2 - flac plugin doesn't work with mono files
3 - why mozilla plugin is linked with libXt?
4 - why mkv plugin is linked with libsysfs?
5 - create specs and build plugins:
6 - tremor - http://xiph.org/vorbis
7 - goom - http://www.ios-software.com/?page=projet&quoi=1
8 - tarkin - http://xiph.org/vorbis (obsolete?)