Cannot create a new pixel buffer adaptor with an asset writer input that has already started writing'
reason: '*** -[AVAssetWriterInputPixelBufferAdaptor initWithAssetWriterInput:sourcePixelBufferAttributes:] Cannot create a new pixel buffer adaptor with an asset writer input that has already started writing'
assetWriterInput.readyForMoreMediaData为NO
解决方法:
[self setupAVAssetWriterInputPixelBufferAdaptor];
[self.assetWriter startWriting];
在starWriting方法之前先创建好AVAssetWriterInputPixelBufferAdaptor对象