BLFS Bugzilla #1690

Steffen R. Knollmann sknolli at astro.physik.uni-goettingen.de
Thu Nov 17 10:01:30 PST 2005


On Thu, Nov 17, 2005 at 06:29:26PM +0100, Steffen R. Knollmann wrote:
>   Oh, okay. Now. Sorry, my fault. The files are not corrupt, they are
> still valid ogg-files (as in: can be readily played). The content
> though is faulty and will sound really bad and even have higher
> bitrates than it is supposed to have.
> 
>   This is something that might go unnoticed if the quality setting is
> high (target bitrate of 256kB/s or so). I will try that.

  So I made a couple of runs on the same wav ("Stream of Passion -
Spellbound"):

  quality setting  nominal bitrate    bitrate faulty    bitrate correct
         2             96 kB/s       131,068259 kb/s    94,005275 kb/s
         4            128 kB/s       156,445113 kb/s   126,269563 kb/s
         6            192 kB/s       295,187676 kb/s   187,735141 kb/s
         8            256 kB/s       390,066274 kb/s   253,991523 kb/s
        10         499,821000 kb/s   539,641787 kb/s   469,760050 kb/s

  The bitrate values are the ones given when running ogginfo on the
files.

  The worse quality is audible in all files but you might not spot them
in the -q 10 (and maybe -q 8) settings if you are not explicitly
listening for them.

  To really hear what I mean with worse quality compare the files in
quality setting 2. This should really be a huge difference. Or even
compare the faulty -q 2 setting with the correct -q 4 setting which have
approximately the same bitrate.


  Cheers,
    Steffen

-- 
Grau, teurer Freund, ist alle Theorie,
Und grün des Lebens goldner Baum.
  -- Goethe, Faust



More information about the blfs-dev mailing list