I am now in the process of moving from ALAC to FLAC. i did lots of reading about command options and what i am looking for is best compression time is less of an issue, i did saw in later posts the use of -A "tukey(0,5)" options, but it is beyond me to understand its function, can you please clarify it for me? any other options i should use beyond the obvious -8 ?
Full Version: -A option
QUOTE(brb @ Feb 15 2007, 20:40) 
i did saw in later posts the use of -A "tukey(0,5)" options, but it is beyond me to understand its function, can you please clarify it for me? any other options i should use beyond the obvious -8 ?
The "tukey(0,5)" was to correct a bug in FLAC 1.1.3 release. For the latest release you should use the "--best" option to achieve the maximum compression ratio.
The -A option is described in detail here:
http://flac.sourceforge.net/documentation_...ons_apodization
Basically it is an attempt to compress subframes with the user supplied function, in this case the function would be "tukey(0,5)". You can specify as many as you like but for each function that you add it makes the encoding time increase. That's about as much as I understand of it, if I understand it correctly.
I would suggest that you just follow Egor's advice and just use "-8" or "--best" for maximum compression and not worry about anything else.
http://flac.sourceforge.net/documentation_...ons_apodization
Basically it is an attempt to compress subframes with the user supplied function, in this case the function would be "tukey(0,5)". You can specify as many as you like but for each function that you add it makes the encoding time increase. That's about as much as I understand of it, if I understand it correctly.
I would suggest that you just follow Egor's advice and just use "-8" or "--best" for maximum compression and not worry about anything else.
Agreed. Zoom has explained it well.
The extra time required to encode is not really worth the effort. Here is a very small comparison (there are probably others in the thread). Note that -8 (or --best) is using -A tukey(0.5) and -8 -Ax2, as stated in the post, is using -A tukey(0.5) -A flattop. The more windows you add the slower the encode and the less the benefit. Josh took a lot of data to come up with -A tukey(0.5) as the default, and it works very well in most situations.
The extra time required to encode is not really worth the effort. Here is a very small comparison (there are probably others in the thread). Note that -8 (or --best) is using -A tukey(0.5) and -8 -Ax2, as stated in the post, is using -A tukey(0.5) -A flattop. The more windows you add the slower the encode and the less the benefit. Josh took a lot of data to come up with -A tukey(0.5) as the default, and it works very well in most situations.
Thanks for your help guys --best it is.
I found the following script here on the forums for recoding FLAC files:
This was made for version 1.1.3. Should I change something here for the newest version? Should -8 be replaced with --best? Should I remove -A "tukey(0,5)"?
CODE
@echo off
set encoder="C:\Program Files\FLAC\flac.exe"
for /r "." %%d in (.) do (cd %%d & for %%f in (*.flac) do %encoder% -8 -V -f -A "tukey(0,5)" "%%f")
set encoder="C:\Program Files\FLAC\flac.exe"
for /r "." %%d in (.) do (cd %%d & for %%f in (*.flac) do %encoder% -8 -V -f -A "tukey(0,5)" "%%f")
This was made for version 1.1.3. Should I change something here for the newest version? Should -8 be replaced with --best? Should I remove -A "tukey(0,5)"?
I'll try to get more detailed information on that as soon as possible.
QUOTE(MiSP @ Sep 22 2007, 14:12)
I found the following script here on the forums for recoding FLAC files:[...]
This was made for version 1.1.3. Should I change something here for the newest version? Should -8be replaced with --best? Should I remove -A "tukey(0,5)"?
This was made for version 1.1.3. Should I change something here for the newest version? Should -8be replaced with --best? Should I remove -A "tukey(0,5)"?
Yes, remove the -A "tukey(0,5)" part.
The --best option is mapped to -8 currently (so there is no compression ratio improvement for the current 1.2.1 version).
QUOTE(Egor @ Sep 22 2007, 09:22)
Yes, remove the -A "tukey(0,5)" part.
The --best option is mapped to -8 currently (so there is no compression ratio improvement for the current 1.2.1 version).
Thanks.
I'll use the --best option, because I'm sure the intention is that it's being remapped to the best compression should there ever be better compression rates.
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