If, like me, you've got a lot of transferred minidisc recordings which can only be accessed on the Windows installation to which they were originally imported or (even worse) you've effectively lost recordings because the original computer no longer works or has had Windows re-installed, then the good news is that ffmpeg (but not avconv) can now read your .oma files (despite Sony's awful DRM) and convert them to mp3.
See this post for details:
I've converted quite a few files (using the WinFF gui on Windows 7) and it works fine.
See this post for details:
I've converted quite a few files (using the WinFF gui on Windows 7) and it works fine.