[Bug 731769] add element implementing the ONVIF RTP extension

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731769
  GStreamer | gst-plugins-bad | unspecified

--- Comment #13 from Olivier Crête <olivier.crete at ocrete.ca> 2014-11-25 20:23:39 UTC ---
The current element creates a NTP time that matches the NTP time used in rtcp
only if "use-pipeline-clock" property is enabled on the rtpbin. Otherwise, if
the pipeline clock and system clocks have different speeds, they will slowly
drift apart. As the NTP timestamps in the ONVIF RTP header extension is based
on the pipeline clock (the buffer timestamps). That said, unless the thing runs
for a very lonig time, it's probably not a huge problem. I guess we could re-do
the matching for every buffer (or for every N buffers) to avoid this problem if
it becomes an issue.

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