Autre element de chez "http://www.maersk-moller.net/projects/mpeg4ip/Features.html"

 - (g)mp4player now plays Vorbis streamed as unicast and/or 
     multicast using RTP/RTSP as well as playing Vorbis audio 
     tracks* stored in mp4 files locally. 

avec l'* en bas de page :
    * The player currently only plays Vorbis encoded audio from a 
      MP4 file if data was saved with the Ogg header. This is not 
      portable and will be fixed in the future. 

c'est a dire que pour le moment OGG dans de l'UDP ou RTP ne semble marcher
que si l'on a la chance de ne pas perdre le debut de la transmission...

(a verifier)