[Ffmpeg-devel] bug in decoding of WMA V2 files

[François Revol]

> Benjamin Larsson <banan at student.luth.se> wrote:
> 
> >this is a known bug that has been in the decoder since it was added 
> > to 
> >ffmpeg. Nobody seams to be able to fix it either.
> 
> Thanks for the prompt reply.
> I took a deeper look at the problem, and I have reached the
> point where it would really be useful to have some kind of
> specification to refer to.  I would like to at least isolate the
> problematic frames so that someone would be able to
> "debug" Windows Media Player (I mean, understand why it does
> not behave like mplayer on these frames :) ).
> 
> http://www.wotsit.org/ does not have anything about WMA.
> Does anyone know where to find documents about WMA?

WMA is a crapy, ugly, patent-encumbered, proprietary format.
Why on earth would you be able to find specs for that ? :)

> What source of information was the implementation of the
> ffmpeg decoder based on?

Reverse Engineering.

Fran?ois.