[Live-devel] Synchronize the "RTCP" time using RTSP Range ?

[Ross Finlayson]

> What I was suggesting is this “missing” NTP information (before RTCP “SR”) could perhaps be computed from RTSP PLAY answer.
> It is quite annoying to drop data waiting for RTCP “SR” because we cannot send the timestamp through RTSP/RTP/RTCP mechanism.

What I can probably do is upgrade our server code so that it sends a RTCP "SR" packet immediately upon handling a "PLAY" command (before the first RTP packet is sent).  (I think this is actually prescribed in one of the IETF RFCs.)  That won't be 100% reliable (because this first RTCP packet may get lost, but most of the time it will eliminate the delay before RTCP synchronization occurs.

Yes, it would be nice if the "RTP-Info:" data included a NTP-format time (the same as in RTCP "SR"s), but unfortunately that's not in the standard.


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

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