录制视频相关

1.设置AVSampleBufferDisplayLayer全屏

视频输出
[layer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

• (void)addAVSampleBufferDisplayLayer {
  AVSampleBufferDisplayLayer * layer = [[AVSampleBufferDisplayLayer alloc] init];
  layer.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
  [layer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
  self.sampleDisplayLayer = layer;
  [self.view.layer addSublayer:layer];
  }

AVSampleBufferDisplayLayer 直接播放CMSampleBufferRef格式视频输出

• (void)enqueueSampleBuffer:(CMSampleBufferRef) sampleBuffer toLayer:(AVSampleBufferDisplayLayer*) layer
  {
  if (sampleBuffer){
  CFRetain(sampleBuffer);
  [layer enqueueSampleBuffer:sampleBuffer];
  CFRelease(sampleBuffer);
  if (layer.status == AVQueuedSampleBufferRenderingStatusFailed){
  NSLog(@"ERROR: %@", layer.error);
  if (-11847 == layer.error.code){
  }
  }else{
  // NSLog(@"STATUS: %i", (int)layer.status);
  }
  }else{
  NSLog(@"ignore null samplebuffer");
  }
  }

2.设置AVCaptureVideoPreviewLayer全屏

视频预览
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.avSession];
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[self.previewLayer setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view.layer insertSublayer:self.previewLayer above:0];

3.直接视频输出数据

AVSampleBufferDisplayLayer 正常 全屏 横向OK 纵向OK 横纵都不变形
AVCaptureVideoPreviewLayer 正常 全屏 横向OK 纵向OK 横纵都不变形