mmm, en effet c'est sur qu'il y a des wrappers dans la lib32.
C'est probablement 5 lignes dans toutes les libs 
carly, je probleme n'est pas tant lie a la lib qu'au fait que OP est debuttant.
(ca fait des annees que je n'ai plus lu fr.comp.os.ms-windows.programmation . comment se porte le newsgroup ? )
Ratha, tu as deja compile la lib ?
mmm, je viens de parcourir la faq de ffmpeg et on trouve ceci dedans qui me fait dire que ffmpeg n'est pas compilable avec visual C++. il est peut etre plus simple d'utiliser la lib32 comme suggerer par carly.
Is Microsoft Visual C++ supported?
No. Microsoft Visual C++ is not compliant to the C99 standard and does
not - among other things - support the inline assembly used in FFmpeg.
If you wish to use MSVC++ for your
project then you can link the MSVC++ code with libav* as long as
you compile the latter with a working C compiler. For more information, see
the @emph{Microsoft Visual C++ compatibility} section in the FFmpeg
documentation.
There have been efforts to make FFmpeg compatible with MSVC++ in the
past. However, they have all been rejected as too intrusive, especially
since MinGW does the job adequately. None of the core developers
work with MSVC++ and thus this item is low priority. Should you find
the silver bullet that solves this problem, feel free to shoot it at us.
We strongly recommend you to move over from MSVC++ to MinGW tools.