Member-only story
How to change the play speed rate on AVPlayer (swift)
When you play audio with the AVPlayer, you would use this
player = AVPlayer.init(playerItem: playerItem)
player?.play()There a specific property to calibrate the audio play speed rate. You can use the ‘rate’ property.
player = AVPlayer.init(playerItem: playerItem)
player?.rate = 0.7
player?.play()But, in this case, it doesn’t work. You have to place after “.play()”
player = AVPlayer.init(playerItem: playerItem)
player?.play()
player?.rate = 0.7After this, you play the sound, and you are able to recognize it’s not really okay. Because the sound is nasty. and You can hear the broken frame
You should set the “audioTimePitchAlgorithm” property manually.
player = AVPlayer.init(playerItem: playerItem)
player?.currentItem?.audioTimePitchAlgorithm = .timeDomainplayer?.play()
player?.rate = 0.7
audioTimePitchAlgorithm has four different options.
Type Properties
static let lowQualityZeroLatency: AVAudioTimePitchAlgorithmLow quality and very low computationally intensive pitch algorithm.
static let spectral: AVAudioTimePitchAlgorithmThe highest quality, most computationally expensive pitch algorithm.
static let timeDomain: AVAudioTimePitchAlgorithmA modest quality pitch algorithm that is less computationally intensive than the spectral algorithm.
static let varispeed: AVAudioTimePitchAlgorithmA high quality, no pitch correction algorithm.
Here is the comparison video.
As you can see, the only available option is just using ‘timeDomain’
