[FFmpeg-user] tiny_psnr typical PSNR values

[Takis Issaris]

Hi Roger,

----- Original Message -----
> From: Roger Pack <rogerdpack2 at gmail.com>
> To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
> Cc: 
> Sent: Thursday, August 23, 2012 7:39 PM
> Subject: Re: [FFmpeg-user] tiny_psnr typical PSNR values
> 
>>  A colleague asked me for some tips on how to compare the quality of audio 
> streams which have been subjected to errors due to network problems. I suggested 
> using the tiny_psnr tool to compute the PSNR. On the ffmpeg-user maillinglist I 
> noticed an e-mail by Benjamin indicating that a PSNR above 80dB would indicate 
> acceptable quality for some codecs being introducing into FFmpeg. The values 
> I'm getting are _much_ lower though (in the range of 20 to 30 dB). I tried 
> using both the files with WAV headers and files containing just the samples to 
> be sure it wasn't a header problem.
> 
> So your question is if the 80dB indicated is really acceptable/good quality?
> -r


No, the question is: If 80dB would be the acceptable quality limit, why are the existing codecs showing 20 to 30dB using tiny_psnr?

With friendly regards,
Takis