ios - NSURLErrorDomain error -1 尝试下载 http Live Streaming Video 时

Question

我一直在尝试使用 AVAssetDownloadDelegate 从 url 下载视频。我可以播放响应中的视频，但无法使用以下代码下载媒体。

我收到此错误“操作无法完成。(NSURLErrorDomain 错误 -1。)”

这是我使用的代码

@IBOutlet weak var view1: UIView!

var configuration : URLSessionConfiguration? = nil

var downloadSession : AVAssetDownloadURLSession? = nil

override func viewDidLoad() {
    super.viewDidLoad()


      configuration = URLSessionConfiguration.background(withIdentifier: "downloadIdentifier")


      downloadSession = AVAssetDownloadURLSession(configuration: configuration!,
                                                    assetDownloadDelegate: self,
                                                    delegateQueue: nil)

    let url = URL(string: "http://sample.vodobox.net/skate_phantom_flex_4k/skate_phantom_flex_4k.m3u8")
    let asset = AVURLAsset(url: url!)

    let downloadTask = downloadSession?.makeAssetDownloadTask(asset: asset,
                                                              assetTitle: "assetTitle",
                                                              assetArtworkData: nil,
                                                              options: nil)

    // Start task and begin download
    downloadTask?.resume()


    let playerItem = AVPlayerItem(asset: (downloadTask?.urlAsset)!)
    let player = AVPlayer(playerItem: playerItem)
    let playerLayer = AVPlayerLayer(player: player)
    playerLayer.frame = view1.bounds
    view1.layer.addSublayer(playerLayer)
    player.play()


}

这是我实现的代表

func urlSession(_ session: URLSession, assetDownloadTask: AVAssetDownloadTask, didFinishDownloadingTo location: URL) {
    print("Downloaded to Location : \(location)")
}



func urlSession(_ session: URLSession, assetDownloadTask: AVAssetDownloadTask, didLoad timeRange: CMTimeRange, totalTimeRangesLoaded loadedTimeRanges: [NSValue], timeRangeExpectedToLoad: CMTimeRange) {
    var percentComplete = 0.0
    // Iterate through the loaded time ranges
    for value in loadedTimeRanges {
        // Unwrap the CMTimeRange from the NSValue
        let loadedTimeRange = value.timeRangeValue
        // Calculate the percentage of the total expected asset duration
        percentComplete += loadedTimeRange.duration.seconds / timeRangeExpectedToLoad.duration.seconds
    }
    print(percentComplete *= 100)
    // Update UI state: post notification, update KVO state, invoke callback, etc.
}

func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {


    if (error != nil){

        print(error?.localizedDescription)



    }else{

        print("Error")

    }

}

请看这个..

Answer 1

这个 HLS 下载 API 在很多方面都被破坏了。您可以尝试的几件事:

1. 在 makeAssetDownloadTask 调用中指定比特率(选项参数)
2. 修改他们的示例应用程序以下载您的视频，这可以帮助您进行调试，看看您的播放列表是否有任何问题。
3. 实现 func urlSession(_ session: URLSession, assetDownloadTask: AVAssetDownloadTask, didResolve returned MediaSelection: AVMediaSelection) 委托(delegate)，看看它是否被调用。