[gst-devel] RTP clocking issue

[Zeeshan Ali]

Hello everyone,
   As most of you people are already aware that we need to have some
mechanism to sync the clocks of the sender and receiver in an RTP
session. A typical simple RTP pipeline looks something like:

sender: alsasrc ! SOMECODEC_encoder ! SOMECODEC_payloader ! rtpbin
receiver: rtpbin ! SOMECODEC_depayloader ! SOMECODEC_decoder ! alsasink

   Here are some thoughts and the problems with these thoughts:

1. Implement a clock in the rtpbin/depayloader, based on the
timestamps on the packets received and the system-clock. The problem
with this approach is when we use the rtpbin in full-duplex mode, like
this: alsasrc ! SOMECODEC_encoder ! SOMECODEC_payloader ! rtpbin !
SOMECODEC_depayloader ! SOMECODEC_decoder ! alsasink
 . Now in this case, gstreamer will pick-up the clock of the alsasrc
instead of rtpbin an therefore our solution wont work out.

2. Make the rtpbin/depayloader translates the timestamps on the
packets according to the pipeline clock, *somehow* ? I dont know if
that is possible or not and how. So please throw some light on this
one.

3. Any other suggestion?

--
Regards,
Zeeshan Ali