Flac - Mar 2007 - Encoding and Compression --- where is the nitpick?

Greetings,

I'm playing aroung with the library and try to encode some PCM samples
out of a WAVE file.

I recognized that my own encoding is bigger than the encoding with the
command line tool and I can't figure out why it is so. I tried some API
functions to get a better result but I missed.

minimal test code:
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/test.c

example wav:
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/test.wav

FLAC generated by the minimal test code:
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/a.flac

and the analysis file:
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/a.ana

FLAC generated by the command line tool:
$ flac test.w -o b.flac
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/b.flac

and the analysis file:
http://stinfwww.informatik.uni-leipzig.de/~mai02cal/b.ana

I think it may depend on the blocksize in both FLAC files (1152 vs 4096)
but I can't --- or better I'm not able --- to modify the blocksize with
FLAC__stream_encoder_set_blocksize().

I'm using the 1.1.4. How can I generate a better result (the same result
as the command line tool)? How can I maximize the compression ratio ---
what are the tricks?

Thank you
Matthias Berndt

PS: ... and thank you for the probably best archiving format for music.
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there are several compression settings that can affect this,
but for almost all cases it is best to just set an overall
compression level.  see the detailed description here for
encoder setup:

http://flac.sourceforge.net/api/group__flac__stream__encoder.html

Josh


--- Matthias Berndt <berndt.matthias@gmx.de> wrote:
> Greetings,
> 
> I'm playing aroung with the library and try to encode some PCM
> samples
> out of a WAVE file.
> 
> I recognized that my own encoding is bigger than the encoding with
> the
> command line tool and I can't figure out why it is so. I tried some
> API
> functions to get a better result but I missed.
> 
> minimal test code:
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/test.c
> 
> example wav:
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/test.wav
> 
> FLAC generated by the minimal test code:
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/a.flac
> 
> and the analysis file:
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/a.ana
> 
> FLAC generated by the command line tool:
> $ flac test.w -o b.flac
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/b.flac
> 
> and the analysis file:
> http://stinfwww.informatik.uni-leipzig.de/~mai02cal/b.ana
> 
> I think it may depend on the blocksize in both FLAC files (1152 vs
> 4096)
> but I can't --- or better I'm not able --- to modify the blocksize
> with
> FLAC__stream_encoder_set_blocksize().
> 
> I'm using the 1.1.4. How can I generate a better result (the same
> result
> as the command line tool)? How can I maximize the compression ratio
> ---
> what are the tricks?
> 
> Thank you
> Matthias Berndt
> 
> PS: ... and thank you for the probably best archiving format for
> music.
> > _______________________________________________
> Flac mailing list
> Flac@xiph.org
> http://lists.xiph.org/mailman/listinfo/flac
> 


 
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