Almost there, but I still have one problem.
On my server, I launch vlc as follows:
vlc --intf telnet --cr-average 1000 --vlm-conf
/usr/local/etc/videolan/vlc/vlc.cfg &
My vlc.cfg has:
new livetv broadcast enabled
setup livetv input pvr:// --cr-average 1000
setup livetv output #standard{mux=ts,access=udp,url="224.0.0.1"}
control livetv stop