flac dev - Sep 2004 - Re: [Flac-users] Re: Settings to get the best compression

On Thu, Jun 12, 2003 at 09:04:40AM -0500, David W. Tamkin
wrote:
> Josh suggested to Chris:
> 
> >  flac --super-secret-totally-impractical-compression-level
> 
> Now it's not a secret any more!  (OK, to those who can read the code,
it
> never was.)
> 
> >No joke,
> 
> The existence of the option isn't, but its performance pretty much is, 
> as Josh admitted:
> 
> >... but you will soon find out that it is not worth it and will go
> >back to -8.  The -# options are already well tuned for CD audio.
> 
> No kidding.  I asked almost the identical question several months ago, 
> and a member here [whose name I am embarrassed to forget -- first name 
> might have been Miroslav?] suggested pretty much the same options as 
> those to which --super-secret-totally-impractical-compression-level 
> expands (just a different second value for -r). 
I just wanted to keep the secret. :)
> Many of the .wavs did 
> not compress as well as they had at plain old -8.  
I think it is caused by estimating (not very accurate) of rice bits.
This DONT_ESTIMATE_RICE_BITS define in stream_encoder caused problems
when i was playing with bonk residual coding, real results were
poor.

-- 
Miroslav Lichvar

--- Chris <cl@enposte.net> wrote:
> What are the settings that will give the absolute best compression?
> It doesn't have to stream, and encodeing speed is not a factor.
> I also don't care how long it will take to encode.
  flac --super-secret-totally-impractical-compression-level

No joke, but you will soon find out that it is not worth it
and will go back to -8.  The -# options are already well tuned
for CD audio.  If you are not encoding CD audio then reply
back with the resolution and sample rate and we can go over
it more.

Josh


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