iOS - 录制一个 mp4 文件

Question

所以我想在录制时生成一个 mp4 文件，我能做的就是只生成 .m4a 或 .caf。当我尝试生成其他文件时失败使用此代码：

import AVFoundation

class ViewController: UIViewController {
var fileName: String = "audioFile.m4a"

var soundRecorder: AVAudioRecorder?
var soundPlayer: AVAudioPlayer?
var audioSession = AVAudioSession.sharedInstance()

override func viewDidLoad() {
    super.viewDidLoad()
    setUpRecorder()
    playBtn.isEnabled = false

}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    self.audioSession = AVAudioSession.sharedInstance()

    do {
        try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: .measurement, options: .defaultToSpeaker)
        try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
    } catch {
        print(error)
    }
}


func getDocDirector() -> URL {
    let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return path[0]
}

func setUpRecorder() {


    let audioFileName = getDocDirector().appendingPathComponent(fileName)
    let recordSettings = [ AVFormatIDKey: Int(kAudioFormatAppleLossless),
                           AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,
                           AVEncoderBitRateKey: 192000,
                           AVNumberOfChannelsKey: 1,
    AVSampleRateKey: 441000 ] as [String: Any]

    do {
        soundRecorder = try AVAudioRecorder(url: audioFileName, settings: recordSettings)
        soundRecorder?.delegate = self
        soundRecorder?.prepareToRecord()
    } catch {
       print(error)
    }
}

func setUpPlayer() {
    let audioFileName = getDocDirector().appendingPathComponent(fileName)
    do {
        soundPlayer = try AVAudioPlayer(contentsOf: audioFileName)
        soundPlayer?.delegate = self
        soundPlayer?.prepareToPlay()
        soundPlayer?.volume = 1.0
    } catch {
        print(error)
    }
}

@IBAction func recordAction(_ sender: Any) {
    if recordBtn.titleLabel?.text == "Record" {
        soundRecorder?.record()
        recordBtn.setTitle("Stop", for: .normal)
        playBtn.isEnabled = false
    } else {
        soundRecorder?.stop()
        recordBtn.setTitle("Record", for: .normal)
        playBtn.isEnabled = false
    }
}

@IBAction func playAction(_ sender: Any) {
    if playBtn.titleLabel?.text == "Play" {
        playBtn.setTitle("Stop", for: .normal)
        recordBtn.isEnabled = false
        setUpPlayer()
        soundPlayer?.play()
    } else {
        playBtn.setTitle("Play", for: .normal)
        recordBtn.isEnabled = false
    }
}

extension ViewController: AVAudioRecorderDelegate {
 func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
    playBtn.isEnabled = true
}

func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
    print(error!)
}
}

extension ViewController: AVAudioPlayerDelegate {  
 func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    recordBtn.isEnabled = true
    playBtn.setTitle("Play", for: .normal)
}
}

所有这一切都很好，但我无法找到编写 mp4 的方法有没有办法直接写mp4？我的最终目标是生成碎片化的 mp4 以通过套接字发送... 很高兴得到建议

Answer 1

将您的设置字典更改为这个：

let recordSettings: [String: Any] = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                                         AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,
                                         AVNumberOfChannelsKey: 1,
                                         AVEncoderBitRateKey: 16000,
                                         AVSampleRateKey: 16000]

另外不要忘记在 fileName 中更改扩展名：

var fileName: String = "audioFile.mp4"

iOS - 录制一个 mp4 文件

iOS - Record an mp4 file

swift

avfoundation

avaudioplayer

avaudiorecorder