iPhone使用AVFoundation从视频中读取UIimage(帧)

import AVFoundation

func extractFramesFromVideo(videoURL: URL) -> [UIImage]? {
    let asset = AVAsset(url: videoURL)
    let imageGenerator = AVAssetImageGenerator(asset: asset)
    imageGenerator.appliesPreferredTrackTransform = true
    
    var frames: [UIImage] = []
    
    do {
        let duration = asset.duration
        let durationSeconds = CMTimeGetSeconds(duration)
        
        for time in stride(from: 0.0, to: durationSeconds, by: 1.0) {
            let time = CMTime(seconds: time, preferredTimescale: 600)
            if let cgImage = try imageGenerator.copyCGImage(at: time, actualTime: nil) {
                let image = UIImage(cgImage: cgImage)
                frames.append(image)
            }
        }
    } catch {
        print("Error extracting frames from video: \(error)")
        return nil
    }
    
    return frames
}

// 使用示例
if let videoURL = Bundle.main.url(forResource: "example", withExtension: "mp4") {
    if let frames = extractFramesFromVideo(videoURL: videoURL) {
        // 处理获取到的每一帧图片
        for frame in frames {
            // 进行相关操作
        }
    }
}