International organisation for standardisation organisation internationale de normalisation

Maintenance

Frank Baumgarte, Apple, presented

m32274

Proposed extension of 14496-3 to support DRC

Frank Baumgarte, Nikolaus Rettelbach,

The contribution proposes a method to carry DRC metadata in MPEG-4 Audio. What is proposed is:

• 
  A Fill Element extension_type is defined
  
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  A field is defined to specify the DRC time resolution
  
• 
  Additional syntax in the Fill Element is defined to carry the DRC information
  

Open issues

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  How to make DRC mandatory for future implementations
  
• 
  How to carry the uni_drc() payload from e.g. the AAC decoder to the DRC decoder.
  

It was the consensus of the Audio subgroup to issue the contribution as part of Working Draft of MPEG-4 Audio Amendment 5.

Max Neuendorf, FhG-IIS, presented

m32397

Proposed Updates to MPEG-4 Audio

Stephan Schreiner, Nikolaus Rettelbach

The contribution proposed

• 
  Add profile/level indication for SAOC-DE
  
• 
  Equation for downmix to mono
  

It was the consensus of the Audio subgroup to issue the contribution as part Working Draft of MPEG-4 Audio Amendment 5.

Max Neuendorf, FhG-IIS, presented

m32314

Reference Software and Conformance for ISO/IEC 14496-3:2009 AMD 4

Nikolaus Rettelbach

The contribution proposes

• 
  Extensions to ISO/IEC 14496-26, MPEG Audio Conformance to support ISO/IEC 14496-3:2009 AMD 4 technology
  
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  Extensions to ISO/IEC 14496-5 to support ISO/IEC 14496-3:2009 AMD 4 technology
  

The Audio subgroup looks forward to WD text for amendments to ISO/IEC 14496-26 and ISO/IEC 14496-5 at a future MPEG meeting.

5.