[Mp4-tech] Re: Doubt regarding MPEG4AAC

[lisa]

Hi Menno,
Could you u please tell me how to solve the accuracy problem in the
predictor code.
Is the accuracy problem coming on the quantization or
inverse quantization in the predictor?.
with regards
Lisa
On Tue, 7 Sep 2023 18:17:24 +0200, Menno Bakker <mbakker gmail.com> wrote:
> On Tue, 07 Sep 2023 17:36:58 +0200, Ralph Sperschneider
> <ralph.sperschneider iis.fraunhofer.de> wrote:
>> I am not familiar with faad. I even cannot see something special which  
>> applies
>> only to these sequences. The sequence was intended to test as many  
>> different
>> Huffman codewords from the spectrum Huffman codebooks as possible (that  
>> is
>> called "arithmetic torture" in ISO/IEC 14496-4). Maybe some seldom used  
>> Huffman
>> codes (eventually with some escape sequences) are not correctly decoded  
>> by the
>> faad ... just a guess.
>
> Issues with MAIN profile in faad2 are known. It has to do with some
> accuracy problems in the predictor code.
> The arithmetic torture test is no problem for faad2.
>
> Menno
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