International organisation for standardisation organisation internationale de normalisation
Audio closing plenary discussions
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- 4.7WG11 closing plenary discussions
- 5Meeting deliverables 5.1Press statement
- 5.4Recommendations for final plenary
- 5.6Approval of output documents
- 6.2Agenda for next meeting
4.6Audio closing plenary discussionsSeveral discussions that took place in Friday’s Audio closing plenary are noted under the appropriate headings elsewhere in this report. However there was discussion on “profile-dependent behaviour” that has no other place in this report, and so will be noted here. The Audio Chair brought up this as a general topic, but which was motivated by the fact that currently one signalling mode for HE-AAC profile specifies that a AAC profile decoder should not play a HE-AAC profile bitstream. This appears to be contrary to the long-standing WG11 policy of only specifying what a decoder shall do, but what it shall not do. In other words, a conformant decoder can always do more than what the specification mandates. David Singer, Apple, indicated that his company strongly supports the WG11 policy and does not support the current HE-AAC profile restrictions. 4.7WG11 closing plenary discussionsIn the Audio Chair’s presentation during Friday’s MPEG closing plenary, three items prompted discussion from WG11 delegates and hence will be noted here. First, the Convenor reminded the Audio chair that WG11 cannot be a forum to promote a program that is or appears to be a “for-profit.” Hence the UoM UMusic database document will be edited such that it promotes only those aspects of the database that are available free of charge. Second, Audio Chair asked Stefan Kraegeloh, FhG, to present the Audio output document that was the result of the Joint with MDS, Req on Content Protection for MAF Music Player. This presentation resulted in considerable discussion amongst WG11 experts. Based on this discussion, the document approved by Audio was edited to incorporate various points of view such that all WG11 delegates were able to approve the resulting document. Third, the Audio presentation raised an issue that requested comment from WG11 experts, that being whether MPEG profiles can “prohibit” a specified behaviour in a conformant decoder. This did result in many valuable comments from the floor, and the consensus was that a WG11 specification should not preclude a conformant decoder from doing “more” than the specification requires. Hence the current Audio specifications for HE-AAC Profile and HE-AAC V2 Profile may need revision. For details on HE-AAC Profile, Audio experts are encouraged to review 5570 Text of ISO/IEC 14496-3:2001/FDAM 1, Bandwidth Extension , Clause 1.6.5 Signaling of SBR and Table 1.15A – SBR Signaling and Corresponding Decoder Behavior And for HE-AAC V2 Profile N7016 ISO/IEC 14496-3:2001/FPDAM 4, Audio Lossless Coding (ALS), new audio profiles and BSAC extensions and 7134 Study on 14496-3:2001/FPDAM 4. In either document, look at Clause 1.6.6 Signaling of Parametric Stereo (PS) and Table 1.15A – PS Signaling and Corresponding Decoder Behavior 5Meeting deliverables5.1Press statementThe Audio part of the press statement was prepared. 5.2Dispositions of CommentsThe DoC were prepared and approved. 5.3Responses to Liaison and NB commentsLiaison initiated by Audio were prepared and approved. The responses to the NB comments were prepared and approved. 5.4Recommendations for final plenaryThe Audio recommendations were presented and approved. 5.5Establishment of Ad-hoc GroupsThe following ad-hoc groups were established by the Audio subgroup:
5.6Approval of output documentsAll output documents, shown in Annex D, were presented in Audio plenary and were approved. 6Future activities6.1Schedule of future meetingsAd Hoc group meetings are indicated in Section 5.5. Unless otherwise indicated, Ad Hoc group meetings will be held at the location of the next MPEG meeting on the weekend preceding that meeting. 6.2Agenda for next meetingThe agenda for the next MPEG meeting is shown in Annex E 6.3All other businessThere was none. 6.4Closing of the meetingThe 72nd Audio Subgroup meeting was adjourned Friday at 13:54. The Chair thanked the Audio experts for their hard work during the week, and urged them to enjoy their 6-minute lunch break.
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