Recorded video rotates after adding watermark image in iOS - ios

Question

I m using bellow method to add watermark image to video, but the problem is when I record the video and add watermark to it, video rotates by 90 degree.
+(void)createWatermarkForVideo:(NSURL*)videoURL watermark:(UIImage*)watermarkImage stickerContainerView:(UIView*)containerView completionAction:(VideoMergeCompletionBlock)completion{
AVURLAsset *audioAsset, *videoAsset;
//Create AVMutableComposition Object which will hold our multiple AVMutableCompositionTrack or we can say it will hold our video and audio files.
AVMutableComposition* mixComposition = [AVMutableComposition composition];
//Now first load your audio file using AVURLAsset. Make sure you give the correct path of your videos.
audioAsset = [[AVURLAsset alloc]initWithURL:videoURL options:nil];
//Now we are creating the first AVMutableCompositionTrack containing our audio and add it to our AVMutableComposition object.
AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
//Now we will load video file.
videoAsset = [[AVURLAsset alloc]initWithURL:videoURL options:nil];
//Now we are creating the second AVMutableCompositionTrack containing our video and add it to our AVMutableComposition object.
AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *aVideoAssetTrack = [videoAsset tracksWithMediaType:AVMediaTypeVideo][0];
AVAssetTrack *aAudioAssetTrack = [audioAsset tracksWithMediaType:AVMediaTypeAudio][0];
CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration);
[a_compositionVideoTrack setPreferredTransform:aVideoAssetTrack.preferredTransform];
#try{
[a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:aVideoAssetTrack atTime:kCMTimeZero error:nil];
if(CMTimeGetSeconds(audioAsset.duration) == CMTimeGetSeconds(videoAsset.duration)){
#try{
[b_compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration) ofTrack:aAudioAssetTrack atTime:kCMTimeZero error:nil];
}
#catch(NSError *error){
}
}
else{
#try{
[b_compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration) ofTrack:aAudioAssetTrack atTime:kCMTimeZero error:nil];
}
#catch(NSError *error){
}
}
}
#catch(NSError *error){
}
// create the layer with the watermark image
CALayer* aLayer = [CALayer layer];
aLayer.contents = (id)watermarkImage.CGImage;
CGSize videoSize = [aVideoAssetTrack naturalSize];
CGFloat videoScale = videoSize.width/containerView.frame.size.width;
aLayer.frame = CGRectMake(0, 0, containerView.frame.size.width * videoScale, containerView.frame.size.height * videoScale);
aLayer.opacity = 0.9;
//sorts the layer in proper order
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
parentLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
videoLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:aLayer];
printf("Video Size %f %f",videoSize.width,videoSize.height);
//create the composition and add the instructions to insert the layer:
AVMutableVideoComposition* videoComp = [AVMutableVideoComposition videoComposition];
videoComp.renderSize = videoSize;
videoComp.frameDuration = CMTimeMake(1, 30);
videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
/// instruction
AVMutableVideoCompositionInstruction* instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack* mixVideoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:mixVideoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComp.instructions = [NSArray arrayWithObject: instruction];
AVAssetTrack *assetVideoTrack = [videoAsset tracksWithMediaType:AVMediaTypeVideo].lastObject;
// Apply the original transform.
if (assetVideoTrack && a_compositionVideoTrack) {
[a_compositionVideoTrack setPreferredTransform:assetVideoTrack.preferredTransform];
}
AVAssetExportSession *_assetExport;
// export video
_assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
_assetExport.videoComposition = videoComp;
NSLog (#"created exporter. supportedFileTypes: %#", _assetExport.supportedFileTypes);
NSString* videoName = #"NewWatermarkedVideo.mov";
NSString* exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName];
NSURL* exportUrl = [NSURL fileURLWithPath:exportPath];
if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath])
[[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
_assetExport.outputFileType = AVFileTypeQuickTimeMovie;
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
dispatch_async(dispatch_get_main_queue(), ^{
completion(_assetExport);
});
}
];
}