Compressing file sizes

[memurt]

Does any body know of any (free) software to compress files. I need to compress video files to limit the amount of space im using on my memory card. (For my PSP) Many thanks in advance...

[ACtheTROLL]

no can do
media files tend to be already compressed so you are on a looser.

you could resample with something like http://www.alloksoft.com/

but smalled means less detail ... so it will be trial and error