[Bug 746543] rtpsession: Properly implement T_rr_interval and allow sending multiple early feedback packets in a row

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746543

--- Comment #15 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Olivier Crête from comment #14)
> (In reply to Sebastian Dröge (slomo) from comment #13)
> > We only don't consider the UDP/IP packet overhead in the calculations.
> 
> I'm not sure if there is a way to do that automatically, maybe we should add
> a "packet-overhead" property to rtpsession and default to the size of
> ipv4+udp header. Maybe libnice should export the value, as it knows if TURN
> is used, and if ipv4 or ipv6 are used, and nicesrc could push it downstream
> as a custom sticky event. Or maybe it doesn't matter and a fixed number is
> enough.

My guess that it doesn't matter that much, because the RTP packets will also
have this overhead. It's a bit less (in percentage) than for RTCP (RTP packets
usually are a bit bigger) though.

We'll see if it matters :)

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