39 lines
1.3 KiB
TypeScript
39 lines
1.3 KiB
TypeScript
import * as ImageManipulator from 'expo-image-manipulator';
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import * as VideoThumbnail from 'expo-video-thumbnails';
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export const extractVideoThumbnail = async (videoUri: string): Promise<{ uri: string; file: File }> => {
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try {
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// 获取视频的第一帧
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const { uri: thumbnailUri } = await VideoThumbnail.getThumbnailAsync(
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videoUri,
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{
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time: 1000, // 1秒的位置
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quality: 0.8,
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}
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);
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// 转换为 WebP 格式
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const manipResult = await ImageManipulator.manipulateAsync(
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thumbnailUri,
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[{ resize: { width: 800 } }], // 调整大小以提高性能
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{
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compress: 0.8,
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format: ImageManipulator.SaveFormat.WEBP
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}
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);
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// 转换为 File 对象
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const response = await fetch(manipResult.uri);
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const blob = await response.blob();
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const file = new File(
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[blob],
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`thumb_${Date.now()}.webp`,
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{ type: 'image/webp' }
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);
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return { uri: manipResult.uri, file };
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} catch (error) {
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console.error('Error generating video thumbnail:', error);
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throw new Error('无法生成视频缩略图: ' + (error instanceof Error ? error.message : String(error)));
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}
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}; |