Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtext-framemarking-08.txt

From: Magnus Westerlund <[email-masked]>
Date: Tue, 23 Jul 2019 21:21:09 +0000

Hi,

Yes, the -09 does address my two issues I noticed on -08.

/Magnus

> -----Original Message-----
> From: avt <[email-masked]> On Behalf Of Magnus Westerlund
> Sent: den 29 mars 2019 04:11
> To: Mo Zanaty (mzanaty) <[email-masked]>
> Cc: [email-masked]; [email-masked]
> Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtext-framemarking-08.txt
> 
> Thanks,
> 
> This do address my comments.
> 
> /Magnus
> 
> 
> On 2019-03-28 22:54, Mo Zanaty (mzanaty) wrote:
> > Hi Magnus,
> >
> > Version 09 addresses your two issues below. Please review and confirm
> > if this resolves all your issues.
> >
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-avtext-framemarking-09
> >
> >
> > Thanks,
> > Mo
> >
> > -----Original Message-----
> > From: mzanaty <[email-masked]>
> > Date: Friday, November 9, 2018 at 4:25 PM
> > To: 'Magnus Westerlund' <[email-masked]>,
> "[email-masked]"
> > <[email-masked]>, "[email-masked]"
> > <[email-masked]>
> > Subject: Re: [AVTCORE] I-D Action:
> > draft-ietf-avtext-framemarking-08.txt
> > Resent-From: <[email-masked]>
> > Resent-To: mzanaty <[email-masked]>, Espen Berger
> > <[email-masked]>, <[email-masked]>
> > Resent-Date: Friday, November 9, 2018 at 4:25 PM
> >
> > Hi Magnus,
> >
> > For clarity, we will add diagrams for the long header format when any
> > fields are omitted.
> > (L=1 when TL0PICIDX is omitted, and L=0 when both LID and TL0PICIDX
> > are omitted).
> >
> > Thanks,
> > Mo
> >
> > -----Original Message-----
> > From: avt <[email-masked]> on behalf of 'Magnus Westerlund'
> > <[email-masked]>
> > Date: Tuesday, November 6, 2018 at 2:49 AM
> > To: "[email-masked]" <[email-masked]>,
> > "[email-masked]"
> > <[email-masked]>
> > Subject: Re: [AVTCORE] I-D Action:
> > draft-ietf-avtext-framemarking-08.txt
> >
> > Hi,
> >
> > I have reviewed the changes and have some comments below. Otherwise
> > thanks for addressing my comments.
> >
> > 1. Section 3.1:
> >
> > Note that this SHOULD match the RTP header
> >       marker bit when the latter is reliable.
> >
> > So, should this really be a capital SHOULD? First it appears to be an
> > informative note. Secondly, video payload formats has so far used the
> > marker bit to indicate last packet of a frame/field (for interleaved).
> > But, that doesn't preclude that a future format would depart from the
> > convention. Thus, some rewording may be suitable.
> >
> > 2. Section 3.2
> >
> > One issue was not resolved from my previous comment:
> >
> > The ID is assigned per [RFC8285],
> >    and the length is encoded as L=2 which indicates 3 octets of data.
> >
> >     0                   1                   2                   3
> >     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >    |  ID=? |  L=2  |S|E|I|D|B| TID |   LID         |    TL0PICIDX  |
> >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> >    o  LID: Layer ID (8 bits) - Identifies the spatial and quality layer
> >       encoded, starting with 0 and increasing with higher fidelity.  If
> >       no scalability is used, this MUST be 0 or omitted to reduce
> >       length.  When omitted, TL0PICIDX MUST also be omitted.
> >
> > The issue I see with the LID text is that they it says that the LID
> > field and the TL0PICIDX can be omitted, and thus have a shorter header.
> > To allow for this, one need to change the upper part for the long
> > header and the allowed values for the L field can be either 0 or 2.
> >
> > Cheers
> >
> > Magnus
> >
> >
> > On 2018-10-24 02:19, [email-masked] 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 Core
> >> Maintenance WG of the IETF.
> >>
> >>         Title           : Frame Marking RTP Header Extension
> >>         Authors         : Mo Zanaty
> >>                           Espen Berger
> >>                           Suhas Nandakumar
> >> 	Filename        : draft-ietf-avtext-framemarking-08.txt
> >> 	Pages           : 12
> >> 	Date            : 2018-10-23
> >>
> >> Abstract:
> >>    This document describes a Frame Marking RTP header extension used to
> >>    convey information about video frames that is critical for error
> >>    recovery and packet forwarding in RTP middleboxes or network nodes.
> >>    It is most useful when media is encrypted, and essential when the
> >>    middlebox or node has no access to the media decryption keys.  It is
> >>    also useful for codec-agnostic processing of encrypted or
unencrypted
> >>    media, while it also supports extensions for codec-specific
> >>    information.
> >>
> >>
> >> The IETF datatracker status page for this draft is:
> >> https://datatracker.ietf.org/doc/draft-ietf-avtext-framemarking/
> >>
> >> There are also htmlized versions available at:
> >> https://tools.ietf.org/html/draft-ietf-avtext-framemarking-08
> >> https://datatracker.ietf.org/doc/html/draft-ietf-avtext-framemarking-
> >> 08
> >>
> >> A diff from the previous version is available at:
> >> https://www.ietf.org/rfcdiff?url2=draft-ietf-avtext-framemarking-08
> >>
> >>
> >> Please note that it may take a couple of minutes from the time of
> >> submission until the htmlized version and diff are available at
> >> tools.ietf.org.
> >>
> >> Internet-Drafts are also available by anonymous FTP at:
> >> ftp://ftp.ietf.org/internet-drafts/
> >>
> >> _______________________________________________
> >> Audio/Video Transport Core Maintenance [email-masked]
> >> https://www.ietf.org/mailman/listinfo/avt
> >>
> 
> --
> 
> Magnus Westerlund
> 
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