i have .avi files that were encoded on a PC. i can view them in quicktime using the 3ivx plugin. but, it is incredibly slow. I have quicktime pro and can convert to another format. i tried "video" on medium quality, and it looks about the same quality wise. it is much easier to use in quicktime. i just picked this settign out of the blue. My question is, which setting should i use for ease of use and keep about the same quality? how do i know whatthe original was encoded at? Also, do i need to covert to DV to use in imovie? if so, what setting do i use there? if i use full quality, i seems like i'm using a ton of space for no improvement in quality. one .avi that i converted went from 104 to 450 megs. any help would be appreciated.