I’m sure you are all right, but there wasn’t any problems like these when I was using Windows XP and 2GB RAM was totally enough for me/for rendering. I used to make my videos by this way.
Always I was rendering to “Windows Video” and it was very big for me, then I was compressing the video with “Virtual Dub” to XviD MPEG-4 Codec AVI then I was counting it as a compressed video. But I didn’t know that Windows Video format is a really high-compressed format because it is nearly 20 GB for 4 minutes of video.
Anyway, thanks for the help. But all I couldn’t understand is you said that AE CS4 can’t render MPEG4 codec footage but when was using Windows XP I was only working with them and rendering without no problem…