macos 使用VideoToolBox编码H265一直失败

在mac上使用VideoToolBox上使用H265编码，当调用VTCompressionSessionEncodeFrame就会报下面的错误，并且在此之前设置了kCVImageBufferTransferFunctionKey，设置方法如下：

CVBufferSetAttachment(pixeBuffer,kCVImageBufferTransferFunctionKey,
kCVImageBufferTransferFunction_ITU_R_709_2,
kCVAttachmentMode_ShouldPropagate);

求解应该怎么做？

convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.
convertAttachmentToIOSurfaceStruct Error: For kCVImageBufferTransferFunctionKey, attachmentValue is invalid.

修改CVBufferSetAttachment参数，或者不使用硬编码