[vorbis] Different average bitrates on different machines

[John Denton]

As a matter of interest:

The same short test wav encoded using copies of same OggEnc copied between
machines.

1. OggEnc  compiled from the CVS (downloaded a couple or three weeks ago -
fixed at target 128 kbps) from a GUI wrapper
('reports' refers to the return on completion of OggEnc):

Athlon 1200 Win98SE - reports
     File length:  0m 20.0s
     Elapsed time: 0m 09.0s
     Rate:         2.2695
     Average bitrate: 122.6 kb/s
Athlon 1200 Win2000Pro - reports
     File length:  0m 20.0s
     Elapsed time: 0m 04.0s
     Rate:         5.1064
     Average bitrate: 122.6 kb/s
Pentium II 350 WinME - reports
     File length:  0m 20.0s
     Elapsed time: 0m 30.0s
     Rate:         0.6809
     Average bitrate: 122.6 kb/s
AMD 350 Win98 - reports
     File length:  0m 20.0s
     Elapsed time: 1m 03.0s
     Rate:         0.3242
     Average bitrate: 122.6 kb/s

Using OggEnc downloaded with the SDK (variable bitrate) at target -b400
Athlon 1200 Win98SE - reports
     File length:  0m 20.0s
     Elapsed time: 0m 10.0s
     Rate:         2.0426
     Average bitrate: 264.7 kb/s
Athlon 1200 Win2000Pro - reports
     File length:  0m 20.0s
     Elapsed time: 0m 04.0s
     Rate:         5.1064
     Average bitrate: 264.7 kb/s
Pentium II 350 WinME - reports
     File length:  0m 20.0s
     Elapsed time: 0m 32.0s
     Rate:         0.6383
     Average bitrate: 264.7 kb/s
AMD 350 Win98 - reports
     File length:  0m 20.0s
     Elapsed time: 1m 09.0s
     Rate:         0.2960
     Average bitrate: 264.7 kb/s

Really must move my encoding to 2000 Pro!

<p><p>J.

----- Original Message -----
From: "Giuliano Pochini" <pochini at shiny.it>
To: "Bruce D" <aythos at hotmail.com>
Cc: <vorbis at xiph.org>
Sent: Monday, December 10, 2001 9:14 AM
Subject: RE: [vorbis] Different average bitrates on different machines

<p>>
> > I am using OggEnc v0.8 (libvorbis rc2)   (win32 cli)
> >
> > I have access to two machines
> >       Pentium 3 450mhz, 192mb, Windows 2000 (SP2)
> >       Athlon 1400mhz, 256mb, Windows 2000 (SP2)
> >
> > When I encode the same wave file on each machine at the same nominal
> > bitrate (96kbps), I get output files with different average bitrates.
> > 107kbps on the Athlon, as opposed to 84kbps on the Pentium 3.
>
> Put a (small) peice of that file that shows the
> problem somewhere so we can try ourselves.
>
> > Anyone experienced this ? Is this to be expected?
> >
> > Just a little curious
>
> I have a ppc750 and I'm curious too.
>
>
> Bye.
>     Giuliano Pochini ->)|(<- Shiny Network {AS6665} ->)|(<-
>
>
> --- >8 ----
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<p><p>--- >8 ----
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