[flac-dev] Higher compression modes from Flake

[Pierre-Yves Thoulon]

Speaking of better compression, I've been using the following options on
the command line for ages. I'm not sure what they actually do (stole the
recipe from a thread on this mailing list, if I remember right), but they
seem to improve the compression ratio over just using --best (by 0.3 to
0.5% typically), without any obvious impact on the compression time (not
that I measured that scientifically, mind you...)

--apodization=tukey(0.25) --apodization=gauss(0.1875)

Any one who would care to comment on what this does ?

Thanks,
Pyt.


On Thu, Mar 14, 2013 at 3:06 AM, Ben Allison <benski at winamp.com> wrote:

> Flake is a completely independent codebase.  When I used it years ago, I
> remember it being not only better compression but significantly faster as
> well.  I believe some of the techniques used in libflake were added to
> libFLAC in 1.1.4.  However, some of the improved compression in flake was
> due to options that are outside the FLAC 'subset', such as larger
> blocksize, greater number of prediction coefficients, and higher-order
> Rice codes.
>
> -Ben Allison
>
> > Are you sure that the encoding library was improved, or just the
> > command line?
> >
> > Keep in mind that 1-8 (or 0-8) are just macros for particular
> > combinations of options that are also available separately.
> >
> > I'm just guessing, here, but 9-12 might be nothing more than selected
> > combinations of options that are already available in the official
> > flac command-line, albeit without a short, numerical abbreviation.
> >
> > Brian Willoughby
> > Sound Consulting
>
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