Yeah, a folder full of mp3 files isn't going to compress much. The xls
files will compress a lot but they probably take up very little space.
Different compression algorithms work better on different kinds of
data. What a tool can do is look at each file and dtermine which
algorithm to use to compress it. 7-zip might do a better job of that
than regular zip. But probably to really do a valid test you'd have to
tell zip to do it's best compression with the -9 command line option.
I predict that neither will do much with a folder full of mp3 files though.
On 03/26/2015 11:04 AM, Joe Quinn wrote:
Rats cause what I wanna compress is MP3 and off/XLS files in the same folder
Sent from my iPhone
On Mar 26, 2015, at 10:26 AM, 'Chris Blouch' via MacVisionaries
<macvisionaries@googlegroups.com> wrote:
I compressed my copy of Keynote, which is really made up of thousands of files
under the hood totaling 611,951,069 bytes (692.5 MB). To test unix compress I
did
tar -zcvf test.gz /Applications/Keynote.app/
which generated a compressed file of 428,440,218 bytes (428.4MB) or about 61.9%
of the original file size. Doing the same thing through the finder I selected
Keynote and then chose Compress from the File menu. That generated a zip file
of 453,379,578 butes (453.4 MB) or 65.5%. Just for the fun of it I also tried
doing a 7-Zip. Downloaded a 7-Zip app for OSX from here:
http://www.updatestar.com/directdownload/7zx/2188433
which generated a .7z file of 375,098,819 bytes (375.1MB) or about 54%. So it
looks like 7-zip is the smallest (11% smaller than plain zip in my test) but
the downside is that it's not very popular. If you send this to someone else
they will have to go through the bother of finding, downloading and installing
an app to uncompressed it. Pretty much everyone can handle a zip file without
much trouble.
As with all compression, the results are also based on what you are
compressing. Text, which has lots of repeating patterns, compresses really
well. Binary files such as audio, video and images might not compress at all.
CB
On 3/25/15 7:38 PM, Joe Quinn wrote:
now that SArchiver’s gone down the tubes? what’s the best archiving utility for
the mac? i wanna be able to compress files as small as humanly possible, but
still retain quality. thanks for any info!
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