Re: [AVT] comments on draft-ietf-avt-rtp-speex-05.txt

[Alex Eleftheriadis <alex at vidyo.com>]

Given that the Speex bitstream is "embedded", in the sense that  
narrowband bitstreams are embedded in wideband bitstreams, has there  
been any thought on allowing each bitstream component to be  
transported over its own RTP session?

The structure appears similar - if not identical - to scalable  
coding, such as H.264 SVC, for which an RTP payload format is  
currently being developed. By separating the layers into their own  
RTP sessions, one can take advantage of the scalability of the codec  
in obvious ways (e.g., receive only the streams that can/is willing  
to decode, works nicely in a multicast environment, can use different  
protection for the narrowband component, etc.).

I looked in the avt list archives going back quite a while, but did  
not find any discussion on this.

--
Alex Eleftheriadis
alex at vidyo.com


On Feb 28, 2008, at 7:57 AM, Aymeric Moizard wrote:

>
> Hi all,
>
> We've delivered a new draft for speex codec recently.
>
> Following previous comments, the SDP usage part and
> sample have been improved: more details and examples
> have been provided.
>
> We do think this document is complete and hope to
> have any comments!
>
> tks,
> Aymeric MOIZARD / ANTISIP
> amsip - http://www.antisip.com
> osip2 - http://www.osip.org
> eXosip2 - http://savannah.nongnu.org/projects/exosip/
>
>
> On Sat, 16 Feb 2008, Internet-Drafts at ietf.org wrote:
>
>> A New Internet-Draft is available from the on-line Internet-Drafts  
>> directories.
>> This draft is a work item of the Audio/Video Transport Working  
>> Group of the IETF.
>>
>>
>> 	Title           : RTP Payload Format for the Speex Codec
>> 	Author(s)       : G. Herlein, et al.
>> 	Filename        : draft-ietf-avt-rtp-speex-05.txt
>> 	Pages           : 23
>> 	Date            : 2008-02-16
>>
>> Speex is an open-source voice codec suitable for use in Voice over IP
>> (VoIP) type applications.  This document describes the payload format
>> for Speex generated bit streams within an RTP packet.  Also included
>> here are the necessary details for the use of Speex with the Session
>> Description Protocol (SDP).

[snip]

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