How to set metadata like author and title on file created by sinkwriter

I have a windows store app where I use a SinkWriter to write audio and video samples to an mp4 file. I also want to write some metadata like author and title to the file. How do I have to do that?

When creating the SinkWriter I use the MFCreateSinkWriterFromURL function where I pass an IMFAttributes object. Do I have to use this object, and if so, what is the guidKey of author and title?

Thanks in advance!

Ronald