> The purpose is to get from the client end the presentation time that was sent > by the server. > By now the client presentation time start from gettimeofday and will be > synchronized by the first RTSP Sender report.
You meant to say "RTCP Sender Report". But yes, that's correct. > what I would like to have is the NTP time that is in RCTP (I always ask > myself why this time is not in the RTP header !) I agree. This is a flaw in the design of RTP, IMHO. To save space in the RTP header, the protocol's designers decided that each RTP packet would contain only a 32-bit timestamp. Then, because 32 bits is not enough to convey a full presentation time, they added this convoluted mechanism whereby a separate control protocol (RTCP) would be used to map the 32-bit RTP timestamp into a full (64-bit) presentation time. But this means that - until the first RTCP "SR" packet is received by the client (i.e., in our code, before "RTPSource::hasBeenSynchronizedUsingRTCP()" returns True) - the client does not (and cannot) know the server's presentation time, and has to 'guess' it. (The RTSP "RTP-Info" information does *not* give you this; it gives you 'normal play time', which is different.) Sorry. Ross Finlayson Live Networks, Inc. http://www.live555.com/
_______________________________________________ live-devel mailing list [email protected] http://lists.live555.com/mailman/listinfo/live-devel
