ios - AVPlayer HLS 直播流 IOS

Question

我正在尝试使用 HLS 进行直播，但出现错误:

error: Optional("The operation could not be completed"), error: Optional(Error Domain=AVFoundationErrorDomain Code=-11800 "Media format - sample description is invalid (e.g. invalid size)" UserInfo={NSUnderlyingError=0x60000005b510 {Error Domain=NSOSStatusErrorDomain Code=-12714 "(null)"}, NSLocalizedFailureReason=An unknown error occurred (-12714), NSDebugDescription=Media format - sample description is invalid (e.g. invalid size), NSLocalizedDescription=The operation could not be completed}) 2018-04-25 12:14:51.608117+0200 morethen2[11681:374192] Task .<3> finished with error - code: -999

我无法共享流链接，它是私有(private)的。

代码如下:

class ViewController: UIViewController {

var player = AVPlayer()

override func viewDidLoad() {
    super.viewDidLoad()
    let url = URL(string: "https:can-t-share-it/LIVE-008900021A-LIP-0-channelNo2_360p/manifest.m3u8")!

    let asset = AVURLAsset(url: url)

    let playerItem = AVPlayerItem(asset: asset)

    player = AVPlayer(url: url)
    let layer = AVPlayerLayer(player: player)
    layer.frame = view.layer.frame
    view.layer.addSublayer(layer)


    self.player.addObserver(self, forKeyPath: #keyPath(AVPlayer.status), options: [.new, .initial], context: nil)
    self.player.addObserver(self, forKeyPath: #keyPath(AVPlayer.currentItem.status), options:[.new, .initial], context: nil)

    // Watch notifications
    let center = NotificationCenter.default
    center.addObserver(self, selector:"newErrorLogEntry:", name: .AVPlayerItemNewErrorLogEntry, object: player.currentItem)
    center.addObserver(self, selector:"failedToPlayToEndTime:", name: .AVPlayerItemFailedToPlayToEndTime, object: player.currentItem)


    player.play()

    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func dismiss(_ sender: Any) {
    UIApplication.shared.keyWindow?.rootViewController?.dismiss(animated: true, completion: nil)
}


// Observe If AVPlayerItem.status Changed to Fail
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) {
    if let player = object as? AVPlayer, keyPath == #keyPath(AVPlayer.currentItem.status) {
        let newStatus: AVPlayerItemStatus
        if let newStatusAsNumber = change?[NSKeyValueChangeKey.newKey] as? NSNumber {
            newStatus = AVPlayerItemStatus(rawValue: newStatusAsNumber.intValue)!
        } else {
            newStatus = .unknown
        }
        if newStatus == .failed {
            NSLog("Error: \(String(describing: player.currentItem?.error?.localizedDescription)), error: \(String(describing: player.currentItem?.error))")
        }
    }
}

// Getting error from Notification payload
func newErrorLogEntry(_ notification: Notification) {
    guard let object = notification.object, let playerItem = object as? AVPlayerItem else {
        return
    }
    guard let errorLog: AVPlayerItemErrorLog = playerItem.errorLog() else {
        return
    }
    NSLog("Error: \(errorLog)")
}

func failedToPlayToEndTime(_ notification: Notification) {
    let error = notification.userInfo!["AVPlayerItemFailedToPlayToEndTimeErrorKey"]
    NSLog("error: \(error)")
} }

这是视频细节:

同样的流也适用于 Android 应用程序和网络

Answer 1

我在这里留下我的答案以防其他人需要它。经过研究、尝试和错误，我终于找到了让 AVPlayer 与 NGINX rtmp hls 一起工作的方法。

发生这种情况的主要原因是服务器上的视频片段元数据错误。我们必须找到解决这个问题的方法。

这是我从我的 macbook 上传视频的命令，这是典型的:

ffmpeg -f avfoundation -framerate 30  -i "0:0" -f flv -s 360x240 -vcodec libx264 -c:a aac -async 1 -vsync 1 -preset slower rtmp://127.0.0.1/live/xyz

在服务器端，我在 Ubuntu 18.10 上配置了一个基本的 Nginx RTMP HLS，这可以通过谷歌搜索找到。请注意，我使用 fdk_aac 重新编译了最新的 ffmpeg。

RTMP 有 2 个应用程序:一个用于接收上行，另一个用于转码 HLS，这也是典型的。

为了解决元数据问题，我通过添加以下内容调整了带有基线配置文件的 ffmpeg 转码命令:-profile:v baseline -level 3.0。这样会因为颜色格式错误导致错误，所以我还加了:-vf "scale=480:trunc(ow/a/2)*2,format=yuv420p".

最后，我的 nginx 配置起作用了: https://gist.github.com/chung-nguyen/d88e73e3cc8788878f5ffb8c232b4729

还有我的 AVPlayer 代码:

    let videoURL = URL(string: "http://blogchange.live/hls/xyz_low/index.m3u8")

    let playerItem = AVPlayerItem(url: videoURL!)
    let adID = AVMetadataItem.identifier(forKey: "X-TITLE", keySpace: .hlsDateRange)
    let metadataCollector = AVPlayerItemMetadataCollector(identifiers: [adID!.rawValue], classifyingLabels: nil)
    metadataCollector.setDelegate(self, queue: DispatchQueue.main)
    playerItem.add(metadataCollector)


    let player = AVPlayer(playerItem: playerItem)
    let playerLayer = AVPlayerLayer(player: player)
    playerLayer.frame = self.view.bounds
    self.view.layer.addSublayer(playerLayer)
    self.player = player
    player.play()