Video Jack.
Moved [[http://www.piksel.no/pwiki/VideoJack|here]]
with the technology and protocols available nowadays video jack would be an rtp server(and even rtsp), maybe with rtcp to sync stream as the jackd transport, using sap to connect to it. the problem would be the format used in order to get rid of bandwidth and cpu problems (rgb? yuv? light huffman compression?)
As for sap server there is minisap server from videolan guys.
for rtp there's live.com or the whole project fenice
Why rtp? because it's the Real Time Protocol!
Why http://wiki.videolan.org/index.php/RTCP rtcp]? rtcp to have quality information about the stream
Why sap?
because it's the Session Announcement Protocol and can use multicast.
Why rtcp?
because it's the Real-Time Streaming Protocol