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returntothepit >> discuss >> Compression questions for you computer geeks by niccolai on Sep 14,2006 12:12pm
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toggletoggle post by niccolai   at Sep 14,2006 12:12pm edited Sep 14,2006 12:15pm
I have a folder filled with AVIs of silent hill (I cut them into pieces). It's about a gigworth.

Mark Richards is going to crop the video files for me on his mac and send them back to me.

I want the folder to be able to upload and download as much as possible so I need alot of compression.

What should I compress it as? after I compress a 1024 gig file with a .zip, it's still a massive 1022 megabytes, so I'm probably not going to .zip it.

I have RAR, stuffit, Ace, 7zip, power archiver, and a few others



toggletoggle post by the_reverend   at Sep 14,2006 12:16pm
you will gain nothing out of zipping them or raring them.
or zipping and rarring.

if you know how cmpression on binary files works, you don't get more that 1-3%regularly.



toggletoggle post by niccolai   at Sep 14,2006 12:21pm
Well write me a perscription than Doctor Aaron, this isn't my field of knowledge at all.



toggletoggle post by the_reverend   at Sep 14,2006 12:41pm
what's do you mean "crop the video files"?
why don't you just do whatever it is that you are talking about??

the main way that compression algorithms work are chunking up a file into x bytes and then making a tree structure out of it.

say my file is contains
ABCCAAAZ
in a simple zip, I would take and count them up
A =4
C = 2
B = 1
Z = 1
I make a binary tree out of it. there are more A's so that is the first element
0/\1
A_/\1
_C_/\1
__B_/\1
___Z_/\1
I make some sort of info header for that tree. and then I compress the file so ABCCAAAZ (where each letter is 0-255 ASCII value)
HEX:414243434141415A
binary:0100000101000010010000110100001101000001010000010100000101011010
becomes
LRRLRLRLLLLLRRRL or in binary
011010100001110
HEX: 6A

in my little algorithm there, I took:
0100000101000010010000110100001101000001010000010100000101011010
and translated it into
<header>011010100001110



toggletoggle post by the_reverend   at Sep 14,2006 12:43pm
why doesn't this work in binary files? cause if you chunk off all the bytes, there is a wider range of bits patterns in the file. this means that the header will be huge and the tree will be huge, negating it's effectiveness.



toggletoggle post by niccolai   at Sep 14,2006 12:48pm
The video is wide screen and there's a small watermark on the border between the actual video and bottom black bar. it cuts into the video just a tiny bit, so I want to actually crop out the widescreen bars of the video.

I can't crop the video files with any video software I have an I'm not willing to pay a few hundred buts for something that can. I can't even find a program with a cropping feature to bootleg.

Even if I did have said program, I probly wouldn't be able to load more than a 20 minute AVI.



toggletoggle post by the_reverend   at Sep 14,2006 12:49pm
but mark can magically do this?
weird.



toggletoggle post by niccolai   at Sep 14,2006 12:50pm
the_reverend said:
I compress the file so ABCCAAAZ (where each letter is 0-255 ASCII value)
HEX:414243434141415A
binary:0100000101000010010000110100001101000001010000010100000101011010
becomes
LRRLRLRLLLLLRRRL or in binary
011010100001110
HEX: 6A

in my little algorithm there, I took:
0100000101000010010000110100001101000001010000010100000101011010
and translated it into
<header>011010100001110



....

You have entered the Matrix.



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