
From nobody Wed Jul  6 12:47:03 2016
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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 Extensions of the IETF.

        Title           : RTP Stream Identifier Source Description (SDES)
        Authors         : Adam Roach
                          Suhas Nandakumar
                          Peter Thatcher
	Filename        : draft-ietf-avtext-rid-05.txt
	Pages           : 8
	Date            : 2016-07-06

Abstract:
   This document defines and registers two new RTCP SDES items.  One,
   named RtpStreamId, is used for unique identification of RTP streams.
   The other, RepairedRtpStreamId, can be used to identify which stream
   a redundancy RTP stream is to be used to repair.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-avtext-rid/

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From nobody Wed Jul  6 12:48:46 2016
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Subject: Re: [avtext] RID needs proper header extension registrations
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Sorry this took so long to get around to. I think I've added the 
appropriate text to -05. Please let me know if you think anything 
additional is needed.

/a

On 6/22/16 11:09, Jonathan Lennox wrote:
> Hi, Adam —
>
> I realized on writing up the PubReq for RID that it needs proper registration for the sdes-hdr-ext items — we need to mention the SDES header extension IANA registry, explicitly state the URNs implementations should use, etc.
>
> See the discussion of MID on MMUSIC in the last few days.
>
> It probably needs more explanation of the privacy and timeliness considerations for the SDES items, too, as Magnus pointed out for MID.
>
> Sorry I didn’t catch this sooner.
>
> -Jonathan
>


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From nobody Thu Jul  7 09:45:13 2016
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Changed milestone "Submit Mechanism for Identifying Encoded and
Dependent Streams for Proposed Standard", resolved as "Done".

URL: https://datatracker.ietf.org/wg/avtext/charter/


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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 Extensions of the IETF.

        Title           : The Layer Refresh Request (LRR) RTCP Feedback Message
        Authors         : Jonathan Lennox
                          Danny Hong
                          Justin Uberti
                          Stefan Holmer
                          Magnus Flodman
	Filename        : draft-ietf-avtext-lrr-03.txt
	Pages           : 14
	Date            : 2016-07-08

Abstract:
   This memo describes the RTCP Payload-Specific Feedback Message "Layer
   Refresh Request" (LRR), which can be used to request a state refresh
   of one or more substreams of a layered media stream.  It also defines
   its use with several RTP payloads for scalable media formats.


The IETF datatracker status page for this draft is:
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Cg==


From nobody Sat Jul  9 06:55:02 2016
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Subject: [avtext] Stephen Farrell's No Objection on draft-ietf-avtext-splicing-notification-08: (with COMMENT)
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Stephen Farrell has entered the following ballot position for
draft-ietf-avtext-splicing-notification-08: No Objection

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COMMENT:
----------------------------------------------------------------------


Thanks for handling my discuss points. 

Old comments below, I didn't check those.

-----

- I agree with Alia's discuss, but suspect the ship has sailed.
(Sadly IMO, but sailed nonetheless.)

- The security considerations here are similar to but not quite
the same as those in RFC6828 which I think was the last time a
similar document was before the IESG. I wondered if those
differences were significant or not, it might be no harm to
commpare the two (if that's not already been done) since they
really ought be pretty much the same.



From nobody Tue Jul 12 08:00:57 2016
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To: "avtext@ietf.org" <avtext@ietf.org>, "draft-ietf-avtext-rid@ietf.org" <draft-ietf-avtext-rid@ietf.org>
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Date: Tue, 12 Jul 2016 16:29:55 +0200
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Subject: [avtext] draft-ietf-avtext-rid-05: A couple of issues
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Hi,

Doing a review across the whole RID+RID and Simulcast document I have 
some significant comment on draft-ietf-avtext-rid-05. I am sorry I 
missed WGLC for this document. So please consider this early IETF last 
call comments.

1. The definition of the RepairedRtpStreamId in Section 3 is not 
particular clear on the limitations this design have. As the SDES item 
can only contain a single RtpStreamId value the implication is that 
RepairedRtpStreamId can only be used when the redundancy mechanism has a 
one to one relation with a source RTP stream. This can't be used with 
redundancy mechanisms that protects multiple RTP streams. I think this 
could be made clearer in Section 3.

2. Section 4.4:

Extension URI: urn:ietf:params:rtp-hdrext:sdes:repair-rtp-sream-id

Why is this URI not "Extension URI: 
urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-sream-id"?

3. Section 3.3 and 5:

I think the privacy considerations in the security consideration needs 
to be strengthen.

Section 3.3:
    Implementors are warned, in particular, not to include any
    information in the identifier that is derived from potentially user-
    identifying information, such as user ID or IP address.  To avoid
    identification of specific implementations based on their pattern of
    tag generation, implementations are encouraged to use a simple scheme
    that starts with the ASCII digit "1", and increments by one for each
    subsequent identifier.

Section 5:
    The actual identifiers used for RtpStreamIds (and therefore
    RepairedRtpStreamIds) are expected to be opaque.  As such, they are
    not expected to contain information that would be sensitive, were it
    observed by third-parties.


I think my main criticism is how section 5 is formulated. I think it 
could start out in the risks, as an SDES items can carry any UTF-8 
string that is not to long. Therefore the generation of the string is 
important so that it does not contain any privacy sensitive information.

I will also note that this fails to discuss the importance of the labels 
being possible to trust. Otherwise replacing the labels have interesting 
effects in the applications.

I would suggest for Section 5:

--- Start of proposed text ---

The SDES items has the potential to carry any UTF-8 string. Therefore it 
exists a risk that it carries privacy sensitive information. 
Implementations needs to take care when generating identifiers so that 
they do not contains information that can identify the user or allow for 
long term tracking of the device. Following the generation 
recommendations in Section 3.3 will result in non instance specific 
labels, with only minor fingerprinting possibilities in the total number 
of used RtpStreamIds and RepairedRtpStreamIds.

Even if the SDES items are generated to be as information less as 
possible, it is RECOMMENDED that the SDES items are encrypted to 
preserve privacy against third parties. The means encryption of both 
RTCP as well as the RTP header extension part.

As the SDES items are used for identification of the RTP streams for 
different application purposes, it is important that the intended values 
are received. An attacker, either a third party or malicious RTP 
middlebox, that removes, or exchanges the values for these SDES items 
can severely impact the application. The impact can include failure to 
decode or display the media content of the RTP stream, it can also 
result in incorrectly attribute media content to identifiers of the 
media source, such as the wrongly label the speaker. To prevent this 
from occurring due to third party attacks, integrity and source 
authentication is needed.

Options for Securing RTP Sessions [RFC7201] discusses options for how 
the encryption, integrity and source authentication can be accomplished.

--- End of proposed text ---

4. Section 3:

    This specification defines two new RTCP SDES items [RFC3550].  The
    first item is 'RtpStreamId', which is used to carry RTP stream
    identifiers within RTCP SDES packets.  This makes it possible for a
    receiver to associate received RTP packets (identifying the RTP
    stream) with a media description having the format constraint
    specified.

The definition of the RtpStreamId is missing a discussion of 
requiremetns on the value.

mmusic-rid document in Section 4 is indicating through the following line:

  A given
    "rid-id" MUST NOT be repeated in a given media description ("m="
    section).

 From my perspective I do wonder if the definition in this document 
needs to makes this clear. And also possibly make it clear that there 
exist no requirement for it be unique across all RTP streams in the RTP 
session, something the name may imply. This clearly also indicates that 
if one have multiple media sources that can use the same RtpStreamIds 
then one needs some additional mechanism to identify them. Media sources 
from different endpoints can be seperated using SDES CNAME.

So the main issue appears to exist in cases where one endpoint sends 
multiple media sources in the same RTP session, such as when BUNDLE is 
used.

See my review of draft-ietf-mmusic-rid for additional aspects of this on 
the a=rid side.

5. Section 3.

I think adding a sentence that SDES items are UTF-8 and have a maximum 
length of 255 Octets, and with a warning that as many symbols encoded in 
UTF-8 have multi-octet representations, the limit to the number of 
symbols that fits may be much lower than 255.

This as RFC3550 is not super clear on this implication, even if the 
limitations are clear when it comes to SDES items having a max length of 
255 octets.

Cheers

Magnus Westerlund

----------------------------------------------------------------------
Services, Media and Network features, Ericsson Research EAB/TXM
----------------------------------------------------------------------
Ericsson AB                 | Phone  +46 10 7148287
Frgatan 6                 | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------


From nobody Thu Jul 14 16:18:08 2016
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Subject: Re: [avtext] draft-ietf-avtext-rid-05: A couple of issues
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On 7/12/16 09:29, Magnus Westerlund wrote:
> 1. The definition of the RepairedRtpStreamId in Section 3 is not 
> particular clear on the limitations this design have. As the SDES item 
> can only contain a single RtpStreamId value the implication is that 
> RepairedRtpStreamId can only be used when the redundancy mechanism has 
> a one to one relation with a source RTP stream. This can't be used 
> with redundancy mechanisms that protects multiple RTP streams. I think 
> this could be made clearer in Section 3.

I'm not sure that's a limitation of the current design -- packet types 
are allowed to appear more than once, right? It seems that it would be 
reasonable to include more than one RepairedRtpStreamId SDES packet in a 
single compound packet, right? I agree that we need to say more about 
this, but the limitation you imply is necessary seems artificial.

I'm adding: "For those schemes in which a redundancy stream contains 
information used to repair more than one stream, multiple 
RepairedRtpStreamId SDES items may appear in a single compound packet. 
Due to the foregoing scoping rules, the RepairedRtpStreamId cannot be 
used to indicate streams in multiple sessions or with varying MIDs."


> 2. Section 4.4:
>
> Extension URI: urn:ietf:params:rtp-hdrext:sdes:repair-rtp-sream-id
>
> Why is this URI not "Extension URI: 
> urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-sream-id"?

Jetlag. I've fixed it.


> 3. Section 3.3 and 5:
>
> I think the privacy considerations in the security consideration needs 
> to be strengthen.
> ...
> I would suggest for Section 5:
>
> --- Start of proposed text ---
>
> The SDES items has the potential to carry any UTF-8 string. Therefore 
> it exists a risk that it carries privacy sensitive information. 
> Implementations needs to take care when generating identifiers so that 
> they do not contains information that can identify the user or allow 
> for long term tracking of the device. Following the generation 
> recommendations in Section 3.3 will result in non instance specific 
> labels, with only minor fingerprinting possibilities in the total 
> number of used RtpStreamIds and RepairedRtpStreamIds.
>
> Even if the SDES items are generated to be as information less as 
> possible, it is RECOMMENDED that the SDES items are encrypted to 
> preserve privacy against third parties. The means encryption of both 
> RTCP as well as the RTP header extension part.
>
> As the SDES items are used for identification of the RTP streams for 
> different application purposes, it is important that the intended 
> values are received. An attacker, either a third party or malicious 
> RTP middlebox, that removes, or exchanges the values for these SDES 
> items can severely impact the application. The impact can include 
> failure to decode or display the media content of the RTP stream, it 
> can also result in incorrectly attribute media content to identifiers 
> of the media source, such as the wrongly label the speaker. To prevent 
> this from occurring due to third party attacks, integrity and source 
> authentication is needed.
>
> Options for Securing RTP Sessions [RFC7201] discusses options for how 
> the encryption, integrity and source authentication can be accomplished.
>
> --- End of proposed text ---

Excellent. Thanks for sending text. I'm editing it slightly and 
replacing the entire security section with it.

> 4. Section 3:
>
>    This specification defines two new RTCP SDES items [RFC3550]. The
>    first item is 'RtpStreamId', which is used to carry RTP stream
>    identifiers within RTCP SDES packets.  This makes it possible for a
>    receiver to associate received RTP packets (identifying the RTP
>    stream) with a media description having the format constraint
>    specified.
>
> The definition of the RtpStreamId is missing a discussion of 
> requiremetns on the value.
>
> mmusic-rid document in Section 4 is indicating through the following 
> line:
>
>  A given
>    "rid-id" MUST NOT be repeated in a given media description ("m="
>    section).
>
> From my perspective I do wonder if the definition in this document 
> needs to makes this clear. And also possibly make it clear that there 
> exist no requirement for it be unique across all RTP streams in the 
> RTP session, something the name may imply. This clearly also indicates 
> that if one have multiple media sources that can use the same 
> RtpStreamIds then one needs some additional mechanism to identify 
> them. Media sources from different endpoints can be seperated using 
> SDES CNAME.

Yes, a discussion of scoping is certainly called for. I propose:

   RtpStreamId and RepairedRtpStreamId values are scoped by source 
identifier
   (e.g., CNAME) and by media session. When the media is multiplexed
   using the BUNDLE extension {{I-D.ietf-mmusic-sdp-bundle-negotiation}},
   these values are further scoped by their associated MID values.
   For example: an RtpStreamId of "1" may be present in the stream
   identified with a CNAME of "1234@example.com", and may also be
   present in a stream with a CNAME of "5678@example.org", and these
   would refer to different streams. Similarly, an RtpStreamId of "1"
   may be present with an MID of "A", and again with a MID of "B",
   and also refer to two different streams.

> 5. Section 3.
>
> I think adding a sentence that SDES items are UTF-8 and have a maximum 
> length of 255 Octets, and with a warning that as many symbols encoded 
> in UTF-8 have multi-octet representations, the limit to the number of 
> symbols that fits may be much lower than 255.

I would think that "make them as small as possible" and "use this 
approach that keeps them one character long" should be sufficient, but 
I'll add text just to be triple-sure.

   As with all SDES items, RtpStreamId and RepairedRtpStreamId are limited
   to a total of 255 octets in length. Since the values of these items
   are encoded with UTF-8, the use of multi-octet characters will result
   in limitations smaller than 255 characters. It is in implementations'
   interests to keep these values as small as possible in any case, so
   this limitation is not expected to have any significant impact.


/a


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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 Extensions of the IETF.

        Title           : RTP Stream Identifier Source Description (SDES)
        Authors         : Adam Roach
                          Suhas Nandakumar
                          Peter Thatcher
	Filename        : draft-ietf-avtext-rid-06.txt
	Pages           : 9
	Date            : 2016-07-18

Abstract:
   This document defines and registers two new RTCP SDES items.  One,
   named RtpStreamId, is used for unique identification of RTP streams.
   The other, RepairedRtpStreamId, can be used to identify which stream
   a redundancy RTP stream is to be used to repair.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-avtext-rid/

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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 Extensions of the IETF.

        Title           : Frame Marking RTP Header Extension
        Authors         : Espen Berger
                          Suhas Nandakumar
                          Mo Zanaty
	Filename        : draft-ietf-avtext-framemarking-02.txt
	Pages           : 9
	Date            : 2016-07-18

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 encryption keys.  It is
   also useful for codec-agnostic processing of encrypted or unencrypted
   media, while it also supports extensions for codec-specific
   information.


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Subject: Re: [avtext] draft-ietf-avtext-rid-05: A couple of issues
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Den 2016-07-15 kl. 01:17, skrev Adam Roach:
> On 7/12/16 09:29, Magnus Westerlund wrote:
>> 1. The definition of the RepairedRtpStreamId in Section 3 is not
>> particular clear on the limitations this design have. As the SDES item
>> can only contain a single RtpStreamId value the implication is that
>> RepairedRtpStreamId can only be used when the redundancy mechanism has
>> a one to one relation with a source RTP stream. This can't be used
>> with redundancy mechanisms that protects multiple RTP streams. I think
>> this could be made clearer in Section 3.
>
> I'm not sure that's a limitation of the current design -- packet types
> are allowed to appear more than once, right? It seems that it would be
> reasonable to include more than one RepairedRtpStreamId SDES packet in a
> single compound packet, right? I agree that we need to say more about
> this, but the limitation you imply is necessary seems artificial.
>

I agree that this may not be really clear in RFC 3550, but use of 
multiple SDES items of the same type within a session is likely very 
error prone. Such usage would require an RTP extension, that is straight 
forward, but should not be attempted without prior agreement.

> I'm adding: "For those schemes in which a redundancy stream contains
> information used to repair more than one stream, multiple
> RepairedRtpStreamId SDES items may appear in a single compound packet.
> Due to the foregoing scoping rules, the RepairedRtpStreamId cannot be
> used to indicate streams in multiple sessions or with varying MIDs."
>

I am really worried about adding this to this document.

>
>> 2. Section 4.4:
>>
>> Extension URI: urn:ietf:params:rtp-hdrext:sdes:repair-rtp-sream-id
>>
>> Why is this URI not "Extension URI:
>> urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-sream-id"?
>
> Jetlag. I've fixed it.
>
>
>> 4. Section 3:
>>
>>    This specification defines two new RTCP SDES items [RFC3550]. The
>>    first item is 'RtpStreamId', which is used to carry RTP stream
>>    identifiers within RTCP SDES packets.  This makes it possible for a
>>    receiver to associate received RTP packets (identifying the RTP
>>    stream) with a media description having the format constraint
>>    specified.
>>
>> The definition of the RtpStreamId is missing a discussion of
>> requiremetns on the value.
>>
>> mmusic-rid document in Section 4 is indicating through the following
>> line:
>>
>>  A given
>>    "rid-id" MUST NOT be repeated in a given media description ("m="
>>    section).
>>
>> From my perspective I do wonder if the definition in this document
>> needs to makes this clear. And also possibly make it clear that there
>> exist no requirement for it be unique across all RTP streams in the
>> RTP session, something the name may imply. This clearly also indicates
>> that if one have multiple media sources that can use the same
>> RtpStreamIds then one needs some additional mechanism to identify
>> them. Media sources from different endpoints can be seperated using
>> SDES CNAME.
>
> Yes, a discussion of scoping is certainly called for. I propose:
>
>   RtpStreamId and RepairedRtpStreamId values are scoped by source
> identifier
>   (e.g., CNAME) and by media session. When the media is multiplexed
>   using the BUNDLE extension {{I-D.ietf-mmusic-sdp-bundle-negotiation}},
>   these values are further scoped by their associated MID values.
>   For example: an RtpStreamId of "1" may be present in the stream
>   identified with a CNAME of "1234@example.com", and may also be
>   present in a stream with a CNAME of "5678@example.org", and these
>   would refer to different streams. Similarly, an RtpStreamId of "1"
>   may be present with an MID of "A", and again with a MID of "B",
>   and also refer to two different streams.
>

Yes, I think this works. My one comment is to call "CNAME" for source 
identifier. With MID it is clearly the media source, but otherwise CNAME 
= Canonical End-Point Identifier, so it identifies the endpoint only. 
When I read it as currently formulated, it reads like Source IDentity = 
CNAME. That I find problematic.


>> 5. Section 3.
>>
>> I think adding a sentence that SDES items are UTF-8 and have a maximum
>> length of 255 Octets, and with a warning that as many symbols encoded
>> in UTF-8 have multi-octet representations, the limit to the number of
>> symbols that fits may be much lower than 255.
>
> I would think that "make them as small as possible" and "use this
> approach that keeps them one character long" should be sufficient, but
> I'll add text just to be triple-sure.
>
>   As with all SDES items, RtpStreamId and RepairedRtpStreamId are limited
>   to a total of 255 octets in length. Since the values of these items
>   are encoded with UTF-8, the use of multi-octet characters will result
>   in limitations smaller than 255 characters. It is in implementations'
>   interests to keep these values as small as possible in any case, so
>   this limitation is not expected to have any significant impact.
>

Yes, works for me.

Cheers


Magnus Westerlund

----------------------------------------------------------------------
Services, Media and Network features, Ericsson Research EAB/TXM
----------------------------------------------------------------------
Ericsson AB                 | Phone  +46 10 7148287
Färögatan 6                 | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com
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From: Randell Jesup <randell-ietf@jesup.org>
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Subject: Re: [avtext] [rmcat] Colin's feedback bandwidth analysis
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Adding avtext:

On 7/19/2016 8:51 AM, Randell Jesup wrote:
> Colin - thanks for the analysis!
>
> Agree with Mo that this implies we're way over the default 5% (which 
> can be bumped, of course, but knowing how far we need to bump it is 
> important).
>
> As for expected rates... I would expect a common range of rates 
> (especially at the start of a stream) would be 200-500kbps @ 30fps, 
> extending up to 1-3Mbps @ 30fps.  I would expect to see bandwidths 
> scale down to  40-50Kbps @ 30fps (I've deployed videophones operating 
> well down to that (QCIF H264)).  At the high end, I expect to scale up 
> to 5+Mbps @ 30 or even 60fps.  And there may be use for 60fps down in 
> the 500Kbps-2Mbps range for some usecases.
>
> This speaks to:
> * improve compression of the feedback data (RLE the loss data (or 
> huffman encode, etc), and delta-encode the arrival times).  I was 
> pretty sure we'd need to do this, and this confirms it.
> ** There's more to win with compressing the arrival times aggressively
> * negotiate the needed resolution and reporting intervals with the 
> sender-side control in some manner.  If need be, do it in-band in RTCP.
> ** while more painful in implementation, even the resolution/range of 
> the timestamps could be negotiated
> * we should consider if there's a way to compress or omit the repeated 
> information that's in every report that Colin enumerated
> ** list of streams etc rarely changes


I'll add:
* at lower bandwidths relax the reporting interval to reduce effects of 
overhead and improve compression of the data, at the cost of 
less-reactive results in the congestion control
** Implies the need to test the algorithms for sensitivity to 
less-than-ideal feedback intervals
* look at (with some annoying complexity implied) piggybacking this data 
on RTP packets in header extensions
** shares overhead with reverse-direction RTP (good), may add to delay 
in receiving them (bad), but given that packets may be queued in both 
directions, piggybacking may work well in practice at higher 
framerates.  If we need to send feedback and the next anticipated packet 
going out isn't for a "while", we'd send an RTCP.  If we're pacing 
packets out or likely to send one "soon" relative to the reporting 
frequency, piggyback it.
** size of the extension might be an issue (packet size limits)
** this definitely adds complexity, but can save a considerable amount 
of overhead

>
> The bandwidth implications of this was part of why (for adaptation in 
> the 30-250Kbps @ 30fps) I used sparse receiver-side congestion control 
> in the Ojo, reporting only significant changes in derived bandwidth 
> via RTCP.  The challenge here will be to find a way to fit feedback 
> needed for sender-side congestion control into the available 
> bandwidth.  I'm not concerned with having to increase the 5% default 
> per se, but I am concerned with how much "goodput" we get in two-way 
> traffic.  I don't want 200Kbps @ 30 spending 50Kbps on feedback....

-- 
Randell Jesup -- rjesup a t mozilla d o t com
Please please please don't email randell-ietf@jesup.org!  Way too much spam


--------------774AE1A03009E75CEBC3D435
Content-Type: text/html; charset=utf-8
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<html>
  <head>
    <meta content=3D"text/html; charset=3Dutf-8" http-equiv=3D"Content-Ty=
pe">
  </head>
  <body bgcolor=3D"#FFFFFF" text=3D"#000000">
    <div class=3D"moz-cite-prefix">Adding avtext:<br>
      <br>
      On 7/19/2016 8:51 AM, Randell Jesup wrote:<br>
    </div>
    <blockquote
      cite=3D"mid:c638ba76-63dd-6265-b532-d14690b65f29@jesup.org"
      type=3D"cite">
      <meta content=3D"text/html; charset=3Dutf-8" http-equiv=3D"Content-=
Type">
      Colin - thanks for the analysis!<br>
      <br>
      Agree with Mo that this implies we're way over the default 5%
      (which can be bumped, of course, but knowing how far we need to
      bump it is important).<br>
      <br>
      As for expected rates... I would expect a common range of rates
      (especially at the start of a stream) would be 200-500kbps @
      30fps, extending up to 1-3Mbps @ 30fps.=C2=A0 I would expect to see
      bandwidths scale down to=C2=A0 40-50Kbps @ 30fps (I've deployed
      videophones operating well down to that (QCIF H264)).=C2=A0 At the =
high
      end, I expect to scale up to 5+Mbps @ 30 or even 60fps.=C2=A0 And t=
here
      may be use for 60fps down in the 500Kbps-2Mbps range for some
      usecases.<br>
      <br>
      This speaks to:<br>
      * improve compression of the feedback data (RLE the loss data (or
      huffman encode, etc), and delta-encode the arrival times).=C2=A0 I =
was
      pretty sure we'd need to do this, and this confirms it.<br>
      ** There's more to win with compressing the arrival times
      aggressively<br>
      * negotiate the needed resolution and reporting intervals with the
      sender-side control in some manner.=C2=A0 If need be, do it in-band=
 in
      RTCP.<br>
      ** while more painful in implementation, even the resolution/range
      of the timestamps could be negotiated<br>
      * we should consider if there's a way to compress or omit the
      repeated information that's in every report that Colin enumerated<b=
r>
      ** list of streams etc rarely changes<br>
    </blockquote>
    <br>
    <br>
    I'll add: <br>
    * at lower bandwidths relax the reporting interval to reduce effects
    of overhead and improve compression of the data, at the cost of
    less-reactive results in the congestion control<br>
    ** Implies the need to test the algorithms for sensitivity to
    less-than-ideal feedback intervals<br>
    * look at (with some annoying complexity implied) piggybacking this
    data on RTP packets in header extensions<br>
    ** shares overhead with reverse-direction RTP (good), may add to
    delay in receiving them (bad), but given that packets may be queued
    in both directions, piggybacking may work well in practice at higher
    framerates.=C2=A0 If we need to send feedback and the next anticipate=
d
    packet going out isn't for a "while", we'd send an RTCP.=C2=A0 If we'=
re
    pacing packets out or likely to send one "soon" relative to the
    reporting frequency, piggyback it.<br>
    ** size of the extension might be an issue (packet size limits)<br>
    ** this definitely adds complexity, but can save a considerable
    amount of overhead<br>
    <br>
    <blockquote
      cite=3D"mid:c638ba76-63dd-6265-b532-d14690b65f29@jesup.org"
      type=3D"cite"> <br>
      The bandwidth implications of this was part of why (for adaptation
      in the 30-250Kbps @ 30fps) I used sparse receiver-side congestion
      control in the Ojo, reporting only significant changes in derived
      bandwidth via RTCP.=C2=A0 The challenge here will be to find a way =
to
      fit feedback needed for sender-side congestion control into the
      available bandwidth.=C2=A0 I'm not concerned with having to increas=
e
      the 5% default per se, but I am concerned with how much "goodput"
      we get in two-way traffic.=C2=A0 I don't want 200Kbps @ 30 spending
      50Kbps on feedback....</blockquote>
    <br>
    <pre class=3D"moz-signature" cols=3D"72">--=20
Randell Jesup -- rjesup a t mozilla d o t com
Please please please don't email <a class=3D"moz-txt-link-abbreviated" hr=
ef=3D"mailto:randell-ietf@jesup.org">randell-ietf@jesup.org</a>!  Way too=
 much spam
</pre>
  </body>
</html>

--------------774AE1A03009E75CEBC3D435--


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During today's MMUSIC face-to-face session, we had a brief discussion 
about the fact that RtpStreamId values are restricted to be 
alphanumeric. It was observed that the avtext RID document specifies the 
character set to be any valid UTF8.

The conclusion reached in the room was that these character sets should 
match each other, and that the more restricted set (alphanumeric) was 
appropriate. This has impact on the RID draft: specifically, this means 
we will restrict RtpStreamId and RepairedRtpStreamId will be constrained 
to be alphanumeric.

If anyone objects to this change, please speak up soon.

/a


From nobody Sun Jul 24 07:17:37 2016
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From: "Huangyihong (Rachel)" <rachel.huang@huawei.com>
To: "avtext@ietf.org" <avtext@ietf.org>
Thread-Topic: [avtext] WGLC: draft-ietf-avtext-avpf-ccm-layered-01
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Dear all,

As we agreed in the meeting, draft-ietf-avtext-avpf-ccm-layered-01 is ready=
 for WGLC now.


Today will begin a two-week WGLC on https://tools.ietf.org/html/draft-ietf-=
avtext-avpf-ccm-layered-01. Please have a careful review and raise any issu=
es you find, and state your support (or lack thereof) on list. This is impo=
rtant to ensure that the document we move on to the IESG has been double-ch=
ecked in detail.



The WGLC will end on Sunday, August 7, 2016.



BR,

Rachel


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<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">As we agreed in the meeting, dr=
aft-ietf-avtext-avpf-ccm-layered-01 is ready for WGLC now.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Today will begin a two-week =
WGLC on https://tools.ietf.org/html/draft-ietf-avtext-avpf-ccm-layered-01. =
Please have a careful review and raise any issues you find, and state your =
support (or lack thereof) on list. This
 is important to ensure that the document we move on to the IESG has been d=
ouble-checked in detail.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">The WGLC will end on Sunday,=
 August 7, 2016.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">BR,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Rachel<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
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From nobody Mon Jul 25 14:43:27 2016
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Subject: [avtext] Alia Atlas' No Objection on draft-ietf-avtext-splicing-notification-08: (with COMMENT)
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Alia Atlas has entered the following ballot position for
draft-ietf-avtext-splicing-notification-08: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-avtext-splicing-notification/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you very much for addressing my discuss.
I particularly found Sec 2.1 helped to clarify the architecture.



From nobody Tue Jul 26 15:18:25 2016
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Hi,

This is my AD evaluation of draft-ietf-avtext-rid-06. IIUC, the 
discussion about Magnus's comments is almost but not quite complete. I 
will hold IETF last call until the shepherd informs me that has been 
resolved, or that the resolution is unlikely to involve material 
changes. Otherwise, my comments are pretty minor and can be handled in 
parallel to the IETF last call.

Thanks!

Ben.

-------------------

Minor Comments:

- 4.3, last paragraph (and similar text in other registrations)

The first sentence is only guaranteed true if the implementation follows 
the guidance in 3.3. That says “strongly encouraged”. Maybe it 
should say something stronger?  (Or mention the condition here?)

- 6: Did you actually mean to acknowledge a co-author? (Peter)


Editorial Comments and Nits:

- Please expand first mention of "SDES" in both the abstract and body.

- 5, 2nd paragraph:
s/ impelementors / implementors ; unless you meant "impalementors". :-)

Also, does _this_ document strongly encourage encryption, or is that 
general encouragement from elsewhere that can be cited?

-5, 3rd paragraph:
s/exchange/change




From nobody Fri Jul 29 13:15:15 2016
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To: draft-ietf-avtext-rid.all@ietf.org, avtext@ietf.org
Date: Fri, 29 Jul 2016 15:15:11 -0500
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(This will be a repeat message for several, but I just realized I had 
not copied the working group.)

Based on discussion with Adam, I'm am going to go ahead and request IETF 
last call for this. I think the open issues are easily enough solved 
that they can be handled in parallel with the last call.

Ben.


On 26 Jul 2016, at 17:18, Ben Campbell wrote:

> Hi,
>
> This is my AD evaluation of draft-ietf-avtext-rid-06. IIUC, the 
> discussion about Magnus's comments is almost but not quite complete. I 
> will hold IETF last call until the shepherd informs me that has been 
> resolved, or that the resolution is unlikely to involve material 
> changes. Otherwise, my comments are pretty minor and can be handled in 
> parallel to the IETF last call.
>
> Thanks!
>
> Ben.
>
> -------------------
>
> Minor Comments:
>
> - 4.3, last paragraph (and similar text in other registrations)
>
> The first sentence is only guaranteed true if the implementation 
> follows the guidance in 3.3. That says “strongly encouraged”. 
> Maybe it should say something stronger?  (Or mention the condition 
> here?)
>
> - 6: Did you actually mean to acknowledge a co-author? (Peter)
>
>
> Editorial Comments and Nits:
>
> - Please expand first mention of "SDES" in both the abstract and body.
>
> - 5, 2nd paragraph:
> s/ impelementors / implementors ; unless you meant "impalementors". 
> :-)
>
> Also, does _this_ document strongly encourage encryption, or is that 
> general encouragement from elsewhere that can be cited?
>
> -5, 3rd paragraph:
> s/exchange/change
>
>
>
> _______________________________________________
> avtext mailing list
> avtext@ietf.org
> https://www.ietf.org/mailman/listinfo/avtext


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Subject: [avtext] Last Call: <draft-ietf-avtext-rid-06.txt> (RTP Stream Identifier Source Description (SDES)) to Proposed Standard
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The IESG has received a request from the Audio/Video Transport Extensions
WG (avtext) to consider the following document:
- 'RTP Stream Identifier Source Description (SDES)'
  <draft-ietf-avtext-rid-06.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2016-08-12. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

This document contains a normative reference to RFC 7656,
which is an informational RFC.

Abstract


   This document defines and registers two new RTCP SDES items.  One,
   named RtpStreamId, is used for unique identification of RTP streams.
   The other, RepairedRtpStreamId, can be used to identify which stream
   a redundancy RTP stream is to be used to repair.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-avtext-rid/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-avtext-rid/ballot/


No IPR declarations have been submitted directly on this I-D.


The document contains these normative downward references.
See RFC 3967 for additional information: 
    rfc7656: A Taxonomy of Semantics and Mechanisms for Real-Time Transport Protocol (RTP) Sources (Informational - IETF stream)
Note that some of these references may already be listed in the acceptable Downref Registry.



From nobody Fri Jul 29 14:19:38 2016
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To: Magnus Westerlund <magnus.westerlund@ericsson.com>, "avtext@ietf.org" <avtext@ietf.org>, "draft-ietf-avtext-rid@ietf.org" <draft-ietf-avtext-rid@ietf.org>
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Subject: Re: [avtext] draft-ietf-avtext-rid-05: A couple of issues
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On 7/19/16 08:33, Magnus Westerlund wrote:
>> I'm adding: "For those schemes in which a redundancy stream contains
>> information used to repair more than one stream, multiple
>> RepairedRtpStreamId SDES items may appear in a single compound packet.
>> Due to the foregoing scoping rules, the RepairedRtpStreamId cannot be
>> used to indicate streams in multiple sessions or with varying MIDs."
>>
>
> I am really worried about adding this to this document. 

Okay, so let's not support it and simply document that restriction.

"Note that the RepairedRtpStreamId mechanism is limited to indicating 
one repaired stream per redundancy stream. If systems require 
correlation for schemes in which a redundancy stream contains 
information used to repair more than one stream, they will have to use a 
more complex mechanism than the one defined in this specification."


/a


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<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
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  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-cite-prefix">On 7/19/16 08:33, Magnus Westerlund
      wrote:<br>
    </div>
    <blockquote
      cite="mid:9a82f380-edec-1d87-5afc-2d2b6f061f5d@ericsson.com"
      type="cite">
      <blockquote type="cite" style="color: #000000;">I'm adding: "For
        those schemes in which a redundancy stream contains
        <br>
        information used to repair more than one stream, multiple
        <br>
        RepairedRtpStreamId SDES items may appear in a single compound
        packet.
        <br>
        Due to the foregoing scoping rules, the RepairedRtpStreamId
        cannot be
        <br>
        used to indicate streams in multiple sessions or with varying
        MIDs."
        <br>
        <br>
      </blockquote>
      <br>
      I am really worried about adding this to this document.
    </blockquote>
    <p>Okay, so let's not support it and simply document that
      restriction.</p>
    <p>"Note that the RepairedRtpStreamId mechanism is limited to
      indicating one repaired stream per redundancy stream. If systems
      require correlation for schemes in which a redundancy stream
      contains information used to repair more than one stream, they
      will have to use a more complex mechanism than the one defined in
      this specification."</p>
    <p><br>
    </p>
    <p>/a<br>
    </p>
  </body>
</html>

--------------5F6D4A6AF2AEDF6AA17FD825--


From nobody Fri Jul 29 23:10:33 2016
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From: "Huangyihong (Rachel)" <rachel.huang@huawei.com>
To: "avtext@ietf.org" <avtext@ietf.org>
Thread-Topic: [avtext] IETF 96 AVTEXT WG session minutes
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Subject: [avtext]  IETF 96 AVTEXT WG session minutes
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Hi,

The initial version of the minutes for the AVTEXT WG meeting in Berlin (IET=
F 96) is available now https://www.ietf.org/proceedings/96/minutes/minutes-=
96-avtext. Thanks to Peter and Marc in taking the notes. If there are any c=
orrections or discrepancy, please let me know.

BR,
Rachel


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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The initial version of the minu=
tes for the AVTEXT WG meeting in Berlin (IETF 96) is available now
<a href=3D"https://www.ietf.org/proceedings/96/minutes/minutes-96-avtext">h=
ttps://www.ietf.org/proceedings/96/minutes/minutes-96-avtext</a>. Thanks to=
 Peter and Marc in taking the notes. If there are any corrections or discre=
pancy, please let me know.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">BR,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rachel<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
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