[opus] ODG (Objective Difference Grade) scores for Opus Encoder using PQEvalAudio Tool

[Christian Hoene]

 <http://www.itu.int/rec/R-REC-BS.1387/en> ITU-R Recommendation BS.1387:
Method for objective measurements of perceived audio quality (PEAQ)

 

 

 

Von: Rhishikesh Agashe [mailto:Rhishikesh.Agashe at imgtec.com] 
Gesendet: Freitag, 4. Oktober 2013 14:02
An: Christian Hoene; opus at xiph.org
Cc: Rasmi Mishra
Betreff: RE: [opus] ODG (Objective Difference Grade) scores for Opus Encoder
using PQEvalAudio Tool

 

In that case, can you please suggest a reliable tool?

 

Thanks,

Rhishi

 

 

From: Christian Hoene [mailto:christian.hoene at symonics.com] 
Sent: Friday, October 04, 2013 17:30
To: Rhishikesh Agashe; opus at xiph.org
Cc: Rasmi Mishra
Subject: AW: [opus] ODG (Objective Difference Grade) scores for Opus Encoder
using PQEvalAudio Tool

 

Hi Rhishi,

 

PQevalaudio is very unreliable and buggy. I have compared to PEAQ and - as a
result - now I am not using it anymore. 

 

With best regards,

 

Christian Hoene

 

 

Von: opus-bounces at xiph.org [mailto:opus-bounces at xiph.org] Im Auftrag von
Rhishikesh Agashe
Gesendet: Freitag, 4. Oktober 2013 12:35
An: opus at xiph.org
Cc: Rasmi Mishra
Betreff: [opus] ODG (Objective Difference Grade) scores for Opus Encoder
using PQEvalAudio Tool

 

Hi,

 

I checked the ODG (Objective Difference Grade) scores for a few reference
vectors using the PQEvalAudio Tool and found that some of them show ODG
scores as high as -3.5

 

If we look at the range as described in the link below, it looks
unacceptable.

http://www-mmsp.ece.mcgill.ca/documents/Software/Packages/AFsp/PQevalAudio.h
tml

 

Am I missing something or are these scores valid?

 

Thanks and Regards,

Rhishi

 

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