GPAC is mainly used to package multimedia content for local or streaming 
playback.  GPAC includes MP4Box utility which lets packaging of 
various audio and video codecs into mp4 container.

Optional dependencies include the following: wxPython, js, faad2, ffmpeg
xvidcore, a52dec, jack-audio-connection-kit, pulseaudio, xmlrpc-c and
xulrunner (building against this last is broken ATM).
