Swift 4-在mac os上使用AVAssetWriter录制avfoundation屏幕和音频-视频冻结

import AVFoundation

guard let assetWriter = try? AVAssetWriter(outputURL: outputURL, fileType: AVFileType.mp4) else {
    return
}

let audioSettings = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVSampleRateKey: 44100,
    AVNumberOfChannelsKey: 2,
    AVEncoderBitRateKey: 128000
]

let audioInput = AVAssetWriterInput(mediaType: AVMediaType.audio, outputSettings: audioSettings)

let videoSettings = [
    AVVideoCodecKey: AVVideoCodecType.h264,
    AVVideoWidthKey: 1920,
    AVVideoHeightKey: 1080
]

let videoInput = AVAssetWriterInput(mediaType: AVMediaType.video, outputSettings: videoSettings)

if assetWriter.canAdd(audioInput) {
    assetWriter.add(audioInput)
}

if assetWriter.canAdd(videoInput) {
    assetWriter.add(videoInput)
}

assetWriter.startWriting()

audioInput.append(sampleBuffer)
videoInput.append(sampleBuffer)

assetWriter.finishWriting {
    // 写入完成后的回调处理
}