilename is a remote URI, headers object is passed in a network request.

quality
(optional)
number

A value in range 0.0 - 1.0 specifying quality level of the result image. 1 means no compression (highest quality) and 0 the highest compression (lowest quality).

time
(optional)
number

The time position where the image will be retrieved in ms.

Android
iOS

VideoThumbnailsResult

NameTypeDescription
heightnumber

Height of the created image.

uristring

URI to the created image (usable as the source for an Image/Video element).

widthnumber

Width of the created image.

Expo 中文网 - 粤ICP备13048890号