[Mp4-tech] [Mpeg4 AAC] regarding PNS block in Mpeg4 AAC decoder

[Shreya Pathak]

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Hi,
In my reference Mpeg4 AAC LC decoder software, i am able to pass all the test vectors except PNS test vectors.The reference for me was the document for ISO.
Is there any change in PNS pseudo code given in the document ISO/IEC CD 14496-3 Subpart 4.
Regards
Shreya  
On Fri, 15 Oct 2023 Dave Singer wrote :
>At 5:41 PM +0530 10/14/04, Prashant Bhujang wrote:
>>Hi,
>>
>>I wanted some clarification on MP4 file format..
>>
>>Long back I had worked on mp4 file format, that was chapter 13 in 14496-1:2000. Now new standards like 14496-12(ISO media file format), 14496-14(MP4 file format) have been introduced.  I checked with the latest version of 14496-1. The chapter on file format is still retained.
>>I would like to know
>>1. If both the forms of file formats specified in 14496-1 and 14496-14 are supported.
>
>yes, though the new is preferred and supersedes the old.
>
>>2. What do brands 'mp41' and 'mp42' indicate?
>
>mp41 is the format documented in 14496-1 chapter 13, although that format didn't have an ftyp atom.
>
>>3. Can AVC data can be supported in the file format specified in 14496-1 (where in Atoms are used)
>
>yes, there is a part 15 which documents AVC in ISO family files. Since in its simple mode it uses no structural changes to the file format, it could be argued that it's compatible with the 14496-1 document.
>
>>
>>regards
>>Prashant
>>
>>--
>>Prashant Bhujang
>>Sasken Communication Technologies Ltd,
>>139/25, Amar Jyothi Layout, Domlur PO
>>Bangalore 560071
>>Tel: 25355501 Extn: 1124
>>email: prashant sasken.com
>>
>>
>>
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>
>
>-- David Singer
>Apple Computer/QuickTime
>_______________________________________________
>NOTE: Please use clear subject lines for your posts. Include [audio, [video], [systems], [general] or another apppropriate identifier to indicate the type of question you have.
>
>Note: Conduct on the mailing list is subject to the Antitrust guidelines found at http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php