我正在尝试使用AVAssetWriter应用过滤器来录制视频,但是当我开始录制其录制的1到2秒视频的视频时,却没有CMSampleBuffer,我无法从CMSampleBufferGetImageBuffer(sampleBuffer)获取图像
public func captureOutput(_ captureOutput:AVCaptureOutput,didOutput sampleBuffer:CMSampleBuffer,from connection:AVCaptureConnection){
getDerivedStateFromProps