使用appendSampleBuffer处理音频和视频时暂停AVAssetWriter会导致不同步。有没有办法暂停录音？

import AVFoundation

class AudioVideoRecorder {
    private var captureSession: AVCaptureSession!
    private var audioInput: AVCaptureDeviceInput!
    private var videoInput: AVCaptureDeviceInput!
    private var assetWriter: AVAssetWriter!
    private var audioOutput: AVAssetWriterInput!
    private var videoOutput: AVAssetWriterInput!

    init() {
        // 初始化AVCaptureSession和AVAssetWriter
        captureSession = AVCaptureSession()
        assetWriter = try! AVAssetWriter(outputURL: URL(fileURLWithPath: "output.mp4"), fileType: .mp4)

        // 配置音频和视频输入
        audioInput = try! AVCaptureDeviceInput(device: AVCaptureDevice.default(for: .audio))
        videoInput = try! AVCaptureDeviceInput(device: AVCaptureDevice.default(for: .video))

        // 配置音频和视频输出
        audioOutput = AVAssetWriterInput(mediaType: .audio, outputSettings: [:])
        videoOutput = AVAssetWriterInput(mediaType: .video, outputSettings: [:])

        // 将输入和输出添加到AVCaptureSession和AVAssetWriter中
        captureSession.addInput(audioInput)
        captureSession.addInput(videoInput)
        assetWriter.add(audioOutput)
        assetWriter.add(videoOutput)

        // 开始录制
        captureSession.startRunning()
        assetWriter.startWriting()
        assetWriter.startSession(atSourceTime: CMTime.zero)

        // 暂停录音
        audioInput.device.lockForConfiguration()
        audioInput.device.isSuspended = true
        audioInput.device.unlockForConfiguration()

        // 恢复录音
        audioInput.device.lockForConfiguration()
        audioInput.device.isSuspended = false
        audioInput.device.unlockForConfiguration()
    }
}