> Is there any reference or commonly cited material about how these values are calculated?
"The RTP timestamp represents the sampling instant of the first octet of data in the frame. It starts from a random initial value and increments at a media-dependent rate." >From "RTP, Audio and Video for the Internet", Colin Perkins, 2003, ISBN: 0-672-32249-8 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Burns Sent: Thursday, August 07, 2008 3:32 AM To: [EMAIL PROTECTED] Subject: [Live-devel] Calculating rtptime for RTSP/PLAY-Response "RTP-Info" header Hi all, I'm trying to figure out how to calculate the RTPTime values in the RTSP/PLAY-Response "RTP-Info" header, based on an incoming live RTP/RTCP stream(s) from a live encoder. I've pulled apart an HUSM packet dump and the critical section looks something like this: 769: RTCP-SR/9301 from LENC NTP: MSW: 3403825895 (0xcae242e7); LSW: 133143986 (0x07ef9db2) ==> Nov 12, 2007 03:11:35.0310 UTC RTP: 670943030 803: RTCP-SR/9303 from LENC NTP: MSW: 3403825896 (0xcae242e8); LSW: 64424509 (0x03d70a3d) ==> Nov 12, 2007 03:11:36.0150 UTC RTP: 383790848 840: RTCP-SR/9301 from LENC NTP: MSW: 3403825897 (0xcae242e9); LSW: 64424509 (0x03d70a3d) ==> Nov 12, 2007 03:11:37.0150 UTC RTP: 671123120 871: RTSP/PLAY-Request from CLIENT 881: RTCP-SR/9303 from LENC NTP: MSW: 3403825898 (0xcae242ea); LSW: 64424509 (0x03d70a3d) ==> Nov 12, 2007 03:11:38.0150 UTC RTP: 383834926 882: RTCP-SR/3457 to CLIENT Same as 881 906: RTCP-RR/3457 from CLIENT 919: RTCP-SR/9301 from LENC NTP: MSW: 3403825899 (0xcae242eb); LSW: 133143986 (0x07ef9db2) ==> Nov 12, 2007 03:11:39.0310 UTC RTP: 671303570 920: RTCP-SR/9301 to CLIENT Same as 919 921: RTP/9302 from LENC Seq: 39932 RTP: 383841717 922: RTP/3456 to CLIENT Same as 921 923: RTP/9300 from LENC Seq: 59095 RTP: 671369087 924: RTP/9302 from LENC Seq: 39933 RTP: 383842741 925: RTSP/PLAY-Response to CLIENT RTP-Info: url=rtsp://172.28.15.239/rtpencoder/Blah.sdp/streamid=1;seq=39932;rtptime=38 3841717, url=rtsp://172.28.15.239/rtpencoder/Blah.sdp/streamid=0;seq=59095;rtptime=67 1239890 926: RTP/3458 to CLIENT Seq: 59095 RTP: 671369087 927: RTP/3456 to CLIENT Seq: 39933 RTP: 383842741 How in the world did HUSM come up with "rtptime=671239890"????? Is there any reference or commonly cited material about how these values are calculated? Thanks in advance, ChrisB Chris Burns M: +64 21 391 286 [EMAIL PROTECTED]
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