avplayer has no sounds when play video

Question

here is all my codes for play a mp4,the mp4 is playing but no sounds out

import UIKit

import AVFoundation
class ViewController: UIViewController {

@IBOutl         


        

Answer 1

For Swift 4.2, put following lines in viewDidLoad

do {
    try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
}
catch {
    print("Setting category to AVAudioSessionCategoryPlayback failed.")
}

Answer 2

Its working 100% please try this import AVKit , import AVFoundation and put below code in viewDidLoad() Method.

    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, mode: AVAudioSessionModeDefault, options: [])
    }
    catch {
        print("Setting category to AVAudioSessionCategoryPlayback failed.")
    }

Answer 3

Check if the iPhone has silent mode engaged, it is a button above the 2 top left buttons. A toggle switch that allows silent mode.

Answer 4

Check your phone is silent mode or not. If it is silent try add code below to viewDidLoad:

Swift 2.3

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

Swift 3

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

Swift 4.2

try! AVAudioSession.sharedInstance().setCategory(.playback, options: [])

Or just

try! AVAudioSession.sharedInstance().setCategory(.playback)

Answer 5

I had multiple view controllers that needed to play audio even when the device what set to mute. So instead of updating every single viewDidLoad, I added the following to the didFinishLaunchingWithOptions method in the AppDelegate.swift file.

try? AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)

Notes:

• import AVFoundation
• I didn't need any other error catching so I just used try?.
• I am supporting down to iOS 9. Gang Fang's answer required iOS 10. Only using the single parameter as I did above, though, worked fine for iOS 9.
• Tested with Swift 5