swift - AVPlayer 在 iOS 15.4 中寻求 completionHandler 返回 false

Question

我们正尝试在我们的 SwiftUI 应用程序中实现 AVPlayer seek，它在 iOS 15.4 之前有效，但在更新之后无效。

let playerCurrentTime = CMTimeGetSeconds(player.currentTime())
let newTime = playerCurrentTime + 45
let time2: CMTime = CMTimeMake(value: Int64(newTime * 1000 as Float64), timescale: 1000)
player.seek(to: time2, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero) { success in
   print(success)
}

completionHandler 被立即调用，success = false。没有其他搜索操作正在运行，并且 AVPlayer 状态为 readyToPlay。

我们使用以下初始化代码从 URL 流式传输 MP3 文件:

playerItem = AVPlayerItem(url: url)
        
player = AVPlayer(playerItem: playerItem)
player.addPeriodicTimeObserver(forInterval: CMTime(value: 1, timescale: 2), queue: DispatchQueue.main) { _ in
        if self.player.currentItem?.status == .readyToPlay {
            self.currentTimeInSeconds = CMTimeGetSeconds(self.player.currentTime())
            self.progressInPct = Double(self.currentTimeInSeconds) / Double(self.totalTimeInSeconds)
            self.nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = 1
            MPNowPlayingInfoCenter.default().nowPlayingInfo = self.nowPlayingInfo
                self.setupNowPlaying()
        } else {
            self.nowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = 0
            MPNowPlayingInfoCenter.default().nowPlayingInfo = self.nowPlayingInfo
        }
}

我们也尝试在 currentItem 上寻找，但这也没有用。

player.currentItem?.seek(to: time, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero)

有没有人遇到过这样的事情，有什么指点吗？

更新:尝试进行完整的简单尝试，但结果仍然相同:

struct testView: View {
    var player = AVPlayer()

    var body: some View {
        Button {
            self.startPlayer(url: episode.streamUrl!)
        }
        label: {
            Text("Test")
        }
    }
    func startPlayer(url: String) {
        let playerItem = AVPlayerItem(url: URL(string: url) !)
        self.player.replaceCurrentItem(with: playerItem)
        player.play()

        DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
            let time2: CMTime = CMTimeMake(value: Int64(45 * 1000 as Float64), timescale: 1000)
            player.seek(to: time2, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero) {
                success in
                    print(success)
            }
        }
    }
}

打印“假”。

Answer 1

为了进行比较，我附上了一段用于时间观察和 3 种搜索功能的代码。到目前为止，它在 iOS 15.4 上运行良好(尽管在 UIKit 和 .m3u8 播放列表上)。希望它能以某种方式帮助您。

1. 求函数:

   func seek1() {
    let videoDuration = (avPlayer.currentItem?.duration.seconds ?? 0)!
    let elapsedTime: Float64 = videoDuration * Float64(archiveControlsView.seekSlider.value)
    let toTime = CMTime.init(seconds: elapsedTime,
                             preferredTimescale: 100)
    avPlayer.seek(to: toTime,completionHandler: { (completed: Bool) -> Void in
        //do whatever you need
    })
   }
   
   func seek2() {
    let diff: TimeInterval = 60
    self.avPlayer.seek(to: CMTime.init(seconds: diff,   preferredTimescale: 100))
   }
   
   func seekToZero() {
    self.avPlayer.seek(to: kCMTimeZero)
   }
   

2. 时间观察函数

   var timeObserver: AnyObject!
   
   func createTimer() {
    let timeInterval: CMTime = CMTime.init(seconds: 1.0, preferredTimescale: 10)
   
    timeObserver = avPlayer.addPeriodicTimeObserver(forInterval: timeInterval,
                                                    queue: DispatchQueue.main) {
        (elapsedTime: CMTime) -> Void in
   
        guard self.status != .Seeking else { return }
        self.observeTime(elapsedTime)
        let duration = (self.avPlayer.currentItem?.duration.seconds ?? 0)!
        let elapsedTime = elapsedTime.seconds
        // do whatever you need with elapsed and duration
    } as AnyObject?
   }