99% efficient lossless AVI compression!!

[flaninacupboard]

yes, i have found a way.
not directly relevant to everyone, but interesting nonetheless. compressing an AVI thats completely black or white gives above a 99% compression when zipped in winzip. try it. i experimented, and seemed to get an average compression ratio for 720X576 video of about 55%, useful if you need AVI's on your drive, but dont have space for them. also, anyone running drivespace or double space, will experience AVI's being about half their original size. maybe next gen storage devices will hold zipped 24bit AVI files.

[speedy]

Well of course! The whole idea of zip type compression schemes is to remove redundancy. So sure, if you have a 100% white or 100% black video you'll get huge compression. Now please them me why you think anyone cares.

[jeex]

hehehehe.

thats hillarious....

[flaninacupboard]

well, like i said, it's useful if you're captruing uncompressed AVI's, but need a bit of extra space on your HDD. i was only trying stimulate discussion.

[vitualis]

As as point of interest, using RAR with "multimedia compression" achieves much better compression ratio for images or video than ZIP.

Regards.

[G1r3D]

This thread is pretty useless... y?

This method is absurd... I'll quote a text from a friend...

That has to do with something called information theory and the "entropy". The entropy of the fast and evil is the "measure of disorder" or randomness in a data set.

Compressors usually work searching files or sets of symbols symbols to be repeated within a file to replace those symbols by "codes" equivalent. The decompression process does not, replace these codes by blocks representing and thus able to obtain the original file.

A text file where most characters are equally likely to appear can be compressed enough. A video file that has many almost random data is very difficult to compress.

An example. If I had a file that contains 1024 letters "A". Then to compress it might say "A repeat 1024".

Normal file:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Compressed file:

Repeat "A" 1024

Same thing happens with Video and Images... A blank image will use low space because it's only a lot of bits repeating...

[poisondeathray]

That's got to be a record for thread gravedigging

[G1r3D]

That's got to be a record for thread gravedigging

lmao, just trying to help, i came here tru google, didnt check dates

Holy shit! XD

[jman98]

That's got to be a record for thread gravedigging

lmao, just trying to help, i came here tru google, didnt check dates

Holy shit! XD

Yes, it probably is a record for graverobbing, but I'm sure some other new member will beat it soon enough. This is the first one I can remember where there has been over 10 years between posts.

[El Heggunte]

"Automatically Close Old Threads After X Days"

http://www.google.com/search?complete=0&hl=en&source=hp&q=%22Automatically+Close+Old+T...e+Search&gbv=2

Of course, Baldrick may think it's not worth implementing

[gll99]

I have a feeling this has been discussed before but a simple message showing the original thread start date with a note about grave digging if it's more than a year old should suffice. I'd hate see the option completely taken away unless it's connected to post count and/or signup date . IMO, it's best to let the mods deal with the few that get by and aren't relevant.

Anyway I feel bad bumping this any further.