AVPlayer 设置 fps

Question

嗨，我是经典播放器

var player = AVPlayer(url: fileUrl)
player.play()

可以设置播放器的FPS吗？例如，我想以 30fps

播放慢动作视频 (240fps)

我试试

player.play()
player.rate = 0.5

但这只能以 120fps 的速度播放 240fps 的视频。

可以在视频播放期间更改 FPS

let timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: false) {_ in
        player.rate = 0.5
}

效果很好，但不能像上面那样设置 30FPS

谢谢！！

Answer 1

如果我理解正确的话，你只是想放慢内容，所以设置速率是正确的方法（你也可以在内容播放时这样做）。

如果你想从 240 到 30 fps，这意味着你想将速率设置为 30/240，这意味着 1/8。

所以应该这样做：

player.rate = Float(1)/Float(8)

您还应该将 playerItem audioPitchAlgorithm 设置为 lowQualityZeroLatency 以外的值，以允许它低于 0.5 直到 1/32

lowQualityZeroLatency

This algorithm is suitable for brief fast-forward and rewind effects as well as low quality voice. The rate is snapped to {0.5, 0.666667, 0.8, 1.0, 1.25, 1.5, 2.0}.

我测试正确的这个片段达到了速度的1/8。

let playerItem = AVPlayerItem(url: URL(string:"https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_ts/master.m3u8")!)
playerItem.audioTimePitchAlgorithm = .varispeed
let avPlayer = AVPlayer(playerItem: playerItem)

let vc = AVPlayerViewController()
vc.player = avPlayer

avPlayer.rate = 0.125
self.present(vc, animated: true)

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