Opus codec issues

Opus is the newest lossy codec, and it seems to work pretty well. However it has some issues:

1. It is not widely supported as ogg-vorbis, although I can play it back in VLC and on my iPad.
2. Tracknumber is missing from metadata options
3. Metadata is not viewable in Windows Explorer
4. The MediaTab plugin to Windows Explorer will not recognize opus files

Try it out if you want to experiment. The program opusenc.exe must be located in the path, this is one of the utilties in the "Audio Tools" archive.
aatb --compress --ogg -u

Chris