I've seen (thanks to wireshark) in the SDP : "Media Attribute (a): rtpmap:96 MP4V-ES/5544"

You don't need to use wireshark to see this - you will also see it in the diagnostic output from "openRTSP".

Therefore, the server is telling you that the RTP timestamp frequency is 5544. This is very unusual, because a timestamp frequency of 90000 Hz is recommended, and used by everyone else (for MPEG-4 Video), as far as I know.

And my last question:
"the value jitter that is given in the stats (QoS stats) is the mean jitter?"

It's a weighted average, as described in RFC 3550, section A.8.
--

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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