[FFmpeg-devel] [PATCH] Common ACELP code & G.729 [4/7] - G.729 core

Michael Niedermayer michaelni
Fri Oct 17 23:04:07 CEST 2008

On Fri, Oct 17, 2008 at 11:57:26AM +0200, Benjamin Larsson wrote:
> Michael Niedermayer wrote:
> >> 4400 mode is (i assume) Chinese extension of G.729. it is not covered
> >> by official specification.
> >> And since i have no samples i can't test it. This is why i put those comment.
> >>     
> >
> > What makes you think this format even exists?
> > Is there any source code for a decoder?
> > Or a specification?
> > Or is it mentioned in any manual for any hardware?
> > Iam just a little curious where this stuff comes from ...
> >
> >   
> This comes from Chinese portable media players capable of recording .act 
> files(the same players are most likely also able to play .amv files), 
> the only thing that can play these kind of files is a windows application.
> http://wiki.multimedia.cx/index.php?title=ACT

well, thats just our wiki ...
i was more interrested in the source of these claims.

We do not have a single 4k4 file and we have just a binary decoder that
may (or may not) support such files.
we dont even have a manual that claims that such files are supported or
even exist ...

Or to say it differently, what evidence is there that this 4400 mode is
not just a typo in some chinese - english translation of some manual?


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If a bugfix only changes things apparently unrelated to the bug with no
further explanation, that is a good sign that the bugfix is wrong.
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