How to stream without transcode

[firehair]

Hi everyone i have a some question

I have a video file at my media server how to streaming that file by multicast to multi vlc client
by just get the video and then stream it without transcode or do anything with a file
by use a command line
because i want to save my CPU

This is my command

vlc -I dummy http://myserver/mediafile.flv --sout '#rtp{mux=ts,dst=239.255.12.42,sdp=sap,name="TestStream"}'

but it not work did I do any thing wrong

Thank you for your help and sorry for my poor english

[ILEoo]

Your flv-file could contain video/audio codecs that vlc doesn't know howto include in ts-mux (or aren't even defined to be muxable in ts).