International organisation for standardisation organisation internationale de normalisation

1IDCT in MPEG Standards

The ANSI/IEEE 1180 standard (DCT/IDCT implementation accuracy) was withdrawn in 2003. As decided in the 70^th meeting, a new part ISO/IEC 11172 6: Specification for Implementation of Inverse Discrete Cosine Transform had been drafted, and was at FCD stage at the time of the Busan meeting. During the editing period of the FCD, further study was performed within the AHG. As references towards IEEE 1180 were different within the MPEG standards (11172-2, 13918-2, 14496-2), it will be necessary to put more effort into individual corrigenda of the three standards than originally expected. By this work, existing conformance criteria shall not be affected. Draft corrigenda could be issued in July.

2MPEG-4

2.1New Levels in Visual Simple Profile

The final draft amendment on new levels in Visual Simple Profile (related to VGA size progressive display applications) was produced. Disposition of NB comments was made adequately. The related conformance FDAM was finalized as well.

Documents reviewed:

11831	SC 29 Secretariat	Summary of Voting on ISO/IEC 14496-2:2004/FPDAM 2 [SC 29 N 6555]
11832	SC 29 Secretariat	Summary of Voting on ISO/IEC 14496-4:2004/FPDAM 10 [SC 29 N 6556]

Output documents

No.	Title	TBP	Available
	14496-2 MPEG-4 Visual
7079	Disposition of Comments on ISO/IEC 14496-2:2004 FPDAM2	No	05/04/22
7080	Text of ISO/IEC 14496-2:2004 FDAM2 New Levels in Simple Profile	No	05/04/22
	14496-4 MPEG-4 Conformance
7116	Disposition of Comments on ISO/IEC 14496-4:2004 FPDAM10	No	05/04/22
7117	Text of ISO/IEC 14496-2:2004 FDAM10 New Levels in Simple Profile Conformance	No	05/04/22

2.2Visual Conformance Corrigenda

The two corrigenda on Visual bitstreams conformance were finalized. NB comments were disposed of properly, mainly by considering the Study of DCOR texts from the 71^st meeting (N6891 and N6892). As one NB also requested to consider the report on erroneous bitstreams (N6893), it would further be possible to exclude any bitstream from being removed during the remaining editing period of 4 weeks. Still a total of more than 40 streams are missing or incorrect. A follow-up action in 14496-2, removing profiles which would have lost conformance, could be started by July. This situation was again reflected by a resolution.

Documents reviewed:

11831	SC 29 Secretariat	Summary of Voting on ISO/IEC 14496-2:2004/FPDAM 2 [SC 29 N 6555]
11832	SC 29 Secretariat	Summary of Voting on ISO/IEC 14496-4:2004/FPDAM 10 [SC 29 N 6556]

Output documents:

No.	Title	TBP	Available
	14496-4 MPEG-4 Conformance
7118	Disposition of Comments on ISO/IEC 14496-4:2004 DCOR1	No	05/04/22
7119	Text of ISO/IEC 14496-4:2004 COR1 Visual Bitstreams Conformance Corrigendum	No	05/05/20
7120	Disposition of Comments on ISO/IEC 14496-4:2004/Amd.1 DCOR1	No	05/04/22
7121	Text of ISO/IEC 14496-4:2004/Amd.1 COR1 Visual Bitstreams Conformance Corrigendum	No	05/05/20

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