播放video时，avplayer没有声音

这是我的所有代码播放mp4，mp4播放但没有声音

import UIKit import AVFoundation class ViewController: UIViewController { @IBOutlet weak var containerView: UIView! var playerLayer:AVPlayerLayer! var player:AVPlayer! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. let path = NSBundle.mainBundle().pathForResource("huoguo", ofType: "mp4") let url = NSURL(fileURLWithPath: path!) let asset = AVAsset(URL: url) let playerItem = AVPlayerItem(asset: asset) self.player = AVPlayer(playerItem: playerItem) self.playerLayer = AVPlayerLayer(player: player) self.playerLayer.frame = CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.width * 9 / 16) self.containerView.layer.addSublayer(playerLayer) //self.playerLayer.player?.volume = 1 self.playerLayer.player?.play() } } 

我确定它有声音，因为我可以听到使用VLC播放mp4时，我是否想念一些东西？

Answer 1

检查手机是否处于静音模式。 如果它是静默的，请尝试将以下代码添加到viewDidLoad ：

斯威夫特2.3

 try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, withOptions: []) 

斯威夫特3

 try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: [])