Vorbis - Mar 2003 - downsampling/pealing bitrate from file1.ogg to file2.ogg

the oggenc program does not appear to be capable of taking ogg vorbis as an 
infile.  am i supposed to set up icecast just to change the quality level of 
an ogg vorbis file?

i have a file, say sample-q6.ogg, and i want to do this:
   oggenc -q4 -o sample-q4.ogg sample-q6.ogg

currently the only way to do this is (i think):
   ogg123 -d raw sample-q6.ogg |oggenc --raw -q4 -o sample-q4.ogg -

i am under the impression that the workaround is not optimal and can cause 
unneccessary loss.  i am also understanding the bitrate sampling ability of 
vorbis as being able to lower a file's bitrate so that the end result would 
be of the same quality as if the new file had been encoded from the original
wav.

thanks!
-khopesh

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