Organisation internationale de normalisation

Discussion

After some discussion in closing Audio plenary, it was determined that if both ALS and SLS profiles issue as WD at this meeting, they will progress to FDAM at the 89^th meeting and the progressing to PDAM at this meeting does not advance the FDAM date. It is the understanding of the Audio Subgroup experts that additional information on the performance of CBAC will be available at the 86^th meeting and the issue of whether or not this tool is included in the proposed SLS profile will be resolved at that meeting.

Corrigendum

Ralf Geiger, FhG, presented

m15629

Proposed Corrigendum on MPEG-4 SLS

Ralf Geiger Ralph Sperschneider Virgilio Bacigalupo

This document requests technical changes:

• 
  Change coding of lle_ics_length in the text to conform to coding of lle_ics_length as in the reference software.
  
• 
  Change the function of read_bits() in the reference software so that it conforms to what is stated in the text and change one conformance stream and decoded waveform.
  

Eunmi Oh, Samsung, noted that the proposed fix for read_bits() may not be actually correct. Samsung experts will review and get back to the group. The Chair suggested that, after further break-out work, the proposed DCOR text be brought forward for further review.

Andreas Schneider, Dolby, presented

m15638

proposed correction to MPEG-2 SBR conformance

Andreas Schneider

This contribution pointed that certain conformance data for MPEG-4 AAC (in which SBR is used) were corrected, but that the corresponding conformance data in MPEG-2 AAC were never corrected.

It was the consensus of the Audio Subgroup to issue at this meeting a DCOR to MPEG-2 Conformance.

Andreas Schneider, Dolby, presented

Tm15640

proposed correction of the MPEG-4 HE AAC v2 profile

Andreas Schneider

his contribution pointed out that mono and stereo mixdown elements are excluded from AAC and HE-AAC profiles but not HE-AAC V2 profile. It is proposed that this restriction be added to the V2 profile. It was the consensus of the Audio Subgroup to issue at this meeting a DCOR to MPEG-4 Audio.

Andreas Schneider, Dolby, presented

m15639

proposed clarification for MPEG-2 and MPEG-4 AAC

Andreas Schneider Karsten Linzmeier

The contribution proposes to align the MPEG-2 and MPEG-4 text with the reference software. It was the consensus of the Audio Subgroup to issue at this meeting a DCOR to MPEG-2 Audio and to add the correction for this issue to the DCOR to MPEG-4 Audio associated with the previous contribution.