我正在尝试通过使用内存中流作为源流将动态生成的数据提供给媒体基础源阅读器:InMemoryRandomAccessStream^memstream=refnewInMemoryRandomAccessStream();IRandomAccessStream^pInputStream=(IRandomAccessStream^)memstream;ComPtrpInputByteStream;MFCreateMFByteStreamOnStreamEx((IUnknown*)pInputStream,&pInputByteStream);hr=MFCreateSourceReaderFr