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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | 7x 7x 7x 1x 7x 1x 1x 6x 4x 2x 2x 3x 3x 4x 4x 3x 3x | /**
* 视频缩略图生成工具
*
* 使用 expo-video-thumbnails 生成视频第一帧作为预览
*/
/**
* 生成视频缩略图
* @param videoUri 视频 URI
* @returns 缩略图 URI 或 null
*/
export async function generateVideoThumbnail(videoUri: string): Promise<string | null> {
try {
// 动态导入 expo-video-thumbnails，如果未安装则返回 null
// Use require instead of import() for better testability with Jest
let VideoThumbnails;
try {
VideoThumbnails = require('expo-video-thumbnails');
} catch (e) {
VideoThumbnails = null;
}
if (!VideoThumbnails) {
console.warn('expo-video-thumbnails 未安装，无法生成缩略图');
return null;
}
const { uri } = await VideoThumbnails.getThumbnailAsync(videoUri, {
time: 0, // 获取第一帧
quality: 0.7,
});
return uri;
} catch (error) {
console.error('生成视频缩略图失败:', error);
return null;
}
}
/**
* 批量生成视频缩略图
* @param videoUris 视频 URI 数组
* @returns 缩略图 URI 映射表
*/
export async function generateVideoThumbnails(videoUris: string[]): Promise<Map<string, string>> {
const thumbnailMap = new Map<string, string>();
await Promise.allSettled(
videoUris.map(async (uri) => {
const thumbnail = await generateVideoThumbnail(uri);
if (thumbnail) {
thumbnailMap.set(uri, thumbnail);
}
})
);
return thumbnailMap;
}
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