oggenc manpage and --help disagree on default bitrate
The oggenc manpage says
-b n, --bitrate=n
Sets encoding to the bitrate closest to n (in
kb/s). Defaults to 160 kb/s for stereo.
And oggenc --help says (under MODES)
The default is the 128 kbps mode.
(I think line 54 of oggenc.c sets the actual default to 128.)