IPv6 Multicast streaming is possible with many softwares. DVTS and VLC (VideoLAN) are few of them:

DVTS: VLC VLC WebSite

Sender Side (Server)
(1)No Transcoding $ vlc video.avi --sout udp://[FF7E:120:2001:222::1111]:1234 --loop

(2)Transcoded Video+Audio $ vlc video.avi --sout '#transcode{vcodec=WMV2,vb=1024,scale=1,acodec=mp3,ab=192,channels=2}:std{access=udp,mux=ts,dst=[FF7E:120:2001:222::1111]:8000}' --sout-transcode-fps=25.0



Receiver (User) vlc udp://[FF7E:120:2001:222::1111]:1234
DVTS Screenshot DVTS Site