Re: [AVT] I-D ACTION:draft-ietf-avt-rtp-h264-05.txt

[philippe.gentric at philips.com]

AVTers, authors,

I have found this draft pretty advanced, I have a few questions

there is the text related to parameter sets that I do not fully understand,
it is distributed across 1.2 (which is fine) and 6.1 at 8.4
and I suspect section 6.1 needs to be revisited/merged
due to the new dedicated section 8.4 ?

both in section 6.1 and section 8.4 there is the concept of:

"an RTP session whose parameter sets were already changed by control protocol messages during the lifetime of the RTP session"

Now apart from the fact that there seem to be a duplication here between 6.1 and 8.4,
I have to admit this got me a headache to understand (and actually I am not sure I got it ?)

Can we strcuture this a bit by explaining that there are 3 ways to send parameters sets:

(1) out of band before RTP session starts

(2) out of band during RTP session

(3) in band (of course, during RTP session)

If yes , Would it be possible that what you want to express is that:

(A) parameter sets are transmitted using either (1) or (3) or (1+2) or (1+3),

(B) (1) and (1+2) are the RECOMMENDED way to do it

(C) (3) and (1+3) are only for some specific applications and are NOT RECOMMENDED

(D) in all cases (2) and (3) MUST NOT be used together in the same session

Is this is what you wanted to express ?

regards,

PS: in section 8.4 there is a typo in the word "specificaion"


Philippe Gentric
Chief Architect
Philips Software
philippe.gentric@philips.com
http://www.software.philips.com


                                                                                                                                       
                                                                                                                                       
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                                                   Subject:    [AVT] I-D ACTION:draft-ietf-avt-rtp-h264-05.txt                         
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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 H.264 Video
             Author(s)         : S. Wenger, et al.
             Filename          : draft-ietf-avt-rtp-h264-05.txt
             Pages                         : 68
             Date                    : 2004-4-26

This memo describes an RTP Payload format for the ITU-T
Recommendation H.264 video codec.  This codec was designed as a
joint project of the Video Coding Experts Group (VCEG) of ITU-T and
the Moving Picture Experts Group (MPEG) of ISO/IEC.  Recommendation
H.264 was approved by ITU-T on May 2003, and the approved draft
specification is available for public review.  ISO/IEC
International Standard 14496-10 will be technically identical to
ITU-T Recommendation H.264.

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