[Vorbis] oggdec and ogg123 playing audio from an Ogg Theora+Vorbis file?

[J.B. Nicholson-Owens]

Are oggdec and ogg123 supposed to be able to extract or play audio from an Ogg 
Theora+Vorbis file?

OggDec 1.0 and ogg123 from vorbis-tools 1.0.1 don't seem to be able to do so.

If the programs are not supposed to do this job now, are any improvements 
planned so they can do this job in the future?

Thanks for info on this.