Objective C - Rotate a video file with AVMutableVideoCompositionLayerInstruction

VideoFileRotate.m

-(void)changeOrientation:(NSURL *) videoURL isClockWise:(BOOL)isClockWise fileName:(NSString *)fileName{
    
    AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoURL options:nil];
    AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init];
    AVMutableCompositionTrack *videoCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
     [videoCompositionTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
    AVMutableVideoCompositionInstruction *videoCompositionInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
    videoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
        
    AVMutableVideoCompositionLayerInstruction *videoCompositionLayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoCompositionTrack];
    AVAssetTrack *firstVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

    [videoCompositionLayerInstruction setOpacity:0.0 atTime:videoAsset.duration];
    videoCompositionInstruction.layerInstructions = [NSArray arrayWithObjects:videoCompositionLayerInstruction,nil];
    
    AVMutableVideoComposition *exportVideoComposition = [AVMutableVideoComposition videoComposition];

    exportVideoComposition.instructions = [NSArray arrayWithObject:videoCompositionInstruction];

    exportVideoComposition.frameDuration = CMTimeMake(1, 30);
    CGSize naturalSizeFirst;
    
    CGAffineTransform mixedTransform;
    
    if (isClockWise) {
        CGAffineTransform rotation = CGAffineTransformMakeRotation(degreeToRadian(90.0));
        CGAffineTransform translateToCenter = CGAffineTransformMakeTranslation(firstVideoTrack.naturalSize.height, 0);
        mixedTransform = CGAffineTransformConcat(rotation, translateToCenter);
    } else {
        CGAffineTransform rotation = CGAffineTransformMakeRotation(degreeToRadian(-90.0));
        CGAffineTransform translateToCenter = CGAffineTransformMakeTranslation(0,firstVideoTrack.naturalSize.width);
        mixedTransform = CGAffineTransformConcat(rotation, translateToCenter);
    }
        
    [videoCompositionLayerInstruction setTransform:mixedTransform atTime:kCMTimeZero];
    
    naturalSizeFirst = CGSizeMake(firstVideoTrack.naturalSize.height, firstVideoTrack.naturalSize.width);
    exportVideoComposition.renderSize = naturalSizeFirst;

    NSString *tmpDirectory = NSTemporaryDirectory();
    
    NSString *tmpFile = [tmpDirectory stringByAppendingPathComponent:fileName];

    NSURL *url = [NSURL fileURLWithPath:tmpFile];
    AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];

    
    if ([[NSFileManager defaultManager] fileExistsAtPath:tmpFile])
    {
        [[NSFileManager defaultManager] removeItemAtPath:tmpFile error:nil];
    }
    
    exporter.outputURL=url;
    exporter.outputFileType = AVFileTypeQuickTimeMovie;
    exporter.videoComposition = exportVideoComposition;
    exporter.shouldOptimizeForNetworkUse = YES;


    // Save your video in Temporary directory and save path for uploading to server.
    [exporter exportAsynchronouslyWithCompletionHandler:^{

        if (AVAssetExportSessionStatusCompleted == exporter.status) {

            NSLog(@"AVAssetExportSessionStatusCompleted");
            NSLog(@"new video saved");
        } else if (AVAssetExportSessionStatusFailed == exporter.status) {

            NSLog(@"AVAssetExportSessionStatusFailed %@",exporter.error);
        } else {

            NSLog(@"Export Session Status: %d", exporter.status);
        }
    }];
}

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