>As RTCP SR packets carry NTP ans RTP timestamps I would like to know how >they are used to sync to streams.
As described in RFC 3550. > I found out that the RTP timestamp in >the RTCP SR corresponds to the timevalue which the NTP timestamp indicates. > >But why can't I find the RTP timestamp in the packets of my videostream? Because they're not useful to you. I'll say this yet again (and hopefully for the last time): Our RTP/RTCP implementation automatically computes synchronized presentation times using RTP timestamps and RTCP reports. Code that receives a RTP stream (using our library) should never have to look at RTP timestamps. Instead, just use the presentation time. If you are also using RTCP (which you should be), then the presentaton time *will* be properly synchronized. >What leads me to this problem is the question, how I can keep a video >stream synchronised to an audio stream when I manipulate the video >stream on its way to the final recipient (i.e. transcoding it)? Just make sure that frames of the transcoded stream get correct presentation times (and that you create a new "RTCPInstance" object for the new outgoing stream). -- Ross Finlayson Live Networks, Inc. http://www.live555.com/ _______________________________________________ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
