[Mp4-tech] [Mpeg4 ] [AAC] + mismatch in decoder o/p compared to standard

[Shreya Pathak]

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  Hi,
    I have developed a reference code for Mpeg4 AAC and the decoded output values when compared with the test vectors there is a mismatch of +/- 1.
i.e, the pcm output values from my reference decoder(floating point code only)
will be 1 more or less than the pcm values of standard test vectors.The difference does not exceed 1. I am not getting what the problem is ? If i compare publicly available code faad from Nero with the standard test vectors, its also not matching with standard test vectors bit by bit and so i am not able to debug where there is an error in my reference code.
                    Can u please tell me where I may be wrong ?
Regards
Shreya
On Mon, 11 Oct 2023 Tobias Oelbaum wrote :
>Forwarding a mail from one of my students
>
>Dear experts,
>
>for any of you working with linux/unix/OsX or you just want to test on
>different implementations - here are some tools you may be interested in.
>
>Imagemagick can convert images or series of images to raw yuv (video) files.
>Syntax: convert x.jpg x.yuv
>http://www.imagemagick.org/
>
>Mplayer can play raw yuv video files.
>Syntax: mplayer -rawvideo on:pal:fps=25 x.yuv
>(http://www.mplayerhq.hu/)
>
>FFMPEG in it's newest version (0.4.9_pre1) can play H.264 files - has CABAC
>but no B-picture support.
>Syntax: ffplay -f h264 x.264
>(http://ffmpeg.sourceforge.net/)
>
>I found them extremely helpful for my work with the reference
>encoder/decoder
>and wanted to contribute.
>
>Regards
>
>Dominic Buchstaller
>Technical University of Munich (TUM) - Germany
>
>P.S.: There should be windows versions for all programs as well.
>
>--------------------------------------------------------------------
>Dipl. Ing. Tobias Oelbaum
>Institute for Data Processing       Lehrstuhl für Datenverarbeitung
>Munich University of Technology     Technische Universität München
>
>EMail: oelbaum tum.de
>Tel:   +49 89 289 23625
>Fax:   +49 89 289 23600
>--------------------------------------------------------------------
>
>
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