lossyWAV 1.0.0 released., Added noise WAV bit reduction method. Options

[Nick.C]

lossyWAV 1.0.0b released:

CODE

lossyWAV 1.0.0b, Copyright © 2007,2008 Nick Currie. Copyleft.

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful,but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program.  If not, see <http://www.gnu.org/licenses/>.

Usage   : lossyWAV <input wav file> <options>

Example : lossyWAV musicfile.wav

Quality Options:

-q, --quality <n>   quality preset (10=highest quality, 0=lowest bitrate;
                    -q 5 is generally accepted to be transparent)
                    default=-q 5.

Standard Options:

-c, --check         check if WAV file has already been processed; default=off.
                    errorlevel=16 if already processed, 0 if not.
-C, --correction    write correction file for processed WAV file; default=off.
-f, --force         forcibly over-write output file if it exists; default=off.
-h, --help          display help.
-L, --longhelp      display extended help.
-M, --merge         merge existing lossy.wav and lwcdf.wav files.
-N, --noclips       set allowable number of clips / channel / codec block to 0;
                    default=3,3,3,3,2,1,0,0,0,0,0 (-q 0 to -q 10)
-o, --outdir <dir>  destination directory for the output file(s).
-v, --version       display the lossyWAV version number.

Special thanks:

David Robinson for the method itself and motivation to implement it.
Don Cross for the Complex-FFT algorithm used.
Horst Albrecht for valuable tuning input and feedback.

Explanation, history and lossless codec settings in the wiki article

[edit] 1.0.0b necessitated by unknown WAV chunk handling error and 24-bit --correction / --merge parameter error.

Link to GNU GPLv3+ source code for lossyWAV 1.0.0b [/edit]

N.B.: lossyWAV 1.1.0b released here.


This post has been edited by Nick.C: Mar 20 2009, 23:18

Attached File(s)

 lossyWAV_1.0.0b.zip ( 64.18K ) Number of downloads: 1895

 

[Balnes]

lossyWAV 1.0.0 released:

Usage : lossyWAV <input wav file> <options>

Example : lossyWAV musicfile.wav

Quality Options:

-q, --quality <n> quality preset (10=highest quality, 0=lowest bitrate;
-q 5 is generally accepted to be transparent)
default=-q 5.

Hello,
I guess this is a beginners question , but when I have a wave-file and use lossyWav.exe, I get an exact copy of the original Wave file. Is this correct?
I get no difference if I try "lossyWAV <input wav file> -q 0" or "lossyWAV <input wav file> -q 10" or just "lossyWAV <input wav file>". I always ends up with a new file with lossy.wav filetype, but the exact same file-size as the original.

Balnes

[Nick.C]

Hello,
I guess this is a beginners question , but when I have a wave-file and use lossyWav.exe, I get an exact copy of the original Wave file. Is this correct?
I get no difference if I try "lossyWAV <input wav file> -q 0" or "lossyWAV <input wav file> -q 10" or just "lossyWAV <input wav file>". I always ends up with a new file with lossy.wav filetype, but the exact same file-size as the original.

Balnes

It should not be exactly the same size, there is a 'fact' chunk inserted immediately after the 'fmt ' chunk, probably about 50 to 100 bytes long. The WAV file then requires to be encoded with a compatible lossless codec, e.g. FLAC, TAK, WavPack, taking care to set the block size to 512 samples (-b 512 in FLAC) and also to preserve WAV chunks (--keep-foreign-metadata in FLAC). When you compare the filesizes of the FLAC and the lossy.FLAC you should notice a difference.

[collector]

The WAV file then requires to be encoded with a compatible lossless codec, e.g. FLAC, TAK, WavPack, taking care to set the block size to 512 samples (-b 512 in FLAC) and also to preserve WAV chunks (--keep-foreign-metadata in FLAC).

Please explain why. A flac will be generated anyway. What are the risks when I don't keep that metadata ?

[Nick.C]

Please explain why. A flac will be generated anyway. What are the risks when I don't keep that metadata ?

If you don't keep the metadata, you lose the 'fact' chunk, which in turn will not prevent lossyWAV processing the file again.

[collector]

What are the risks when I don't keep that metadata ?

If you don't keep the metadata, you lose the 'fact' chunk, which in turn will not prevent lossyWAV processing the file again.

Thanks. So, sadly, that's another way to mislead people. Well, it's not your fault.