Video orientation after audio and video merge - ios

Question

I was trying to merge one audio and video, but when I save video to my library it's save. I was following some tutorial for this, but didn't find any suitable answer.
but proble is video in not portrait mode.
So how can i get video with portrait in my library
here what i try
func mergeFilesWithUrl(videoUrl:NSURL, audioUrl:NSURL)
{
let mixComposition : AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
//start merge
let aVideoAsset : AVAsset = AVAsset(url: videoUrl as URL)
let aAudioAsset : AVAsset = AVAsset(url: audioUrl as URL)
mutableCompositionVideoTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioTrack.append( mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
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)
try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
}catch{
}
totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration )
let mutableVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition()
mutableVideoComposition.frameDuration = CMTimeMake(1, 30)
mutableVideoComposition.renderSize = CGSize(width: 1280, height: 720)
//find your video on this URl
let savePathUrl : NSURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
assetExport.outputFileType = AVFileTypeMPEG4
assetExport.outputURL = savePathUrl as URL
assetExport.shouldOptimizeForNetworkUse = true
assetExport.exportAsynchronously { () -> Void in
switch assetExport.status {
case AVAssetExportSessionStatus.completed:
//here i Store into asset library
let assetsLib = ALAssetsLibrary()
assetsLib.writeVideoAtPath(toSavedPhotosAlbum: savePathUrl as URL!, completionBlock: nil)
print("success")
case AVAssetExportSessionStatus.failed:
print("failed \(String(describing: assetExport.error))")
case AVAssetExportSessionStatus.cancelled:
print("cancelled \(String(describing: assetExport.error))")
default:
print("complete")
}
}
}

Answer 1

You Have two ways to fix that.
FIRST METHOD WITHOUT USING AVMutableVideoComposition
let mainComposition = AVMutableComposition()
let videoTrack = mainComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
let videoAssetTrack = videoAsset.tracks(withMediaType: AVMediaTypeVideo).first!
try? videoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAssetTrack, at: kCMTimeZero)
videoTrack.preferredTransform = videoAssetTrack.preferredTransform // THIS LINE IS IMPORTANT
let audioTrack = mainComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
let audioAssetTrack = audioAsset.tracks(withMediaType: AVMediaTypeAudio).first!
try? audioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, audioAsset.duration), of: audioAssetTrack, at: kCMTimeZero)
let exportSession = AVAssetExportSession(asset: mainComposition, presetName: AVAssetExportPresetHighestQuality)
exportSession?.outputURL = outputURL
exportSession?.outputFileType = AVFileTypeQuickTimeMovie
exportSession?.shouldOptimizeForNetworkUse = true
exportSession?.exportAsynchronously {
}
SECOND METHOD WITH AVMutableVideoComposition
let mainComposition = AVMutableComposition()
let videoTrack = mainComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
let videoAssetTrack = videoAsset.tracks(withMediaType: AVMediaTypeVideo).first!
try? videoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAssetTrack, at: kCMTimeZero)
let audioTrack = mainComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
let audioAssetTrack = audioAsset.tracks(withMediaType: AVMediaTypeAudio).first!
try? audioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, audioAsset.duration), of: audioAssetTrack, at: kCMTimeZero)
let videoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack)
videoCompositionLayerInstruction.setTransform(videoAssetTrack.preferredTransform, at: kCMTimeZero)
let videoCompositionInstuction = AVMutableVideoCompositionInstruction()
videoCompositionInstuction.timeRange = CMTimeRangeMake(kCMTimeZero, mainComposition.duration)
videoCompositionInstuction.layerInstructions = [ videoCompositionLayerInstruction ]
var renderSize = videoAssetTrack.naturalSize
renderSize = renderSize.applying(videoAssetTrack.preferredTransform)
renderSize = CGSize(width: fabs(renderSize.width), height: fabs(renderSize.height))
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = renderSize
videoComposition.frameDuration = CMTimeMake(1, 30)
videoComposition.instructions = [ videoCompositionInstuction ]
let exportSession = AVAssetExportSession(asset: mainComposition, presetName: AVAssetExportPresetHighestQuality)
exportSession?.videoComposition = videoComposition
exportSession?.outputURL = outputURL
exportSession?.outputFileType = AVFileTypeQuickTimeMovie
exportSession?.shouldOptimizeForNetworkUse = false
exportSession?.exportAsynchronously {
}