[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [AVT] I-D ACTION:draft-ietf-avt-ulp-12.txt

On 25 Oct 2005, at 12:50, 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		: An RTP Payload Format for Generic FEC
	Author(s)	: A. Li
	Filename	: draft-ietf-avt-ulp-12.txt
	Pages		: 41
	Date		: 2005-10-25
	
This document specifies a payload format for generic Forward
   Error Correction (FEC) for media data encapsulated in RTP. It is
   based on the exclusive-or (parity) operation, and it is a
   generalized algorithms that includes Uneven Level Protection
   (ULP). The payload format described in this draft allows end
   systems to apply protection using arbitrary protection lengths
   and levels, in addition to using arbitrary protection group
   sizes. It enables complete recovery or partial recovery of the
   critical payload and RTP header fields depending on the packet
   loss situation. This scheme is completely backward compatible
   with non-FEC capable hosts. Those receivers that do not know
   about FEC can simply ignore the protection data. This
   specification obsoletes RFC 2733 and RFC 3009.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-avt-ulp-12.txt


I have two minor comments:

1) Sections 13.1, 13.2, 13.3 and 13.4 state "Required Parameters: none" and "Optional parameters: none", then define some parameters. This should be corrected, and the indentation in those sections fixed.

2) Could you please add an example of ULP FEC using RFC 2198 redundant coding to section 10? It's not entirely obvious how this mode is used.

Otherwise, this looks good to me.

Colin

_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
https://www1.ietf.org/mailman/listinfo/avt