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Tue, 29 Oct 2019 14:13:40 +0000 From: Magnus Westerlund To: "james.sandford@bbc.co.uk" , "iesg@ietf.org" CC: "avtcore-chairs@ietf.org" , "draft-ietf-payload-rtp-ttml@ietf.org" , "avt@ietf.org" Thread-Topic: [AVTCORE] Magnus Westerlund's Discuss on draft-ietf-payload-rtp-ttml-03: (with DISCUSS and COMMENT) Thread-Index: AQHViBg098PKMu0mGUinEkYSbhMDKKdmeGCAgASwwwCABmACcIAAJsKAgAAGBgA= Date: Tue, 29 Oct 2019 14:13:40 +0000 Message-ID: <85eb369a2eb610f6c881595fab9ff249fb68ddcc.camel@ericsson.com> References: <157166654391.31879.7510825796211658153.idtracker@ietfa.amsl.com> , <5b2c2983f307529dbca5feebfb75c120a4ab5ef5.camel@ericsson.com> <734752AF0E88364D983373FE5CEFED5771C9787B@bgb01xud1001> , <734752AF0E88364D983373FE5CEFED5771C9BBEA@bgb01xud1001> In-Reply-To: <734752AF0E88364D983373FE5CEFED5771C9BBEA@bgb01xud1001> 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=magnus.westerlund@ericsson.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi James, Looks good to me.=20 Thanks, Magnus On Tue, 2019-10-29 at 13:52 +0000, James Sandford wrote: > Thank you for your further comments. >=20 > I will make the suggested changes to Section 8 and Section 11.1. >=20 > With regards to further clarifying the fragmentation of documents, I prop= ose > the following: >=20 > Section 6 OLD: > If a TTML document is assessed to be invalid then it MUST be discarded.= When > processing a valid document, the following requirements apply. >=20 > Section 6 NEW: > If a TTML document is assessed to be invalid then it MUST be discarded.= This > includes empty documents, i.e. those of zero length. When processing a va= lid > document, the following requirements apply. >=20 > Section 8 ADDITIONAL PARAGRAPH: > As described in Section 6, only zero or one TTML document may be active= at > any point in time. As such, there MUST only be one document transmitted = for a > given RTP Timestamp. Furthermore, as stated in Section 4.1, the Marker B= it > MUST be set for a packet containing the last fragment of a document. A p= acket > following one where the Marker Bit is set contains the first fragment of = a new > document. The first fragment might also be the last. >=20 >=20 > Regards, > James >=20 >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > James Sandford > R&D Project Engineer >=20 > BBC Research and Development > 5th Floor > Dock House > MediaCityUK > Salford > M50 2LH >=20 > Tel: 030304 (09549) > Web: http://www.bbc.co.uk/rd >=20 > ________________________________________ > From: Magnus Westerlund [magnus.westerlund@ericsson.com] > Sent: 29 October 2019 11:47 > To: James Sandford; iesg@ietf.org > Cc: avtcore-chairs@ietf.org; draft-ietf-payload-rtp-ttml@ietf.org;=20 > avt@ietf.org > Subject: RE: [AVTCORE] Magnus Westerlund's Discuss on draft-ietf-payload-= rtp- > ttml-03: (with DISCUSS and COMMENT) >=20 > Hi James, >=20 > Thanks for the many updates in -04. However, I think there are a couple = of > adjustments still needed. >=20 > Section 8: >=20 > When a document spans more than one RTP packet, the entire document > is obtained by concatenating User Data Words from each contributing > packet in ascending order of Sequence Number. >=20 > I think this can be further clarified by adding "consecutive" >=20 > When a document spans more than one RTP packet, the entire document > is obtained by concatenating User Data Words from each consecutive > contributing > packet in ascending order of Sequence Number. >=20 > What I think is unclear is what is considered contributing packets. It is > quite common that one determine fragments based on timestamp and that may= be > assumed by some. I don't know if that is a dangerous assumption here. To = my > understanding one can determine the set of fragments by looking at the > marker bit for the packets. From first 0 after a 1, until and including t= he > packet with a m=3D1. If that is your intention for how one should do it, = so > that it works for multiple documents to share epoch and thus RTP timestam= p > documents I think this needs to be made explicit. >=20 > In section 11.1 it says: >=20 > In these situations, it is RECOMMENDED that streams use > the same Synchronization Source and Clock Rate as the related media. >=20 > You do need to insert "Time" before Synchronization source to not be > misinterpret to mean SSRC. Or maybe better is to say "clock source". >=20 > Cheers >=20 > Magnus Westerlund --=20 Cheers Magnus Westerlund=20 ---------------------------------------------------------------------- Networks, Ericsson Research ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Torshamnsgatan 23 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- --=-+KFfTwEdQeFN4/r7LW1l Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEtww ggYHMIID76ADAgECAhALRm3NcHtuMGWutmt5cXntMA0GCSqGSIb3DQEBCwUAMEcxCzAJBgNVBAYT AlNFMREwDwYDVQQKDAhFcmljc3NvbjElMCMGA1UEAwwcRXJpY3Nzb24gTkwgSW5kaXZpZHVhbCBD QSB2MzAeFw0xNzEyMTUwNzIyMjNaFw0yMDEyMTUwNzIyMjJaMHAxETAPBgNVBAoMCEVyaWNzc29u 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