web-dev-qa-db-ja.com

Swift 3：ビデオに透かしを追加する方法？AVVideoCompositionCoreAnimationTool iOS10の問題

このコードは、iOS9で機能して透かしとテキストをビデオに追加していましたが、iOS10以降は機能しなくなりました。 iOS 10のバグ が提出されましたが、Appleからの回答はありません。ビデオに透かしとテキストを追加するための回避策を実装できませんでした。このコードを使用すると、ビデオが正常にエクスポートされる場合がありますが、ほとんどの場合、エクスポートされません。

IOS9と同じように機能するように、AVVideoCompositionCoreAnimationToolをどのように使用すればよいですか。

let videoComposition: AVMutableVideoComposition = AVMutableVideoComposition()

videoComposition.frameDuration = CMTimeMake(1, 60)
videoComposition.renderSize = CGSize(width: clipVideoTrack.naturalSize.height, height: clipVideoTrack.naturalSize.height)


let instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()

instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))

// transformer is applied to set the video in portrait otherwise it is rotated by 90 degrees
let transformer: AVMutableVideoCompositionLayerInstruction =
    AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)

let t1: CGAffineTransform = CGAffineTransform(translationX: clipVideoTrack.naturalSize.height, y: -(clipVideoTrack.naturalSize.width - clipVideoTrack.naturalSize.height)/2)

let t2: CGAffineTransform = t1.rotated(by: CGFloat(M_PI_2))

var finalTransform: CGAffineTransform = t2

transformer.setTransform(finalTransform, at: kCMTimeZero)

instruction.layerInstructions = NSArray(object: transformer) as! [AVVideoCompositionLayerInstruction]

videoComposition.instructions = NSArray(object: instruction) as! [AVVideoCompositionInstructionProtocol]



let mixComposition = AVMutableComposition()
let compositionVideoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)


do {
    try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, asset.duration), of: clipVideoTrack, at: kCMTimeZero)
} catch {
    print(error)
}


//Add watermark


let myImage = UIImage(named: "logo")

let aLayer = CALayer()
aLayer.contents = myImage!.cgImage
aLayer.frame = CGRect(x: (clipVideoTrack.naturalSize.height*(self.view.bounds.width-45))/self.view.bounds.width, y: (clipVideoTrack.naturalSize.height*(self.view.bounds.width-40))/self.view.bounds.width, width: (clipVideoTrack.naturalSize.height*40)/self.view.bounds.width, height: (clipVideoTrack.naturalSize.height*40)/self.view.bounds.width)

let titleLayer = CATextLayer()
titleLayer.string = "text"
titleLayer.font = UIFont(name: "helvetica", size: 0)
titleLayer.fontSize = clipVideoTrack.naturalSize.height/16
titleLayer.shadowOpacity = 0.5
titleLayer.alignmentMode = kCAAlignmentCenter
titleLayer.frame = CGRect(x: 0, y: 0, width: clipVideoTrack.naturalSize.height, height: clipVideoTrack.naturalSize.height/6)
titleLayer.display()


let videoSize = asset.tracks(withMediaType: AVMediaTypeVideo)[0].naturalSize
let parentLayer = CALayer()
let videoLayer = CALayer()
parentLayer.frame = CGRect(x: 0, y: 0, width: videoSize.height, height: videoSize.height)
videoLayer.frame = CGRect(x: 0, y: 0, width: videoSize.height, height: videoSize.height)

parentLayer.addSublayer(videoLayer)
parentLayer.addSublayer(aLayer)
parentLayer.addSublayer(titleLayer)


videoComposition.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, in: parentLayer)



do { try FileManager.default.removeItem(at: filePath) }
catch let error as NSError {
    NSLog("\(error), \(error.localizedDescription)")
}



var exportUrl: URL = filePath
self.videoUrl = filePath as NSURL


var exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetMediumQuality)

exporter!.videoComposition = videoComposition
exporter!.outputFileType = AVFileTypeQuickTimeMovie
exporter!.outputURL = URL(fileURLWithPath: exportUrl.path)


exporter!.exportAsynchronously(completionHandler: {

    DispatchQueue.main.async {


        self.view.layer.addSublayer(self.avPlayerLayer)

        let item = AVPlayerItem(url: exportUrl)
        self.player.replaceCurrentItem(with: item)

        if (self.player.currentItem != nil) {
            print("Starting playback!")
            self.player.play()
        }

    }

})

注意：AVVideoCompositionCoreAnimationToolを削除すると、ビデオは常にエクスポートされますが、これには透かしとビデオのテキストがありません。 AVVideoCompositionCoreAnimationToolがAVAssetExportSessionと競合しないように機能させる方法は？

customVideoCompositorClassおよびAVVideoCompositingプロトコルを使用して 回避策 を実装しているものもありますが、これは以前の動作に比べて重い回避策のようです。

iosswiftvideoavassetexportsessionavvideocomposition
12
Sam

このソリューションは私にとって非常に簡単で超高速です

func addWatermark(inputURL: URL, outputURL: URL, handler:@escaping (_ exportSession: AVAssetExportSession?)-> Void) {
    let mixComposition = AVMutableComposition()
    let asset = AVAsset(url: inputURL)
    let videoTrack = asset.tracks(withMediaType: AVMediaType.video)[0]
    let timerange = CMTimeRangeMake(kCMTimeZero, asset.duration)

        let compositionVideoTrack:AVMutableCompositionTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid))!

    do {
        try compositionVideoTrack.insertTimeRange(timerange, of: videoTrack, at: kCMTimeZero)
        compositionVideoTrack.preferredTransform = videoTrack.preferredTransform
    } catch {
        print(error)
    }

    let watermarkFilter = CIFilter(name: "CISourceOverCompositing")!
    let watermarkImage = CIImage(image: UIImage(named: "waterMark")!)
    let videoComposition = AVVideoComposition(asset: asset) { (filteringRequest) in
        let source = filteringRequest.sourceImage.clampedToExtent()
        watermarkFilter.setValue(source, forKey: "inputBackgroundImage")
        let transform = CGAffineTransform(translationX: filteringRequest.sourceImage.extent.width - (watermarkImage?.extent.width)! - 2, y: 0)
        watermarkFilter.setValue(watermarkImage?.transformed(by: transform), forKey: "inputImage")
        filteringRequest.finish(with: watermarkFilter.outputImage!, context: nil)
    }

    guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPreset640x480) else {
        handler(nil)

        return
    }

    exportSession.outputURL = outputURL
    exportSession.outputFileType = AVFileType.mp4
    exportSession.shouldOptimizeForNetworkUse = true
    exportSession.videoComposition = videoComposition
    exportSession.exportAsynchronously { () -> Void in
        handler(exportSession)
    }
}

この関数の呼び出し方法を投稿していない場合は申し訳ありません。そのコードに触れていないのは久しぶりなので、これで十分だと思います。

let outputURL = NSURL.fileURL(withPath: "TempPath")
let inputURL = NSURL.fileURL(withPath: "VideoWithWatermarkPath")
addWatermark(inputURL: inputURL, outputURL: outputURL, handler: { (exportSession) in
    guard let session = exportSession else {
        // Error 
        return
    }
    switch session.status {
        case .completed:
        guard NSData(contentsOf: outputURL) != nil else {
            // Error
            return
        }

        // Now you can find the video with the watermark in the location outputURL

        default:
        // Error
    }
})
6
Muni

私はここからこの答えを得て、それは私のために働いています。それがあなたのために働いているかどうか見てください。

import UIKit
import AssetsLibrary
import AVFoundation

enum QUWatermarkPosition {
    case TopLeft
    case TopRight
    case BottomLeft
    case BottomRight
    case Default
}

class QUWatermarkManager: NSObject {

    func watermark(video videoAsset:AVAsset, watermarkText text : String, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((status : AVAssetExportSessionStatus!, session: AVAssetExportSession!, outputURL : NSURL!) -> ())?) {
        self.watermark(video: videoAsset, watermarkText: text, imageName: nil, saveToLibrary: flag, watermarkPosition: position) { (status, session, outputURL) -> () in
            completion!(status: status, session: session, outputURL: outputURL)
        }
    }

    func watermark(video videoAsset:AVAsset, imageName name : String, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((status : AVAssetExportSessionStatus!, session: AVAssetExportSession!, outputURL : NSURL!) -> ())?) {
        self.watermark(video: videoAsset, watermarkText: nil, imageName: name, saveToLibrary: flag, watermarkPosition: position) { (status, session, outputURL) -> () in
            completion!(status: status, session: session, outputURL: outputURL)
        }
    }

    private func watermark(video videoAsset:AVAsset, watermarkText text : String!, imageName name : String!, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((status : AVAssetExportSessionStatus!, session: AVAssetExportSession!, outputURL : NSURL!) -> ())?) {

        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -> Void in
            var mixComposition = AVMutableComposition()

            var compositionVideoTrack = mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
            var clipVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as! AVAssetTrack
            compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), ofTrack: clipVideoTrack, atTime: kCMTimeZero, error: nil)
            clipVideoTrack.preferredTransform

            let videoSize = clipVideoTrack.naturalSize

            var parentLayer = CALayer()
            var videoLayer = CALayer()
            parentLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height)
            videoLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height)
            parentLayer.addSublayer(videoLayer)

            if text != nil {
                var titleLayer = CATextLayer()
                titleLayer.backgroundColor = UIColor.redColor().CGColor
                titleLayer.string = text
                titleLayer.font = "Helvetica"
                titleLayer.fontSize = 15
                titleLayer.alignmentMode = kCAAlignmentCenter
                titleLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height)
                parentLayer.addSublayer(titleLayer)
            } else if name != nil {
                var watermarkImage = UIImage(named: name)
                var imageLayer = CALayer()
                imageLayer.contents = watermarkImage?.CGImage

                var xPosition : CGFloat = 0.0
                var yPosition : CGFloat = 0.0
                let imageSize : CGFloat = 57.0

                switch (position) {
                case .TopLeft:
                    xPosition = 0
                    yPosition = 0
                    break
                case .TopRight:
                    xPosition = videoSize.width - imageSize
                    yPosition = 0
                    break
                case .BottomLeft:
                    xPosition = 0
                    yPosition = videoSize.height - imageSize
                    break
                case .BottomRight, .Default:
                    xPosition = videoSize.width - imageSize
                    yPosition = videoSize.height - imageSize
                    break
                default:
                    break
                }


                imageLayer.frame = CGRectMake(xPosition, yPosition, imageSize, imageSize)
                imageLayer.opacity = 0.65
                parentLayer.addSublayer(imageLayer)
            }

            var videoComp = AVMutableVideoComposition()
            videoComp.renderSize = videoSize
            videoComp.frameDuration = CMTimeMake(1, 30)
            videoComp.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, inLayer: parentLayer)

            var instruction = AVMutableVideoCompositionInstruction()
            instruction.timeRange = CMTimeRangeMake(kCMTimeZero, mixComposition.duration)
            var videoTrack = mixComposition.tracksWithMediaType(AVMediaTypeVideo)[0] as! AVAssetTrack

            let layerInstruction = self.videoCompositionInstructionForTrack(compositionVideoTrack, asset: videoAsset)

            instruction.layerInstructions = [layerInstruction]
            videoComp.instructions = [instruction]

            let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! String
            var dateFormatter = NSDateFormatter()
            dateFormatter.dateStyle = .LongStyle
            dateFormatter.timeStyle = .ShortStyle
            let date = dateFormatter.stringFromDate(NSDate())
            let savePath = documentDirectory.stringByAppendingPathComponent("watermarkVideo-\(date).mov")
            let url = NSURL(fileURLWithPath: savePath)

            let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
            exporter.outputURL = url
            exporter.outputFileType = AVFileTypeQuickTimeMovie
            exporter.shouldOptimizeForNetworkUse = true
            exporter.videoComposition = videoComp

            exporter.exportAsynchronouslyWithCompletionHandler() {
                dispatch_async(dispatch_get_main_queue(), { () -> Void in
                    if exporter.status == AVAssetExportSessionStatus.Completed {
                        let outputURL = exporter.outputURL
                        if flag {
                            // Save to library
                            let library = ALAssetsLibrary()
                            if library.videoAtPathIsCompatibleWithSavedPhotosAlbum(outputURL) {
                                library.writeVideoAtPathToSavedPhotosAlbum(outputURL,
                                    completionBlock: { (assetURL:NSURL!, error:NSError!) -> Void in
                                        completion!(status: AVAssetExportSessionStatus.Completed, session: exporter, outputURL: outputURL)
                                })
                            }
                        } else {
                            completion!(status: AVAssetExportSessionStatus.Completed, session: exporter, outputURL: outputURL)
                        }

                    } else {
                        // Error
                        completion!(status: exporter.status, session: exporter, outputURL: nil)
                    }
                })
            }
        })
    }


    private func orientationFromTransform(transform: CGAffineTransform) -> (orientation: UIImageOrientation, isPortrait: Bool) {
        var assetOrientation = UIImageOrientation.Up
        var isPortrait = false
        if transform.a == 0 && transform.b == 1.0 && transform.c == -1.0 && transform.d == 0 {
            assetOrientation = .Right
            isPortrait = true
        } else if transform.a == 0 && transform.b == -1.0 && transform.c == 1.0 && transform.d == 0 {
            assetOrientation = .Left
            isPortrait = true
        } else if transform.a == 1.0 && transform.b == 0 && transform.c == 0 && transform.d == 1.0 {
            assetOrientation = .Up
        } else if transform.a == -1.0 && transform.b == 0 && transform.c == 0 && transform.d == -1.0 {
            assetOrientation = .Down
        }
        return (assetOrientation, isPortrait)
    }

    private func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction {
        let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
        let assetTrack = asset.tracksWithMediaType(AVMediaTypeVideo)[0] as! AVAssetTrack

        var transform = assetTrack.preferredTransform
        let assetInfo = orientationFromTransform(transform)

        var scaleToFitRatio = UIScreen.mainScreen().bounds.width / assetTrack.naturalSize.width
        if assetInfo.isPortrait {
            scaleToFitRatio = UIScreen.mainScreen().bounds.width / assetTrack.naturalSize.height
            let scaleFactor = CGAffineTransformMakeScale(scaleToFitRatio, scaleToFitRatio)
            instruction.setTransform(CGAffineTransformConcat(assetTrack.preferredTransform, scaleFactor),
                atTime: kCMTimeZero)
        } else {
            let scaleFactor = CGAffineTransformMakeScale(scaleToFitRatio, scaleToFitRatio)
            var concat = CGAffineTransformConcat(CGAffineTransformConcat(assetTrack.preferredTransform, scaleFactor), CGAffineTransformMakeTranslation(0, UIScreen.mainScreen().bounds.width / 2))
            if assetInfo.orientation == .Down {
                let fixUpsideDown = CGAffineTransformMakeRotation(CGFloat(M_PI))
                let windowBounds = UIScreen.mainScreen().bounds
                let yFix = assetTrack.naturalSize.height + windowBounds.height
                let centerFix = CGAffineTransformMakeTranslation(assetTrack.naturalSize.width, yFix)
                concat = CGAffineTransformConcat(CGAffineTransformConcat(fixUpsideDown, centerFix), scaleFactor)
            }
            instruction.setTransform(concat, atTime: kCMTimeZero)
        }

        return instruction
    }
}
3
User511

@ User511の答え

スウィフト3：

import UIKit
import AssetsLibrary
import AVFoundation
import Photos

enum QUWatermarkPosition {
    case TopLeft
    case TopRight
    case BottomLeft
    case BottomRight
    case Default
}

class QUWatermarkManager: NSObject {

    func watermark(video videoAsset:AVAsset, watermarkText text : String, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((_ status : AVAssetExportSessionStatus?, _ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?) {
        self.watermark(video: videoAsset, watermarkText: text, imageName: nil, saveToLibrary: flag, watermarkPosition: position) { (status, session, outputURL) -> () in
            completion!(status, session, outputURL)
        }
    }

    func watermark(video videoAsset:AVAsset, imageName name : String, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((_ status : AVAssetExportSessionStatus?, _ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?) {
        self.watermark(video: videoAsset, watermarkText: nil, imageName: name, saveToLibrary: flag, watermarkPosition: position) { (status, session, outputURL) -> () in
            completion!(status, session, outputURL)
        }
    }

    private func watermark(video videoAsset:AVAsset, watermarkText text : String!, imageName name : String!, saveToLibrary flag : Bool, watermarkPosition position : QUWatermarkPosition, completion : ((_ status : AVAssetExportSessionStatus?, _ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?) {
        DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {

            let mixComposition = AVMutableComposition()

            let compositionVideoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
            let clipVideoTrack = videoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
            do {
                try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: clipVideoTrack, at: kCMTimeZero)
            }
            catch {
                print(error.localizedDescription)
            }

            let videoSize = clipVideoTrack.naturalSize

            let parentLayer = CALayer()
            let videoLayer = CALayer()
            parentLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
            videoLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
            parentLayer.addSublayer(videoLayer)

            if text != nil {
                let titleLayer = CATextLayer()
                titleLayer.backgroundColor = UIColor.red.cgColor
                titleLayer.string = text
                titleLayer.font = "Helvetica" as CFTypeRef
                titleLayer.fontSize = 15
                titleLayer.alignmentMode = kCAAlignmentCenter
                titleLayer.bounds = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
                parentLayer.addSublayer(titleLayer)
            } else if name != nil {
                let watermarkImage = UIImage(named: name)
                let imageLayer = CALayer()
                imageLayer.contents = watermarkImage?.cgImage

                var xPosition : CGFloat = 0.0
                var yPosition : CGFloat = 0.0
                let imageSize : CGFloat = 57.0

                switch (position) {
                case .TopLeft:
                    xPosition = 0
                    yPosition = 0
                    break
                case .TopRight:
                    xPosition = videoSize.width - imageSize
                    yPosition = 0
                    break
                case .BottomLeft:
                    xPosition = 0
                    yPosition = videoSize.height - imageSize
                    break
                case .BottomRight, .Default:
                    xPosition = videoSize.width - imageSize
                    yPosition = videoSize.height - imageSize
                    break
                }


                imageLayer.frame = CGRect(x: xPosition, y: yPosition, width: imageSize, height: imageSize)
                imageLayer.opacity = 0.65
                parentLayer.addSublayer(imageLayer)
            }

            let videoComp = AVMutableVideoComposition()
            videoComp.renderSize = videoSize
            videoComp.frameDuration = CMTimeMake(1, 30)
            videoComp.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, in: parentLayer)

            let instruction = AVMutableVideoCompositionInstruction()
            instruction.timeRange = CMTimeRangeMake(kCMTimeZero, mixComposition.duration)
            _ = mixComposition.tracks(withMediaType: AVMediaTypeVideo)[0] as AVAssetTrack

            let layerInstruction = self.videoCompositionInstructionForTrack(track: compositionVideoTrack, asset: videoAsset)

            instruction.layerInstructions = [layerInstruction]
            videoComp.instructions = [instruction]

            let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
            let dateFormatter = DateFormatter()
            dateFormatter.dateStyle = .long
            dateFormatter.timeStyle = .short
            let date = dateFormatter.string(from: Date())
            let url = URL(fileURLWithPath: documentDirectory).appendingPathComponent("watermarkVideo-\(date).mov")

            let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
            exporter?.outputURL = url
            exporter?.outputFileType = AVFileTypeQuickTimeMovie
            exporter?.shouldOptimizeForNetworkUse = true
            exporter?.videoComposition = videoComp

            exporter?.exportAsynchronously() {
                DispatchQueue.main.async {

                    if exporter?.status == AVAssetExportSessionStatus.completed {
                        let outputURL = exporter?.outputURL
                        if flag {
                            // Save to library
//                            let library = ALAssetsLibrary()

                            if UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(outputURL!.path) {
                                PHPhotoLibrary.shared().performChanges({
                                    PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputURL!)
                                }) { saved, error in
                                    if saved {
                                        completion!(AVAssetExportSessionStatus.completed, exporter, outputURL)
                                    }
                                }
                            }

//                            if library.videoAtPathIs(compatibleWithSavedPhotosAlbum: outputURL) {
//                                library.writeVideoAtPathToSavedPhotosAlbum(outputURL,
//                                                                           completionBlock: { (assetURL:NSURL!, error:NSError!) -> Void in
//                                                                            
//                                                                            completion!(AVAssetExportSessionStatus.Completed, exporter, outputURL)
//                                })
//                            }
                        } else {
                            completion!(AVAssetExportSessionStatus.completed, exporter, outputURL)
                        }

                    } else {
                        // Error
                        completion!(exporter?.status, exporter, nil)
                    }
                }
            }
        }
    }


    private func orientationFromTransform(transform: CGAffineTransform) -> (orientation: UIImageOrientation, isPortrait: Bool) {
        var assetOrientation = UIImageOrientation.up
        var isPortrait = false
        if transform.a == 0 && transform.b == 1.0 && transform.c == -1.0 && transform.d == 0 {
            assetOrientation = .right
            isPortrait = true
        } else if transform.a == 0 && transform.b == -1.0 && transform.c == 1.0 && transform.d == 0 {
            assetOrientation = .left
            isPortrait = true
        } else if transform.a == 1.0 && transform.b == 0 && transform.c == 0 && transform.d == 1.0 {
            assetOrientation = .up
        } else if transform.a == -1.0 && transform.b == 0 && transform.c == 0 && transform.d == -1.0 {
            assetOrientation = .down
        }
        return (assetOrientation, isPortrait)
    }

    private func videoCompositionInstructionForTrack(track: AVCompositionTrack, asset: AVAsset) -> AVMutableVideoCompositionLayerInstruction {
        let instruction = AVMutableVideoCompositionLayerInstruction(assetTrack: track)
        let assetTrack = asset.tracks(withMediaType: AVMediaTypeVideo)[0]

        let transform = assetTrack.preferredTransform
        let assetInfo = orientationFromTransform(transform: transform)

        var scaleToFitRatio = UIScreen.main.bounds.width / assetTrack.naturalSize.width
        if assetInfo.isPortrait {
            scaleToFitRatio = UIScreen.main.bounds.width / assetTrack.naturalSize.height
            let scaleFactor = CGAffineTransform(scaleX: scaleToFitRatio, y: scaleToFitRatio)
            instruction.setTransform(assetTrack.preferredTransform.concatenating(scaleFactor),
                                     at: kCMTimeZero)
        } else {
            let scaleFactor = CGAffineTransform(scaleX: scaleToFitRatio, y: scaleToFitRatio)
            var concat = assetTrack.preferredTransform.concatenating(scaleFactor).concatenating(CGAffineTransform(translationX: 0, y: UIScreen.main.bounds.width / 2))
            if assetInfo.orientation == .down {
                let fixUpsideDown = CGAffineTransform(rotationAngle: CGFloat(Double.pi))
                let windowBounds = UIScreen.main.bounds
                let yFix = assetTrack.naturalSize.height + windowBounds.height
                let centerFix = CGAffineTransform(translationX: assetTrack.naturalSize.width, y: yFix)
                concat = fixUpsideDown.concatenating(centerFix).concatenating(scaleFactor)
            }
            instruction.setTransform(concat, at: kCMTimeZero)
        }

        return instruction
    }
}
2
Seyed Samad Gholamzadeh