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mp4ra / mp4ra.github.io

MPEG-4 Registration Authority Web Site
https://mp4ra.github.io/
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Question on `adda` and `adrc` #136

Closed podborski closed 2 years ago

podborski commented 2 years ago

I have a question. Where are track references of types adda and adrc defined? mp4ra points to 23003-4 but I can not find them there.

Also note that AMD1 of 23003-4 mentions those being defined in Part 12. But this seems not to be true as there are no definitions for those in clauses 6.x.x.

<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">

File Format payload FourCC Version Defined in ISO/IEC Defined in sub-clause Loudness Control profile Dynamic Range Control profile
Track reference for additional audio track adda n/a 14496-12 6.4.5 a a
Track reference for DRC metadata track adrc n/a 14496-12 6.1.1   b

In Part 12 adda is mentioned in clause 12.2.6 though. Is it considered to be defined in Part 12? If yes, we should probably add an entry in clause 8.3.3.3. And what about adrc?

podborski commented 2 years ago

Transferred to MPEGGroup

podborski commented 2 years ago

Found a few more issues. The following 4CCs are actually registered in DRC spec but are listed as Part12 at MP4RA. We should move them to DRC spec.