[FFmpeg-devel] [PATCH] QCELP postfilter

Michael Niedermayer michaelni
Wed Apr 7 02:08:17 CEST 2010

On Tue, Apr 06, 2010 at 03:36:28PM -0400, Ronald S. Bultje wrote:
> Hi,
> On Mon, Apr 5, 2010 at 6:10 PM, Ronald S. Bultje <rsbultje at gmail.com> wrote:
> > On Thu, Apr 1, 2010 at 4:41 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> >> that should be ok, and i volunteer as one of the test subjects, where
> >> can i download the .wav files? and of course it would be great to have
> >> original pre encoder waves to for reference
> >
> > I'll try to do this tomorrow, sorry for being so slow.
> http://people.gnome.org/~rbultje/ff/
> I chose a reasonable-quality source file (.mov), hoping that'll make
> the testing easier and more pleasant. If you need an additional
> poor-quality one, let me know and I'll add it (same numbering). The 7
> files are (in no particular order):
> - Reference code with or without postfilter (2)
> - FFmpeg decoder without postfilter (1)
> - FFmpeg decoder with Reference postfilter (1)
> - FFmpeg decoder with Reference converted into our postfilter in 3 steps (3)
> I'd be very pleased if you could test blindly and tell me which you
> like best. Vitor, could you test also?

they all sound like shit, maybe 2.wav is amogth the better but its shit as
It would be easier to compare fewer files, 7 is too many.
You should think about what question you want to awnser and make a
test for that, not just dump 7 files onto testers
and hope the result could somehow be usefull for something

also as this is not a reference sample and not a sample you encoded
Id like to at least have the output of the official qt decoder as well.
And as said, the encoder input is needed without this its just not
possible to know how its supposed to sound.


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

> ... defining _GNU_SOURCE...
For the love of all that is holy, and some that is not, don't do that.
-- Luca & Mans
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