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When using H.264 in a point to point session (bidirectional) some kind of media negotiation has to be performed. But, could the two streams have different characteristics, such as different profiles/levels etc.? After all, encoder and decoder are independent and it makes sense for them to be able to deal with different parameter sets.
The h.264 metadata can be found in-band or out of band.
if you are using rtsp to receive the stream you can find the data in the rtsp negotiation (see http://www.ietf.org/rfc/rfc2326.txt).
You also need to parse the rtp packets and see if there is some more data there (see “How to fragment H264 Packets in RTP compliant with RFC3984”.