Re: [AVT] Non-compound RTCP

[Randell Jesup <rjesup at wgate.com>]

"Ingemar Johansson S" <ingemar.s.johansson at ericsson.com> writes:
>> > Personally I am more in favor or version 2) above as it is more in
>> > line with how the feedback messages can be stacked in RFC4585 and in
>> > the codec control messages draft... with the disclaimer that single
>> > messages are preferred.

I prefer 2 also, though I can certainly live with either.

>> The words "single messages are to be preferred" could mean that you
>> prefer to have only 1 RTCP packet per UDP packet, or that you prefer to
>> have as many RTCP packets per UDP packet as you can given space and
>> timing constraints. I certainly hope you mean the latter.
>
>Sorry for the very weak formulation, actually I my preference is for
>single messages in each RTCP with the purpose to keep the total size of
>the non-compound RTCP as small as possible. The reasons behind this
>preference is to be found in section 3 in  

>http://tools.ietf.org/html/draft-ietf-avt-rtcp-non-compound-03

>That said, I am not a very religious guy, I believe that it may be
>possible to allow for multiple messages in a non-compound RTCP but then
>one must keep in mind that the whole idea with non-compound RTCP
>diminishes as the size ratio between compound and non-componud RTCP
>decreases with the number of feedback messages. 

Right. The idea behind non-compound is to reduce the size of the messages
by not sending items you don't *need* to send.  If you have multiple things
to send, then (maybe) it makes more sense to send one packet with multiple
things than N packets with one thing.  You still don't want to send stuff
that there's no purpose for, and SR/RR/SDES don't need to be sent more
often than in RFC 3550/etc.

-- 
Randell Jesup, Worldgate (developers of the Ojo videophone), ex-Amiga OS team
rjesup at wgate.com
"The fetters imposed on liberty at home have ever been forged out of the weapons
provided for defence against real, pretended, or imaginary dangers from abroad."
		- James Madison, 4th US president (1751-1836)

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