[Vorbis] Big quality loss with self-compiled Vorbis-lib under LFS

[Michael Smith]

On 10/11/05, lynx.abraxas at freenet.de <lynx.abraxas at freenet.de> wrote:
> Hallo altogether!
>
>
> First of all I want to thank the developers for the great codec!
> But I have the following problem now:
>
> I  have  built  my  own  Linux from Scratch and also compiled everything that is
> necessary to have ogg and vorbis and  tools  for  de-  and  encoding.  Just  the
> encoding  turned  out  to  have very poor quality independent how high I set the
> quality level. It has some kind of echo in it and is like phone quality.
> I compiled the whole thing also under my SuSE and there it works perfectly. When
> I  copy  my  self-compiled libvorbis.so.0.3.0 from SuSE to my LFS it works fine.
> But I don't like that and am wondering, what is wrong  with  my  LFS-library.  I
> noticed as well, that, although it is both the newest version, my LFS oggenc has
> a much, much fast running progress-indicator (actually it is hard to be seen  at
> all!) and has a much higher average bitrate for one and the same wav-file as the
> SuSE-lib yields.
> Has anybody an idea? I have no clue where to start serching for a fault as there
> is  never  any  error-message  in  any stage. What is the newest gcc the library
> should be compiled with? I used gcc-3.3.6 and 4.0.0.

A serious bug was provoked by gcc 4.x compilers, though that's been
fixed in svn (have we done a release since then?).

So use the SVN version, or don't use gcc4. If that's not the problem,
it's difficult to guess - presumably, since you're using LFS, you'll
be able to debug this yourself, and give us at least some idea what
sort of thing is going wrong.

Mike