[Vorbis-dev] Probleme with bitrate when encoding small files

[Jean-Francois Guay]

Just an update on our problem as other people may encounter the same problem.  We tried the proposed patch, we even tried to integrate the most recent version (1.2) without success.  So we tried to compile a small example included with the source code and we where not able to reproduce the problem.  We found that to be able to reproduce the problem we had to compile the source code as C++ (in our implementation we changed the oggvorbis allocator for our own allocator that are in the form of a C++ object)

So converting back all oggvorbis code to be compiled as C corrected the problem.  So it's seem that Microsoft VC8 has not the same behaviour as VC71 when compiling in C++.

--
JF



-----Original Message-----
From: Ralph Giles [mailto:giles at xiph.org] 
Sent: 7 août 2007 13:24
To: Jean-Francois Guay
Cc: vorbis-dev at xiph.org
Subject: Re: [Vorbis-dev] Probleme with bitrate when encoding small files

On Tue, Aug 07, 2007 at 01:22:45PM -0400, Jean-Francois Guay wrote:

> >From what we have found to date it's look like it's related to rounding
> error from float to int conversion but it's just an impression we have
> not pin pointed the exact problem. We tried out different compilation
> option on VC8 to reproduce the behaviour of VC71, but without success.

I don't know if it's the same issue, but we had a similar problem with 
vorbis 1.1 and gcc 4.x. You might try the patch to scales.h in

  https://trac.xiph.org/changeset/9959

And see if that resolves the problem.

 -r