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

[PROMONET Michel]

                Hi Ross,

I know you already answer to previous tries to find a way to have a presentation time in the client (before the RTCP report) that is based on RTSP server information and not on RTSP client current time.
I 'm just looking for a way to initialize the presentation time (the NTP time) not the normal play time from information coming from the RTSP server.

To clarify our context, we are using live555 to re-stream data that are recorded, then timestamps are not linked to current client time.
So the estimation of presentation based on current time before receiving RTCP "SR"  is really not accurate...

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.

As I told you, our actual hack is to use RTSP GET_PARAMETER to send this information in a non standard way.
Ok perhaps I have to accept this !

Best Regards,

                Michel.

[@@ THALES GROUP INTERNAL @@]

De : live-devel-bounces at ns.live555.com [mailto:live-devel-bounces at ns.live555.com] De la part de Ross Finlayson
Envoyé : lundi 18 mars 2013 14:05
À : LIVE555 Streaming Media - development & use
Objet : Re: [Live-devel] Synchronize the "RTCP" time using RTSP Range ?

I'm not sure specifically what you're asking, but as I've said (many times) before, the presentation times that are delivered at the receiver end *will* be synchronized, when (and only when) the first RTCP "SR" is received.

The "RTP-Info" information is different - it helps the receiver get the 'normal play time' (think: the time that would be shown on a VCR display) after the "PLAY".

The client code is working just fine.  There is nothing to 'fix'.

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

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