Yauap is a simple commandline audio player based on the GStreamer multimedia framework. It also exposes a DBus interface which allows other applications to use Yauap as a playback backend for audio files and streams. . You should install gstreamer0.10-plugins-ugly to get support for popular MPEG audio formats like MP3. You should install either gstreamer0.10-plugins-bad or gstreamer0.10-gnomevfs to get support for playback of network streams.
