Question

在我的应用中，有必要在.mov和.mp4视频格式之间进行选择。

以下是我用来开始录制的代码：

func startCapturingVideo() {
    state.isRecording = true

    //Setting output file path
    let outputPath = NSTemporaryDirectory() + Date().description + "output" + "\(state.currentFileFormat.rawValue)"
    outputFileURL = URL(fileURLWithPath: outputPath)

    //Setting file type
    let fileType = (state.currentFileFormat == .mov) ? AVFileTypeQuickTimeMovie : AVFileTypeMPEG4
    try? FileManager.default.removeItem(at: outputFileURL!)

    //Compression settings
    let compressionSettings: [String: Any] = [AVVideoAverageBitRateKey: NSNumber(value: 20000000),
                                          AVVideoMaxKeyFrameIntervalKey: NSNumber(value: 1),
                                          AVVideoProfileLevelKey: AVVideoProfileLevelH264Baseline41]


    let videoSettings: [String : Any] = [
        AVVideoCodecKey  : AVVideoCodecH264,
        AVVideoCompressionPropertiesKey: compressionSettings,
        AVVideoWidthKey  : 1920,
        AVVideoHeightKey : 1080,
        AVVideoScalingModeKey:AVVideoScalingModeResizeAspectFill
    ]

    //If fileType is AVFileTypeMPEG4, this leads to an error
    //when AVAssetWriterInput initiated inside MovieOutput
    movieOutput = try? MovieOutput(URL: outputFileURL!, 
        size: Size(width:1920, height: 1080), 
        fileType: fileType, 
        liveVideo: true,
        settings: videoSettings as [String : AnyObject])

    camera?.audioEncodingTarget = movieOutput
    crop! --> upscale! --> movieOutput!
    movieOutput?.startRecording()
    DispatchQueue.main.async {
        self.startRecordingAnimation()
        self.disableButtons()
        self.timerManager.start()
        self.registerBackgroundTask()
    }
}

如果我选择AVFileTypeMPEG4，我会收到如下错误：

-[AVAssetWriter addInput:] 
In order to perform passthrough to file type public.mpeg-4,
please provide a format hint in the AVAssetWriterInput initializer

看起来这里有某种解决方案（中文）： http://www.jianshu.com/p/f58edf54e14c

但是，我不太了解它。

如果有人遇到同样的问题，请提供帮助。

谢谢！

尝试使用GPUImage2录制MPEG4视频时出错

0 个答案: