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Questions with Compression

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Post #1 · Posted at 2010-11-25 12:54:30am 3.9 years ago

Offline mageman17
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I have discovered the powers of 7-zip and witnessed its wrath as it compressed a folder (6 GB to 5.5 Gb or something like that on ultra settings). Can I do the same to video files (compressed as Ultra and is a Solid archive) and expect a noticeable drop in the size or the archived file or am I just wasting my time?


https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/v/1062382_10201572769465595_128160513_n.jpg?oh=9754e27f3e3abfc87705f8fbb04171b7&oe=51EF2FCF&__gda__=1374640178_2eb448a145b3702ac93532ea3195d6c3

Post #2 · Posted at 2010-11-25 12:58:16am 3.9 years ago

Offline Daiz
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Depends. Stuff that's already compressed do not recompress very well. This includes media files that use a codec for compression (.mp3, .avi's that use codecs, etc) I have taken raw .avi files and put compressed them into .rar files and gotten huge reductions (150MB -> 10MB). Unfortunately, it comes with the drawback of taking forever to decompress.

Post #3 · Posted at 2010-11-25 01:07:08am 3.9 years ago

Offline mageman17
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I actually can live with the long decompression time since they'll be put in another storage device and won't likely be accessed in a while. And what I was planning to compress were .avi files too. I haven't done a first hand test since I don't have winRAR installed in my system.

But I guess this also answers the belief that zipping/rarring a zip/rar archive does not save space.
https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-prn2/v/1062382_10201572769465595_128160513_n.jpg?oh=9754e27f3e3abfc87705f8fbb04171b7&oe=51EF2FCF&__gda__=1374640178_2eb448a145b3702ac93532ea3195d6c3
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