-----Original Message----- From: Romascanu, Dan (Dan) [mailto:[email protected]] Sent: maandag 10 juni 2013 16:57 To: Brandenburg, R. (Ray) van Cc: [email protected]; General Area Review Team; Roni Even ([email protected]); [email protected] Subject: RE: Gen-ART review of draft-ietf-avtcore-idms-09
> -----Original Message----- > From: Brandenburg, R. (Ray) van [mailto:[email protected]] > Sent: Monday, June 10, 2013 5:52 PM > To: Romascanu, Dan (Dan) > Cc: [email protected]; General Area Review Team; Roni Even > ([email protected]); [email protected] > Subject: RE: Gen-ART review of draft-ietf-avtcore-idms-09 > > Hi Dan, > > See below... > > Best regards, > > Ray > > -----Original Message----- > From: Romascanu, Dan (Dan) [mailto:[email protected]] > Sent: maandag 10 juni 2013 16:35 > To: Brandenburg, R. (Ray) van > Cc: [email protected]; General Area Review Team; Roni Even > ([email protected]); [email protected] > Subject: RE: Gen-ART review of draft-ietf-avtcore-idms-09 > > > Yes, we seem to get closer and closer, focus on one last issue (and > much agreement deleted) > > Thanks and Regards, > > Dan > > > > > -----Original Message----- > > From: Brandenburg, R. (Ray) van [mailto:[email protected]] > > Sent: Monday, June 10, 2013 5:27 PM > > To: Romascanu, Dan (Dan) > > Cc: [email protected]; General Area Review Team; Roni Even > > ([email protected]); [email protected] > > Subject: RE: Gen-ART review of draft-ietf-avtcore-idms-09 > > > > Hi Dan, > > > > Please see inline. We seem to be converging:) > > > > Ray > > > > > 7. In Section 8: > > > > > > > > The timestamp is formatted based on the NTP > > > > timestamp format as specified in [RFC5905]. If this field is > > > empty, > > > > then it SHALL be set to 0. This field MAY be left empty if > > > > none > > or > > > > only one of the receivers reported on presentation timestamps. > > > > > > > > Why a MAY here? Especially for the case when none of the > > > > receivers reported, what content can be set there but 0 ? > > > > > > > > [Ray: I believe it should be up to the implementation to decide > > > > how it wants to handle the case of there being only one receiver > > > > who reported on presentation timestamps]. > > > > > > > [[DR]] OK, so the cases when none of the receivers reported and > > > one receiver only reported should be dealt with differently. This > > > needs to be clarified. > > > > > > [Ray] What exactly is the problem with the MAY here? IMO it > > > doesn't create any interop issues: whatever is the reason for > > > setting the value to 0, to the client the end result is the same: ignore > > > it. > > > > > > > [[DR]] In the case when none of the receivers reported we want to > > avoid leaving some garbage in this field which could be interpreted > > differently - don't we? > > > > [Ray] I think I see where we disagree. The paragraph says: "If this > > field is empty, then it SHALL be set to 0. This field MAY be left > > empty if none or only one of the receivers reported on presentation > > timestamps". The way I read this is as: In the case the field is > > declared empty (= contains NULL information), it SHALL be set to 0. > > There can be different reasons for declaring the field empty/NULL, > > one of those reasons is if none or only one receiver reported on > > presentation timestamps. To me, the paragraph doesn't say that this > > is the only possible reason, but it does specify very clearly that > > if you decide the field should be empty, you SHALL set it to zero. > > > > > > [[DR]] But then, why do not you take out 'if none or' - because for > the option of 'none' there is no alternative but the 'null' > information, and the MAY does not make sense. > > [Ray] The fact that no receiver reported on the packet presentation > timestamp does not necessarily mean that the MSAS does not want to > indicate a proposed packet presentation timestamp. The absence of such > reports just means that the proposed playout moment might not be > realistic, or be supported by any receiver. > [[DR]] yes, but is the field set to anything but 0 in such cases? [Ray] If the MSAS decides to leave the field empty, it is set to 0 according to the SHALL. If the MSAS decides to include a timestamp anyway, it is set to whatever value the MSAS proposes. Dan This e-mail and its contents are subject to the DISCLAIMER at http://www.tno.nl/emaildisclaimer _______________________________________________ Gen-art mailing list [email protected] https://www.ietf.org/mailman/listinfo/gen-art
