如何通过 AVPlayer 以 2.0 速率播放带音频的视频 iOS

Question

我正在 iOS 上制作视频播放器。我想要以 2.0 播放速度播放视频的功能。但是当我设置rate 2.0时，视频可以播放但是这里没有声音。请帮助我并告诉我我做错了什么。下面是我的代码：

        let url = URL(string: self.url)

        let asset = AVAsset(url: url!)

        if (!asset.isPlayable) {
            print (self.url + " cannot to play.")
            return

        }

        let playItem = AVPlayerItem(asset: asset)
        playItem.audioTimePitchAlgorithm = AVAudioTimePitchAlgorithm.lowQualityZeroLatency
        self.player = MyAVPlayer(playerItem: playItem)

        self.playerViewController = AVPlayerViewController()
        self.playerViewController?.player = self.player
        self.player?.allowsExternalPlayback = true

        // self.playerViewController?.showsPlaybackControls = self.showControl

        if (self.autoPlay) {
           // player?.play()
            player?.play()
            player?.rate = 2.0
        }

Answer 1

经过一个月的研究，我找到了解决方案。其实很简单，把2.0换成1.99。我认为 swift 将 2.0 转换为浮点值时会出现问题，转换后的值可能是 2.00000000003，大于 2.0 并且它不起作用。

如何通过 AVPlayer 以 2.0 速率播放带音频的视频 iOS

How to play video at rate 2.0 with audio via AVPlayer iOS

ios

avplayer

swift