Comments in /etc/libao.conf cause pulse output driver to fail
Example using pulseaudio output:
~ $ cat /etc/libao.conf
#HI
default_driver=pulse
~ $ ogg123 6.ogg
Audio Device: PulseAudio Output
Playing: 6.ogg
Ogg Vorbis stream: 6 channel, 44100 Hz
ERROR: Cannot open device pulse.vs.
~ $ cat /etc/libao.conf
default_driver=pulse
~ $ ogg123 6.ogg
Audio Device: PulseAudio Output
Playing: 6.ogg
Ogg Vorbis stream: 6 channel, 44100 Hz
Done.
^C~ $ The specific libao version used is gentoo's libao-1.1.0-r1