[Mp4-tech] public AAC at 128kbps listening test open

[ejenn2000-mp4 yahoo.com]

Glad to see this is happening. However, I am sorry (and hate) to say that the result may not have any value because it is comparing apples with oranges. The average bitrate for Ahead/Nero AACenc (a VBR codec) to encode these test samples is as high as 141 kb/s!!!!! However, CBR codecs like iTunes and Real are only at 128 kb/s for all these test samples. Any experienced AAC developer will tell you that at this high bitrate 7-8 kb more will significantly improve the resulting sound quality. It would really be a surprise if iTunes or Real can beat Nero with such a lower bitrate. This is just not a test at 128 kb/s as the title called. It is comparing samples encoded at 141 kb/s and at 128 kb/s. I think the winner is obvious without going thru the test...
Jenn
> From: bond <b-o-n-d gmx.net>
> Date: February 18, 2024 1:11:29 PM PST
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] public AAC at 128kbps listening test open
>
> Hi!
>  
> Since there has been a lot of development in the AAC codec market in  
> the last months, Roberto Amorim kindly set up a listening test, open  
> for everyone to join, aiming at finding out what encoder performs best  
> AAC encoding at an average bitrate of 128kbps.
>  
> The used method of comparing codec quality is by performing so-called  
> "Double Blind Listening Tests". In this sort of test, the participant  
> compares various encoded samples against each other and against an  
> uncompressed reference sample. The blind part means that the  
> participant doesn't know which sample was encoded by which encoder.  
> That guarantees there'll be no psychological bias towards his/her  
> favorite codec, or against the codec he/she dislikes.
>
>  
>  
> The AAC at 128kbps listening test is now open. Everyone is invited to  
> participate!
>
> Instructions on how to participate are available at this page:
> http://www.rjamorim.com/test/aac128v2/presentation.html
>
> The test will run until February 28th, and may be extended if proven  
> necessary.
>  
>
> Results of already conducted listening tests can be found here:
> http://www.rjamorim.com/test/
>  
> enjoy

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