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Tue, 3 Dec 2019 12:03:30 +0000 From: Bo Burman To: Magnus Westerlund , "Barry Leiba (barryleiba@computer.org)" , Bernard Aboba CC: "draft-ietf-avtcore-multiplex-guidelines.all@ietf.org" , "avt@ietf.org" Thread-Topic: Moving draft-ietf-avtcore-multiplex-guidelines along Thread-Index: AQHVaV2MSS5GOpmtZUihAsvqVWdVvKeTueGAgABIroCAAABjAIAUnA6A Date: Tue, 3 Dec 2019 12:03:29 +0000 Message-ID: References: In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=bo.burman@ericsson.com; x-originating-ip: [192.176.1.84] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 5df10e25-afa3-4f2b-3833-08d777e8cfe6 x-ms-traffictypediagnostic: HE1PR07MB3484:|HE1PR07MB3484: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 02408926C4 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(39860400002)(376002)(366004)(396003)(346002)(136003)(199004)(189003)(13464003)(43544003)(86362001)(99286004)(5660300002)(76116006)(25786009)(14454004)(55016002)(110136005)(256004)(6436002)(66946007)(66476007)(478600001)(52536014)(316002)(66556008)(66616009)(64756008)(66446008)(53546011)(76176011)(6506007)(74316002)(81156014)(81166006)(186003)(26005)(305945005)(8936002)(71190400001)(71200400001)(11346002)(446003)(7736002)(102836004)(4326008)(229853002)(44832011)(8676002)(2906002)(6246003)(33656002)(7696005)(3846002)(54906003)(9686003)(6116002); 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charset="UTF-8" Content-Transfer-Encoding: 7bit Hi, I've started a (so far author-internal) draft -10 that tries to address most of Bernard's comments; in progress. I however didn't yet do a total re-haul to consider if use of MID/RID/RRID is sufficiently covered and described throughout the document. Help on identifying potentially impacted text would be greatly appreciated, from my co-authors as well as from the list. Regarding Bernard's comment to section 5.2: > 3. For applications with dynamic usage of RTP streams, i.e. > frequently added and removed, having much of the state associated > with the RTP session rather than per individual SSRC can avoid > the need for in-session signalling of meta-information about each > SSRC. > > [BA] Not sure I grasp your point here. If there are multiple SSRCs in the > same RTP session, avoiding the need for in-session signaling typically > requires: > > a. A mechanism for handling "unsignaled streams" (e.g. an Unhandled RTP > event as in ORTC), OR > > b. Support for MID to allow routing to the correct RTP receiver without > in-session signaling of the SSRC. Firstly, I think the original text in bullet 3 doesn't consider use of bundle or MID but rather assumes the pre-bundle type of RTP session. Adding use of MID would be part of an RTP session state (e.g. mapping SSRC to an media source, which would also map to an m= line if SDP is used) that doesn't require in-session signaling. That would correspond to your alternative b. Secondly, there could still be "unsignaled streams" handling, either within (using same) MID or when not using MID in the RTP session, where other RTP session information can be used to allow proper handling of dynamically occuring RTP streams, such as e.g. RTCP SDES CNAME to identify RTP streams sent from the same endpoint (but not necessarily the same media source). What type of RTP session information that is needed for proper RTP stream handling depends on, I must assume, application-dependent requirements. That would correspond to your alternative a. Bernard, you indicate "a OR b" above; should they be seen as mutually exclusive or could they both apply in the way I indicate? Would adding a clarification along the lines above address your concern? Cheers, /Bo > -----Original Message----- > From: Barry Leiba > Sent: den 20 november 2019 07:22 > To: Magnus Westerlund > Cc: draft-ietf-avtcore-multiplex-guidelines.all@ietf.org; avt@ietf.org > Subject: Re: Moving draft-ietf-avtcore-multiplex-guidelines along > > Thanks; I'd love to move it forward. > > b > > On Wed, Nov 20, 2019 at 2:20 PM Magnus Westerlund > wrote: > > > > Hi Barry, > > > > Sorry, this has failed to get the necessary author time to take care > > of the comments. Will try to get it done soonish. > > > > Cheers > > > > Magnus Westerlund > > > > ------=_NextPart_000_001D_01D5A9DA.0E3BEA70 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIVXjCCAyAw ggIIoAMCAQICAR0wDQYJKoZIhvcNAQEFBQAwOTELMAkGA1UEBhMCRkkxDzANBgNVBAoTBlNvbmVy YTEZMBcGA1UEAxMQU29uZXJhIENsYXNzMiBDQTAeFw0wMTA0MDYwNzI5NDBaFw0yMTA0MDYwNzI5 NDBaMDkxCzAJBgNVBAYTAkZJMQ8wDQYDVQQKEwZTb25lcmExGTAXBgNVBAMTEFNvbmVyYSBDbGFz czIgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCQF0o1ncrwDZbHRPoWN/xIvb1/ gC01O+FvqGepvwMcTYxvMkfVQWikEwTBNQyahEP8XB3/ibPoFxjNkV/7iePqv05dfBsm03V57eaE 41flrSnE9Doo56V7hDZps/1edr2jLZnTkE4jKH0YY/FUOyaddluXQrL/rvBO7N05lU6DBn/nSUDI xQGyVFpmHT38+ek8Cp6BuHDwAYvkI1R8yK74kB4AlnLUVM9hI7zq+50CldG2uXE6aQg/D7ThQseI 9T+YqKe6HOBxce9YV4FQelxrdEYOgwOYw46obvJ2Mm4ng8Jz89wY6LST6nVEawRgIHFXh53zvqCQ 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