[FFmpeg-devel] [PATCH] QCELP postfilter

Michael Niedermayer michaelni
Tue Apr 13 20:31:50 CEST 2010

On Tue, Apr 13, 2010 at 01:59:49PM -0400, Ronald S. Bultje wrote:
> Hi,
> On Tue, Apr 13, 2010 at 12:59 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> > On Tue, Apr 13, 2010 at 12:51:26PM -0400, Ronald S. Bultje wrote:
> >> On Tue, Apr 13, 2010 at 12:45 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> >> > the flac is 2channel 44khz, the others are 1channel 8khz
> >>
> >> Well of course, voice codecs are always 8kHz (or around there). The
> >> Qualcomm software converted it (without asking me).
> >
> > but that means we have no reference again
> > i can surely downconvert it to 8khz but thats not what was encoded...
> I see that's sub-ideal, but I don't know how to fix it. The Qualcomm
> encoder does all of this in one single step ("convert", which converts
> to 8kHz, 1 channel, QCELP from any WAVE file)...

you just use 8khz 1channel wave as input, not something that cant be
encoded. and you provide this input as reference

> Maybe I should try Quicktime Pro instead?

a sample from another encoder is a good idea too

> But then again, what are we
> trying to show here? Do we really need the intermediate resampled
> file?

as is i can say that 1.wav contains static clicking
and there are significant differences between 2 and 3, just put 2 on
the left channel and 3 on the right and listen with headphones you
wont miss that they dont match.
Now if i had the original i could try to listen to original left and
2 right and then repeat this with original left and 3 right.


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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