[AVTCORE] [Editorial Errata Reported] RFC7273 (4450)
RFC Errata System <rfc-editor@rfc-editor.org> Tue, 18 August 2015 14:49 UTC
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Subject: [AVTCORE] [Editorial Errata Reported] RFC7273 (4450)
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The following errata report has been submitted for RFC7273, "RTP Clock Source Signalling". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata_search.php?rfc=7273&eid=4450 -------------------------------------- Type: Editorial Reported by: Kevin Gross <kevin.gross@avanw.com> Section: 5.5 Original Text ------------- 5.5. Examples v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 239.0.0.2/255 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/8 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:0 a=mediaclk:offset=963214424 Figure 6: Media clock directly referenced to IEEE 1588-2008 v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 239.0.0.2/255 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/44100/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:0 a=mediaclk:offset=963214424 rate=1000/1001 Figure 7: "Oddball" sample rate directly refernced to IEEE 1588-2008 v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 224.2.228.230/32 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:0 a=mediaclk:rtp=IN IP4 239.0.0.1 5004 00:60:2b:20:12:if Figure 8: Stream media clock derived from another RTP multicast stream v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 224.2.228.230/32 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:0 a=mediaclk:IEEE1722=38-D6-6D-8E-D2-78-13-2F Figure 9: Stream media clock derived from another RTP multicast stream Corrected Text -------------- 5.5. Examples v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 239.0.0.2/255 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/8 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:domain-nmbr=0 a=mediaclk:offset=963214424 Figure 6: Media clock directly referenced to IEEE 1588-2008 Figure 7 shows an example SDP description 2 channels of 24-bit, 44056 kHz NTSC "pull-down" media clock derived directly from an IEEE 1588- 2008 reference clock v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 239.0.0.2/255 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/44100/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:domain-nmbr=0 a=mediaclk:offset=963214424 rate=1000/1001 Figure 7: "Oddball" sample rate directly refernced to IEEE 1588-2008 Figure 8 shows the same 48 kHz audio transmission from Figure 6 with media clock derived from another RTP multicast stream. The stream providing the media clock must use the same reference clock as this stream that references it. v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 224.2.228.230/32 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:domain-nmbr=0 a=mediaclk:rtp=IN IP4 239.0.0.1 5004 00:60:2b:20:12:if Figure 8: Stream media clock derived from another RTP multicast stream Figure 9 shows the same 48 kHz audio transmission from Figure 6 with media clock derived from an IEEE 1722 AVB stream. The stream providing the media clock must be synchronized with the IEEE 1588- 2008 reference clock used by this stream. v=0 o=- 1311738121 1311738121 IN IP4 192.168.1.1 c=IN IP4 224.2.228.230/32 s= t=0 0 m=audio 5004 RTP/AVP 96 a=rtpmap:96 L24/48000/2 a=sendonly a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:domain-nmbr=0 a=mediaclk:IEEE1722=38-D6-6D-8E-D2-78-13-2F Figure 9: Stream media clock derived from another RTP multicast stream Notes ----- There is an inconsistency between ABNF in section 4.8 and examples in section 5.5. It would be cleaner to correct the examples and that is what is proposed above. There is evidence, however, that current implementations are working to what is shown in the examples, not according to the ABNF specification. Instructions: ------------- This erratum is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party (IESG) can log in to change the status and edit the report, if necessary. -------------------------------------- RFC7273 (draft-ietf-avtcore-clksrc-11) -------------------------------------- Title : RTP Clock Source Signalling Publication Date : June 2014 Author(s) : A. Williams, K. Gross, R. van Brandenburg, H. Stokking Category : PROPOSED STANDARD Source : Audio/Video Transport Core Maintenance RAI Area : Real-time Applications and Infrastructure Stream : IETF Verifying Party : IESG
- [AVTCORE] [Editorial Errata Reported] RFC7273 (44… RFC Errata System
- [AVTCORE] [Errata Verified] RFC7273 (4450) RFC Errata System