Trouble seeking into a remote track

> Am I missing something that would allow me to create a Song object with
> a valid duration?

The duration should be set based on information received from the remote
server or the file. I'm no expert in that field, never fully got it why
some files would work, others not. But IIRC some file formats don't send
that information in the header of the file, but rather towards the end
of the file. Therefore those files can't be seeked, as we'd get the
information too late (I think that's the case for m4a). Flac seeking has
been a problem, too.

Can you figure out some rule as to what files would work and which ones
not? Like eg. the file format, or the remote server etc.?

--

Michael