在原生脚本应用程序中将PHAsset/AVAsset转换为mp4视频

import Photos
import AVFoundation

func convertPHAssetToMP4(asset: PHAsset, completion: @escaping (URL?, Error?) -> Void) {
    let options = PHVideoRequestOptions()
    options.version = .original
    
    PHImageManager.default().requestAVAsset(forVideo: asset, options: options) { (avAsset, _, _) in
        guard let avAsset = avAsset as? AVURLAsset else {
            completion(nil, NSError(domain: "ConversionError", code: 0, userInfo: nil))
            return
        }
        
        let exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough)
        let outputURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("output.mp4")
        
        exportSession?.outputURL = outputURL
        exportSession?.outputFileType = .mp4
        
        exportSession?.exportAsynchronously {
            if exportSession?.status == .completed {
                completion(outputURL, nil)
            } else {
                completion(nil, exportSession?.error)
            }
        }
    }
}