太多的 AVPlayer 导致 Terminated due to memory issue

Question

我有一个 vc，里面有一个 AVPlayer。从那个 vc 我可以推动一个不同的 vc 与另一个球员在里面，我可以继续推动更多 vcs 与他们里面的球员。在大约 14th vc 被推送后，应用程序崩溃 Terminated due to memory issue。

当我查看内存图（左窗格中的第 9 个图标）时，它大约为 70mb，因此内存中没有令人讨厌的跳跃。我所有的视频文件都保存到磁盘并从磁盘检索，每当我弹出 vc 我在 Deinit 中有一个打印语句 总是运行 所以没有'没有其他原因导致内存问题。这让我相信了其他 SO 答案，这些答案说同时存在 16 AVPlayers 的限制。我认为所有这些播放器导致此内存崩溃的原因是，一旦我注释掉播放器初始化代码，我就可以继续 30 vcs 而不会出现任何崩溃。

我正要在 viewWillDisappear/viewDidDisappear 中从父 vc 中完全删除播放器、playerItem、它的观察者和播放器层，然后在 [=16] 中弹出子项后再次重新初始化所有内容=] 但后来我发现 this blog 说

platform limitation on the number of video “render pipelines” shared between apps on the device. It turns out that setting the AVPlayer to nil does not free up a playback pipeline and that it is actually the association of a playerItem with a player that creates the pipeline in the first place

和这个 answer 说

It is not a limit on the number of instances of AVPlayer, or AVPlayerItem. Rather,it is the association of AVPlayerItem with an AVPlayer which creates a "render pipeline"

问题是当 pushing/popping 在新的 vc 上（里面会有一个播放器）我是否需要完全 remove/readd 与播放器相关的所有内容或将设置将 AVPlayerItem 更改为 nil 然后重新初始化它是否解决了问题？

如果 渲染管道 导致了问题，那么似乎限制不在播放器上，而是在播放器项目上。

代码：

override func viewDidLoad() {
    super.viewDidLoad()

    configurePlayer(with: self.videoUrl)
}

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

    // only runs when popping back
    if !isMovingToParent {

        // I can either
        let asset = AVAsset(url: selfvideoUrl)
        self.playerItem = AVPlayerItem(asset: asset)
        self.player?.replaceCurrentItem(with: playerItem!)

        // or just reinitialize everything
        configurePlayer(with: self.videoUrl)
    }
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    
    // would these 2 lines be enough suffice to prevent the issue?
    self.player?.replaceCurrentItem(with: nil)
    self.playerItem = nil

    // or do I also need to nil out everything?
    self.player = nil
    self.avPlayerView.removeFromSuperView()
    self.playerStatusObserver = nil
    self.playerRateObserver = nil
    self.playerTimeControlStatusObserver = nil
}


func configurePlayer(with videoUrl: URL) {

    let asset = AVAsset(url: videoUrl)
    self.playerItem = AVPlayerItem(asset: asset)

    self.player = AVPlayer()
    self.playerLayer = AVPlayerLayer(player: player)
    self.playerLayer?.videoGravity = AVLayerVideoGravity.resizeAspect
    self.player?.automaticallyWaitsToMinimizeStalling = false
    self.playerItem.preferredForwardBufferDuration = TimeInterval(1.0)

    view.addSubview(avPlayerView) // this is just a view with a CALayer for the playerLayer
    self.playerLayer?.frame = avPlayerView.bounds
    self.avPlayerView.layer.addSublayer(playerLayer!)
    self.avPlayerView.playerLayer = playerLayer

    self.player?.replaceCurrentItem(with: playerItem!)

    // add endTimeNotification

    setNSKeyValueObservers()
}

func setNSKeyValueObservers() {

    self.playerStatusObserver = player?.observe(\.currentItem?.status, options: [.new, .old]) {
        [weak self] (player, change) in ... }

    self.playerRateObserver = player?.observe(\.rate, options:  [.new, .old], changeHandler: { 
        [weak self](player, change) in ... }

    self.playerTimeControlStatusObserver = player?.observe(\.timeControlStatus, options: [.new, .old]) {
        [weak self](player, change) in ... }
}

Answer 1

我刚刚对其进行了测试，并将其设置为 nil 并重新初始化它，这让我能够在没有任何崩溃的情况下推送 30 个 vc，每个 vc 中都有一个 AVPlayer。

player?.replaceCurrentItem(with: nil)

所以问题不在于 AVPlayers 的总量，而是 this guy said、the association of AVPlayerItem with an AVPlayer which creates a "render pipeline 并且同时出现太多才是导致问题的原因。

override func viewDidLoad() {
    super.viewDidLoad()

    configurePlayer(with: self.videoUrl)
}


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

    if let playerItem = playerItem {
        self.player?.replaceCurrentItem(with: playerItem)
    }
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    
    self.player?.replaceCurrentItem(with: nil)
}

太多的 AVPlayer 导致 Terminated due to memory issue

Too many AVPlayers causes Terminated due to memory issue

ios

avplayer

swift

avplayeritem