Subject: [AVT] comments on draft-ietf-fecframe-dvb-al-fec-02.txt

From: zouzixuan <[email-masked]>
Date: Sun, 30 Aug 2009 12:10:16 +0800

Hi, All
	The followings are my comments on
draft-ietf-fecframe-dvb-al-fec-02.txt:
	Page 6, in SSRC item: " It is RECOMMENDED that the DVB AL-FEC
protocol uses this mechanism for explicit SSRC signaling"
			Doe it make sense to use the keyword "RECOMMEDED"
within the scope of IETF to guide the way of using SSRC for AL-FEC protocol
specified in DVB? 

			".....the sender does not have to select a random
initial sequence number for the FEC stream as suggested by [RFC3550]."
					Using a static sequence number
certainly had no problem and is merely a implementation issue. So why not
just let it be random to be fully compatible with RFC3550 . These words
seems to be redundant.
	
	Page 9   "... Due to the lack of the format parameters, it is not
possible to learn the FEC parameters from the SDP description. This severely
limits the ability of using multiple FEC streams that are generated with
different settings. "
				Agree with this argument. This might be
taken into account for more flexible usage if a new RTP profile for AL-FEC
were brought up.

Best,
Zou ZiXuan, Senior Research Staff
Media & Communication Lab
HUAWEI TECHNOLOGIES CO.,LTD. 

Address: Huawei Industrial Base
Bantian Longgang
Shenzhen 518129, P.R.China
Tel: +86 0755 28789364
Fax: +86 0755 28788317
E-mail: [email-masked]
www.huawei.com
----------------------------------------------------------------------------
---------------------------------------------------------
This e-mail and its attachments contain confidential information from
HUAWEI, which 
is intended only for the person or entity whose address is listed above. Any
use of the 
information contained herein in any way (including, but not limited to,
total or partial 
disclosure, reproduction, or dissemination) by persons other than the
intended 
recipient(s) is prohibited. If you receive this e-mail in error, please
notify the sender by 
phone or email immediately and delete it!