Question

当我尝试使用AVAssetExport导出资产时，我只会对通过whatsapp收到的视频产生以下错误。我找不到合适的解决方案。我也尝试过实现代码来修复视频时长，但我没有修复它。错误是：错误域= NSOSStatusErrorDomain代码= -12780 \“（null）\”

这里是代码

PHCachingImageManager().requestAVAsset(forVideo: asset.phAsset!, options: nil, resultHandler: { (AVAssetRecivied, audioMix, info) in
                let AVAssetMy = AVAssetRecivied!.normalizingMediaDuration()
                let exportSession : AVAssetExportSession?
                if (AVAssetMy as? AVURLAsset) != nil {
                exportSession = AVAssetExportSession(asset: (AVAssetMy as? AVURLAsset)!, presetName: AVAssetExportPresetMediumQuality)
                }
                else {
                exportSession = AVAssetExportSession(asset: (AVAssetMy as? AVComposition)!, presetName: AVAssetExportPresetMediumQuality)
                }
                exportSession?.outputURL = URL(fileURLWithPath: NSTemporaryDirectory() + NSUUID().uuidString + ".m4v")
                exportSession?.outputFileType = AVFileTypeQuickTimeMovie
                exportSession?.audioMix = audioMix
                exportSession?.shouldOptimizeForNetworkUse = true
                exportSession?.exportAsynchronously { () -> Void in
                    if exportSession?.status == .completed {
                    self.getFileSize(url: exportSession!.outputURL!)
                    if self.myMediaArray == nil {
                        self.myMediaArray = [["Video" : AVAsset(url: exportSession!.outputURL!)]]
                        DispatchQueue.main.async {
                            self.collectionViewImage.reloadData()
                        }
                    } else {
                        self.myMediaArray?.append(["Video" : AVAsset(url: exportSession!.outputURL!)])
                        DispatchQueue.main.async {
                            self.collectionViewImage.reloadData()
                        }
                    }}
                }
            })

以下是调整视频持续时间的方法

func normalizingMediaDuration() -> AVAsset? {
    let mixComposition : AVMutableComposition = AVMutableComposition()
    var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
    var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
    let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()

    guard let video = tracks(withMediaType: AVMediaTypeVideo).first else {
        return nil
    }

    guard let audio = tracks(withMediaType: AVMediaTypeAudio).first else {
        return nil
    }

    mutableCompositionVideoTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
    mutableCompositionAudioTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))

    let duration = video.timeRange.duration.seconds > audio.timeRange.duration.seconds ? audio.timeRange.duration : video.timeRange.duration

    do{
        try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,duration), of: video, at: kCMTimeZero)
        try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, duration), of: audio, at: kCMTimeZero)
    }catch{
        return nil
    }

    totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,duration)

    return mixComposition
}

}

该文件是： 1）可出口 2）预设和格式兼容 3）我尝试在导出之前将文件移动到文档中4）我尝试更改文件扩展名。

Answer 1

这是一个错误。错误报告：https://bugreport.apple.com/web/?problemID=34574848 欢迎替代品......

Answer 2

我遇到了同样的问题，并得到了相同的错误代码-12780。唯一能解决这个问题的是：发送到exportSession？.outputURL NSURL变量并将其作为URL 我不知道它为什么有效，我希望你也能发现它有用。

错误域= NSOSStatusErrorDomain代码= -12780 \“（null）\”

2 个答案: