我正在调整我的肖像视频的大小，但我不想从顶部和底部裁剪帧的某些部分，以下是我使用的代码：
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = CGSize(width: CGFloat(clipVideoTrack.naturalSize.height), height: CGFloat(clipVideoTrack.naturalSize.height))
videoComposition.frameDuration = CMTimeMake(1, 30)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))
// let firstInstruction = VideoHelper.videoCompositionInstruction(videoComposition, asset: asset)
//rotate to potrait
let transformer = AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
let t1 = CGAffineTransform(translationX: clipVideoTrack.naturalSize.height, y: -(clipVideoTrack.naturalSize.width - clipVideoTrack.naturalSize.height) / 2)
let t2: CGAffineTransform = t1.rotated(by: .pi/2)
// let t3:CGAffineTransform = t2.scaledBy(x: 1.0 , y: 1.0)
let finalTransform: CGAffineTransform = t2
transformer.setTransform(finalTransform, at: kCMTimeZero)
instruction.layerInstructions = [transformer]
videoComposition.instructions = [instruction]
在此之后，我导出了资产，但它切了我的框架，有什么方法可以调整视频的大小而无需裁剪