[Live-devel] hasBeenSynchronizedUsingRTCP()

[Jeff Shanab]

Thanks that explains it, the last firmware upgrade allows us to disable audio.

The PTS still jumps even for video only, do I need to explicitly request sync of the video stream when I only want video?

One last question, does sync offset the PTS and allow it to appear as if it is the same ntp stamp as the receiver?

From: live-devel-bounces at ns.live555.com [mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Friday, July 29, 2011 9:56 AM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] hasBeenSynchronizedUsingRTCP()


On Jul 29, 2011, at 10:09 AM, Jeff Shanab wrote:


While I thought this was working before for me it is definitely always returning false at the moment.  I am trying to track this down to see what I may have done to break this but I cannot figure out how the variable it returns ever gets set.  It is constructed false and passed on in each MultiFramedRTPSource::doGetNextFrame1().

So how does this get set?

It gets set by the RTP receiving code, when it receives RTCP "SR" packets.

If, however, the RTP receiving code doesn't receive any RTCP "SR" packets (e.g., because the sender does not implement RTCP), then "hasBeenSynchronizedUsingRTCP()" will never return True.


Rtsp connected to H264 stream from a security camera. Stream plays fine in VLC, recorded video is ok, but never ever syncs and I wanted to use that sync to trigger the beginning of recording .

Does your camera stream audio as well as video?  If it streams only video, then I'm not sure what 'syncs' could mean.

If, however, your camera streams both audio and video, then it must implement RTCP, otherwise receiving client will never be able to synchronize audio and video.

So in short: Does your camera send RTCP packets?

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

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