First, let's make sure that we're talking about the same thing. I
assume that you're referring to the way that our RTSP *server*
implementation fills in the "RTP-Info:" header that it includes in
the response to each RTSP "PLAY" request. If you're instead
referring to something else, then please correct me.
The crux of my question concerns the *delta* that a reference
implementation (Helix USM) applies to one of the rtptime=X values
that is reported in the RTP-Info header. All of our testing (with
~30 different brand/model combinations) has shown that this is
critical for many mobile phones to correctly apply A/V sync.
What exactly is this 'delta', and which RFC (or Internet-Draft)
document defines it?
The live555 code (the 2008.07.25 release) does not adjust (calculate
a delta) the RTP-Info header in this way. It simply reports the
seqNum & rtptime of the first packet on each stream.
I believe that the information that we put in the "RTP-Info:" header
is correct. It is the information defined in section 12.33 of RFC
2326 (the RTSP specification).
--
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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