Question

在将Obj-C项目移至Swift时遇到一些问题。我有一种旨在合并视频数组的方法。但是问题是，当我向导出器添加mutablevideocomposition时，出现以下错误。

Optional（Error Domain = AVFoundationErrorDomain代码= -11841“操作已停止” UserInfo = {NSLocalizedFailureReason =无法播放视频 composition。，NSLocalizedDescription =操作已停止， NSUnderlyingError = 0x28195a250 {Error Domain = NSOSStatusErrorDomain Code = -17390“（null）”}}）

如果我不将其包含在导出器中，则视频会合并在一起，但我没有变换指令，并且方向无处不在。为简单起见，我添加了

var transform：CGAffineTransform = video.preferredTransform

而不是更复杂的转换，但这仍然没有任何区别。

// MARK: - MERGE THE VIDEOS
    func mergeVideos( videoArray: [AVAsset] ){


        // 1 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
        let mixComposition = AVMutableComposition()

        // Set the starting time
        var currentTime = CMTime.zero;

        let videoToAdd = mixComposition.addMutableTrack(withMediaType: AVMediaType.video,
                                                        preferredTrackID: Int32(kCMPersistentTrackID_Invalid))

        let audioToAdd = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio,
                                                        preferredTrackID: Int32(kCMPersistentTrackID_Invalid))

        var instructions: [AVVideoCompositionInstructionProtocol] = []

        for video: AVAsset in videoArray {

            do {
                try videoToAdd!.insertTimeRange(CMTimeRange(start: CMTime.zero, duration: video.duration),
                                               of: video.tracks(withMediaType: AVMediaType.video)[0],
                                               at: currentTime)
            } catch {
                print("Failed to load first track")
                return
            }

            do {
                try audioToAdd?.insertTimeRange(CMTimeRange(start: CMTime.zero, duration: video.duration),
                                                of: video.tracks(withMediaType: AVMediaType.audio)[0] ,
                                                at: currentTime)
            } catch {
                print("Failed to load Audio track")
            }


            let videoCompositionInstruction = AVMutableVideoCompositionInstruction()
            videoCompositionInstruction.timeRange = CMTimeRange(start: currentTime, duration: video.duration)

            let layerInstruction = AVMutableVideoCompositionLayerInstruction()



            var transform: CGAffineTransform = video.preferredTransform

            layerInstruction.setTransform(transform, at: CMTime.zero)



            videoCompositionInstruction.layerInstructions = [layerInstruction];

            instructions.append(videoCompositionInstruction)

            currentTime = CMTimeAdd(currentTime, video.duration)

        }


        // 4 - Get path
        guard let documentDirectory = FileManager.default.urls(for: .documentDirectory,
                                                               in: .userDomainMask).first else {
                                                                return
        }
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .long
        dateFormatter.timeStyle = .short
        let date = dateFormatter.string(from: Date())
        let url = documentDirectory.appendingPathComponent("mergeVideo-\(date).mov")


        // 5 - Create Exporter
        guard let exporter = AVAssetExportSession(asset: mixComposition,
                                                  presetName: AVAssetExportPresetHighestQuality) else {
                                                    return
        }


        // 6 - Setup The Video Composition

        let mutableVideoComposition = AVMutableVideoComposition()
        mutableVideoComposition.frameDuration = CMTime(seconds: 1, preferredTimescale: 12)
        mutableVideoComposition.renderSize = CGSize(width: 1920, height: 1080)
        mutableVideoComposition.instructions = instructions

        exporter.outputURL = url
        exporter.outputFileType = AVFileType.mov
        exporter.shouldOptimizeForNetworkUse = true
        exporter.videoComposition = mutableVideoComposition

        // 6 - Perform the Export
        exporter.exportAsynchronously() {

            if(exporter.status == AVAssetExportSession.Status.completed){

                DispatchQueue.main.async {

                        PHPhotoLibrary.shared().performChanges({
                            PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: url)
                        }) { saved, error in
                            if saved {
                                let alertController = UIAlertController(title: "Your video was successfully saved", message: nil, preferredStyle: .alert)
                                let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil)
                                alertController.addAction(defaultAction)
                                self.present(alertController, animated: true, completion: nil)
                            }
                        }

                    //self.exportDidFinish(exporter)
                }

             }else {
                print(exporter.status.rawValue)
                print(exporter.error)
            }

        }

    }

无法合并视频并收到“操作已停止”错误

0 个答案: