向后播放视频(Play video backwards)

 我想要的基本上是反转AVAsset和输出视频文件，我发现这个链接 - https://github.com/tempire/ReverseAVAsset/blob/master/AVAsset.swift 
 
 这就是我所做的： 
 
import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    var playerViewController = AVPlayerViewController()
    var playerView = AVPlayer()


    override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)

         let path = Bundle.main.path(forResource: "video", ofType: "mov")
         let outputUrl = URL(fileURLWithPath: "\(NSUUID().uuidString)video.mov")

         let originalAsset = AVAsset(url: URL(fileURLWithPath: path!))
         let reversedAsset = originalAsset.reversedAsset(outputUrl)



         playerView = AVPlayer(playerItem: AVPlayerItem(asset: reversedAsset!))
         playerViewController.player = playerView

         present(playerViewController, animated: true) { 
             self.playerViewController.player?.play()
         }

    }


}
 
 但它不工作，这就是我最终的结果： 
 
  
 
 我想我对outputURL做错了，如果你知道该怎么做，请帮忙 

What I want is basically reverse an AVAsset and output video file and I found this link - https://github.com/tempire/ReverseAVAsset/blob/master/AVAsset.swift
 
This is what I did:
 
import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController {

    var playerViewController = AVPlayerViewController()
    var playerView = AVPlayer()


    override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)

         let path = Bundle.main.path(forResource: "video", ofType: "mov")
         let outputUrl = URL(fileURLWithPath: "\(NSUUID().uuidString)video.mov")

         let originalAsset = AVAsset(url: URL(fileURLWithPath: path!))
         let reversedAsset = originalAsset.reversedAsset(outputUrl)



         playerView = AVPlayer(playerItem: AVPlayerItem(asset: reversedAsset!))
         playerViewController.player = playerView

         present(playerViewController, animated: true) { 
             self.playerViewController.player?.play()
         }

    }


}
 
But its not working and this is what I end up with: 
 
 
I think I'm doing something wrong with outputURL, please help if you know what to do

原文：https://stackoverflow.com/questions/47617100