Rtp absolute timestamp

[dv]

On 04/13/2012 12:21 PM, Pazzo Da Legare wrote:
> Dear All,
>
> I'm playing with a rtp souce with a pipeline as
>
> gst-launch  udpsrc port=6666 multicast-group=224.1.0.1
> caps="application/x-rtp" ! gstrtpjitterbuffer latency=200  !
> rtpmp4vdepay ! ffdec_mpeg4 ! autovideosink
>
> Is there a way to have an absolute time for the GstBuffer instead of a
> relative time?
>
> I had a look at
>
> static GstClockTime
> calculate_skew (RTPJitterBuffer * jbuf, guint32 rtptime, GstClockTime time,
>      guint32 clock_rate)
>
> and I thought the estimation would be an absolute time rather a relative one.
>
> Thank you for your help,
>
> pz
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You might need RTCP for that.
http://www.cs.columbia.edu/~hgs/rtp/faq.html#sr-timestamp 
<http://www.cs.columbia.edu/%7Ehgs/rtp/faq.html#sr-timestamp>