[Live-devel] How to disable RTCP timestamp calculations on single-stream sessions? [OpenRtspClient]

[Novalis Vapuru]

Thanks...

You are right It is not a good idea to ignore RTCP corrections...

I have no problem with viewing...I just push incoming streams [ since
they are from real time ip camera ] to decoder than viewer, I can see
the video
Since my rtsp source is in real time i do not insert any time-stamp or
presentation time before sending them to decoder...

My timestamps problems start when i try to write them to
MP4[container]  file using an  MP4 muxer...
Because of MP4 container format i have set their presentation time to
muxer otherwise i have a broken MP4 file...

so first i calculate firstPresentationTime

TIMEVAL_TO_REFERENCE_TIME(presentationTime); // at first frame[key frame]

then push muxer  other frames time stamps as follow

TIMEVAL_TO_REFERENCE_TIME(presentationTime) - firstPresentationTime;


Jeremy Noring warn me about my  TIMEVAL_TO_REFERENCE_TIME so i fixit
:(there is overflow) as

#define TIMEVAL_TO_REFERENCE_TIME(x) (((__int64)x.tv_sec * 1000000) +
x.tv_usec) * 10

For now it seems to work in a correct way...

But anyway if anybody write h264 stream to MP4 container using a MP4
muxer, i will like to hear their advices about timestamps
calculations.

Best Wishes

2011/12/22 Ross Finlayson <finlayson at live555.com>:
> My RTSP Source's  RTCP SR  are not reliable...
>
>
> You are probably mistaken.
>
> So calculated timestamps frequently resulting in large negative jumps.
>
>
> Let me guess: You're receiving H.264 (or MPEG) video that uses "P"
> (prediction) frames.  For video streams like this, frames are sent (and thus
> received) in 'decoding order' - i.e., the order that they will be fed to a
> decoder, not 'presentation order' - the order that they will be displayed on
> the screen.  In this case, it is normal (and expected) that the received
> frames' presentation times will not all be monotonically increasing.  The
> incoming frames should be fed into your decoder in the order that they
> arrive, but their presentation times will tell you when they should be
> displayed.
>
> But in any case, RTCP is an important part of the RTP/RTCP protocol, and
> should not be disabled.
>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
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