Organisation internationale de normalisation

Joint meeting with Requirements at Audio (Thu 0900-0930)

2. Task Group discussions

   1. DRC

Frank Baumgarte, Apple, presented

m35128

Proposed study on ISO/IEC 23003-4:2014 / DIS, Dynamic Range Control

Frank Baumgarte, David Singer, Michael Kratschmer, Bernhard Neugebauer

DRC

The contribution is a Study on Text. The changes in the Study on are summarized in the following table:

Page	Reference	Description of change
4	Table 1	Added a new table (Table 1) to summarize the use of separate metadata and audio tracks in ISO Base Media File Format
6	Before Table 4	Added paragraph to clarify that the metadata track identifier is ‘unid’. This box is defined in the file format specification.
6	Table 4	Corrected typo
8	Before section 6.1.3	Added paragraph to reference the LoudnessBox of 14496-12 for clarity and completeness.
11	Before 6.3	Added sentence to describe the DRC gain sequence format for 14496-12
27	Figure 5	Fixed figure so that it is rendered correctly on all platforms (same content)
35	Table 24	Adjusted filterSlope value to match reference software
65	Table A.35	Clarify that there are two options for standards in loudness measurements. Having two options is in line with CICP and 14496-12
66	Table A.36	Added an a loudness measurement option to the table to be in line with CICP and 14496-12
87	E.2.2	Improved second paragraph of informative text.
98	[8]	Added reference for the loudness measurement
		Minor editorial changes

It was the consensus of the Audio subgroup to issue this contribution as an output document. The Chair noted that most or all of the proposals are editorial in nature, in that they clarify what the specification already says, or how it relates to a companion specification. National Bodies are encouraged to review the information in the contribution when casting their ballot on the DRC DIS.

Michael Kratschmer, Apple, presented

m35032

Software for MPEG-D DRC RM4

Michael Meier, Bernhard Neugebauer, Michael Kratschmer , Frank Baumgarte

DRC-SW

The contribtion reports on code changes to:

• 
  Remove obsolete modules
  
• 
  Add new “helper functions” to aid in integrating the DRC functionality with the MPEG-H 3D Audio reference software.
  
• 
  Simplify encoder API
  

The contribution will be an output document with the new source code as a zip archive in the document zip archive. The DRC Reference Software will remain at WD status. The presenter suggested that it might progress to PDAM at the next meeting.

2.