cut designated area.and the result direction is wrong

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cut designated area

use SCAssetExportSession result is wrong, direction could rotate M_PI_2

SCAssetExportSession *exportSession = [[SCAssetExportSession alloc] initWithAsset:self.recordSession.assetRepresentingSegments]; exportSession.videoConfiguration.filter = currentFilter; exportSession.videoConfiguration.preset = SCPresetHighestQuality; exportSession.audioConfiguration.preset = SCPresetHighestQuality; exportSession.videoConfiguration.maxFrameRate = 35; exportSession.outputUrl = exportUrl; exportSession.outputFileType = AVFileTypeMPEG4; // exportSession.delegate = self; exportSession.contextType = SCContextTypeAuto;

exportSession.videoConfiguration.sizeAsSquare = YES;
exportSession.videoConfiguration.composition = [self getCpmposition];

but i use AVAssetExportSession . the result is right

self.exporter = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetHighestQuality] ;
self.exporter.videoComposition =  [self getCpmposition];
self.exporter.outputURL = exportUrl;
self.exporter.outputFileType = AVFileTypeQuickTimeMovie;

• (AVMutableVideoComposition *)getCpmposition{

  //load our movie Asset AVAsset *asset = [_recordSession assetRepresentingSegments];

  //create an avassetrack with our asset AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

  //create a video composition and preset some settings AVMutableVideoComposition* videoComposition = [AVMutableVideoComposition videoComposition]; videoComposition.frameDuration = CMTimeMake(1, 30); //here we are setting its render size to its height x height (Square) videoComposition.renderSize = CGSizeMake(clipVideoTrack.naturalSize.height, clipVideoTrack.naturalSize.height);

  //create a video instruction AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30));

  AVMutableVideoCompositionLayerInstruction* transformer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack];

  CGAffineTransform t1 = CGAffineTransformMakeTranslation(clipVideoTrack.naturalSize.height, -(clipVideoTrack.naturalSize.width - clipVideoTrack.naturalSize.height));

  CGAffineTransform t2 = CGAffineTransformRotate(t1, M_PI_2); CGAffineTransform finalTransform = t2; [transformer setTransform:finalTransform atTime:kCMTimeZero];

  //add the transformer layer instructions, then add to video composition instruction.layerInstructions = [NSArray arrayWithObject:transformer]; videoComposition.instructions = [NSArray arrayWithObject: instruction];

  return videoComposition;

}