合并缩放和旋转物镜后的视频C

Question

这是我的问题：我想生成包含多个视频部分的视频。 对于使用后置摄像头创建的视频，一切正常，但是当我尝试从自拍相机中引入视频时，我有一半黑色的屏幕。 这里是我用来旋转，缩放，重新录制视频的代码。我想我必须得申请其他转换，但我不能找到什么..

  CGAffineTransform orientationTransform = videoAssetTrack.preferredTransform; 
      CGSize naturalSize = CGSizeApplyAffineTransform(videoAssetTrack.naturalSize, orientationTransform); 
      naturalSize.width = fabs(naturalSize.width); 
      naturalSize.height = fabs(naturalSize.height); 

      // Make sure the video is transformed properly - Apply Aspect Fill 
      float scale = naturalSize.width < naturalSize.height ? _renderSize.width/naturalSize.width : _renderSize.height/naturalSize.height; 

      CGPoint recenter; 
      recenter.x = (_finalSize.width - naturalSize.width * scale) * 0.5; 
      recenter.y = (_finalSize.height - naturalSize.height * scale) * 0.5; 

      // If orientationTransform rotated the video in a way that changed the orientation, switch recenter 
      if ((videoAssetTrack.naturalSize.width > videoAssetTrack.naturalSize.height) != (naturalSize.width > naturalSize.height)) { 
       typeof(recenter.x) temp = recenter.x; 
       recenter.x = recenter.y; 
       recenter.y = temp; 
      }  
      CGAffineTransform transform = CGAffineTransformConcat(CGAffineTransformConcat(CGAffineTransformMakeScale(scale, scale), CGAffineTransformMakeTranslation(recenter.x, recenter.y)), orientationTransform); 

      [layerInstruction setTransform:transform atTime:timeOffset]; 

Answer 1

您需要为那些人像和风景的人分别做了变换。