求助： AVAssetExportSession 在正常runtime下不工作

2018-07-10 04:28:08 320 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

weixin_42659924 墨衍会员 · AI 创作全网分发关注 + 加入社区

Autodesk激活无无网络选项？许可类型与脱机激活排查修复指南软件许可激活是保障正版授权正常使用的核心环节，常见的授权模式包括单机版许可和网络版许可，两者在认证机制和应用场景上有所区别。单机版离线授权依托 FlexNet Licensing Service 等底层服务组件，在断网或内网环境下为用户提供可靠的技术支持与授权验证路径。然而在实际部署中，激活窗口并不总是显示“无网络激活方式”入口，这可能与许可类型选择、网络环境干扰、组件安装残留或系统时间偏差有关。理解入口的动态呈现逻辑与排查顺序，有助于在 AutoCAD、Revit 等 Autodesk 产品中高效解决脱机阅读详情

我想把一个音频和视频merge到一起，但是output的时候总是会跳出NSUncaught exception，奇怪的是如果是一行一行stepover就可以正常工作。我感觉应该是thread出了问题，但是找不到具体的点。

这是我merge的函数。

    /// Merges video and sound while keeping sound of the video too

    ///

    /// - Parameters:

    ///   - videoUrl: URL to video file

    ///   - audioUrl: URL to audio file

    ///   - shouldFlipHorizontally: pass True if video was recorded using frontal camera otherwise pass False

    ///   - completion: completion of saving: error or url with final video

    func mergeVideoAndAudio(videoUrl: URL,

                            audioUrl: URL,

                            shouldFlipHorizontally: Bool = false,

                            completion: @escaping (_ error: Error?, _ url: URL?) -> Void) {

        

        let mixComposition = AVMutableComposition()

        var mutableCompositionVideoTrack = [AVMutableCompositionTrack]()

        var mutableCompositionAudioTrack = [AVMutableCompositionTrack]()

        var mutableCompositionAudioOfVideoTrack = [AVMutableCompositionTrack]()

        

        //start merge

        

        let aVideoAsset = AVAsset(url: videoUrl)

        let aAudioAsset = AVAsset(url: audioUrl)

        

        let compositionAddVideo = mixComposition.addMutableTrack(withMediaType: AVMediaType.video,

                                                                 preferredTrackID: kCMPersistentTrackID_Invalid)

        

        let compositionAddAudio = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio,

                                                                 preferredTrackID: kCMPersistentTrackID_Invalid)

        

        let compositionAddAudioOfVideo = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio,

                                                                        preferredTrackID: kCMPersistentTrackID_Invalid)

        

        let aVideoAssetTrack: AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaType.video)[0]

        let aAudioOfVideoAssetTrack: AVAssetTrack? = aVideoAsset.tracks(withMediaType: AVMediaType.audio).first

        let aAudioAssetTrack: AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaType.audio)[0]

        

        // Default must have tranformation

        compositionAddVideo?.preferredTransform = aVideoAssetTrack.preferredTransform

        

        if shouldFlipHorizontally {

            // Flip video horizontally

            var frontalTransform: CGAffineTransform = CGAffineTransform(scaleX: -1.0, y: 1.0)

            frontalTransform = frontalTransform.translatedBy(x: -aVideoAssetTrack.naturalSize.width, y: 0.0)

            frontalTransform = frontalTransform.translatedBy(x: 0.0, y: -aVideoAssetTrack.naturalSize.width)

            compositionAddVideo?.preferredTransform = frontalTransform

        }

        

        mutableCompositionVideoTrack.append(compositionAddVideo!)

        mutableCompositionAudioTrack.append(compositionAddAudio!)

        mutableCompositionAudioOfVideoTrack.append(compositionAddAudioOfVideo!)

        

        do {

            try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,

                                                                                aVideoAssetTrack.timeRange.duration),

                                                                of: aVideoAssetTrack,

                                                                at: kCMTimeZero)

            

            //In my case my audio file is longer then video file so i took videoAsset duration

            //instead of audioAsset duration

            try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,

                                                                                aVideoAssetTrack.timeRange.duration),

                                                                of: aAudioAssetTrack,

                                                                at: kCMTimeZero)

            

            // adding audio (of the video if exists) asset to the final composition

            if let aAudioOfVideoAssetTrack = aAudioOfVideoAssetTrack {

                try mutableCompositionAudioOfVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero,

                                                                                           aVideoAssetTrack.timeRange.duration),

                                                                           of: aAudioOfVideoAssetTrack,

                                                                           at: kCMTimeZero)

            }

        } catch {

            print(error.localizedDescription)

        }

        

        // Exporting

        let savePathUrl: URL = URL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")

        do { // delete old video

            try FileManager.default.removeItem(at: savePathUrl)

        } catch { print(error.localizedDescription) }

        

        let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!

        assetExport.outputFileType = AVFileType.mp4

        assetExport.outputURL = savePathUrl

        assetExport.shouldOptimizeForNetworkUse = true

        

        assetExport.exportAsynchronously{ () -> Void in

            

            switch assetExport.status {

            case AVAssetExportSessionStatus.completed:

                print("success")

                completion(nil, savePathUrl)

            case AVAssetExportSessionStatus.failed:

                print("failed \(assetExport.error?.localizedDescription ?? "error nil")")

                completion(assetExport.error, nil)

            case AVAssetExportSessionStatus.cancelled:

                print("cancelled \(assetExport.error?.localizedDescription ?? "error nil")")

                completion(assetExport.error, nil)

            default:

                print("complete")

                completion(assetExport.error, nil)

            }

            

            

        }

        

    }

这是我call function的地方。

@objc func touchCameraButton(){

soundFileURL!, completion: {(err, url) in print("fuck")})



    if isVideoRecordingOn{



        if isFirstTouch{

            startCapture()

            recordAudio()

            isFirstTouch = false

        }else{

            startCapture()

            recordAudio()

            self.mergeVideoAndAudio(videoUrl: videoFileURL, audioUrl: soundFileURL!, shouldFlipHorizontally: true, completion: {(err, url) in DispatchQueue.main.async {

                self.videoWithAudioURL = url

                if (err != nil){

                    print(err?.localizedDescription ?? "Error in merging video and audio")

                }

                self.isFirstTouch = true

                }

            })

    }

    }

}