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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

  • 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

  • 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

  • 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.

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