File ref mp4.

[Adam Panayis]

Hi, I'm using taglib version 1.6. I have configured with --enable-mp4 
--enable-asf.

I try to open a mp4 file as follows: TagLib::FileRef f(file.c_str());

f.isNull then returns true indicating failure.

No doubt I am making a fundamental mistake here. Can someone help?

Thanks
Adam