[vlc] can vlc recognize rtp video stream?

[jogging song]

Hi,
    I send a rtp video stream to vlc, and hope that vlc recognize the stream
type from rtp playload type and begin to
decode the stream. The RTP of H.263 and MPEG4 obeys the corresponding
RFC.Itry it and find vlc doesn't work.
In the website of vlc, the features say that vlc supports RTP/UDP unicast
and UDP/RTP multicast. what does it mean?
In the forum, I learn that a sdp is needed, I'm not sure.
Can anyone help me?
Thanks.

Best regards
jogging
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